Harry Efstathiadis

Harry Efstathiadis

Ph.D.
Harry Efstathiadis
Associate Professor of Nanoengineering

Contact

Phone Number:
518-437-8605
Office Address:
NFE
4318
Location
Albany
Faculty/Staff
Faculty
Department
Nanoengineering
College
College of Nanoscale Science + Engineering

Professional Background

  • Ph.D. (Experimental Condensed-Matter Physics) 1997, City University of New York
  • M.S. (Physics) 1991, City College of New York

Areas of Research

  • Photovoltaics (CuInGaSe2 (CIGS), a-Si, p-Si, Perovskites)
  • Li-ion batteries (Liquid and solid electrolytes)
  • Sensors - Anti-reflective coatings
  • Solid-State air filter for face masks
  • Thin film deposition and characterization

Research Description

Professor Efstathiadis' research is focused on the following areas:

Thin-film solar cells
CIGS
This project includes the development of chemical (using CIGS nanoparticles) and sputter (bi-layer, co-sputtering) deposition processes for the absorber layer, low-cost methods for selenization and sulfurization, and studies of flexible substrates, barrier, and alternative to CdS buffer layers. The project also involves photovoltaic (PV) device fabrication and testing.

a-Si and nc-Si
This project is focused on process development for thin-film a-Si and p-Si by evaporation and high frequency Plasma Enhanced Chemical Vapor Deposition (PECVD) and anti-reflection and passivation coatings, front contact metallization for PV devices.

Li-ion batteries
In a Li-ion battery a solid electrolyte interphase (SEI) is formed on a graphitic anode surface during the first electrochemical cycle. In this project several formation methods in full Li-ion cells are investigated to study their impact on Li distribution at the anode interface. To evaluate the impact of formation both on performance and at a physical level, full cells were assembled, formed and cycled at various rates then disassembled and the electrodes were measured using the non-destructive Li nuclear reaction analysis (Li-NRA) measurements. Probing the immobile Li as a consequence of formation procedure and cycling can provide insight into charge transfer and cycle life limitations.

Li-ion Batteries - Solid Electrolytes
This project is focused on the development by RF-magnetron sputtering and characterization of different classes of solid lithium-ionic conductors, fabrication of all-solid state microbatteries using photo lithography, and electrochemical evaluation testing. One promising compound is lithium aluminum titanium phosphate (LATP), a NASICON-like solid electrolyte whose chemical compound follows the structure Li1+xAlxTi2-x(PO4)3.

Sensors - Anti-reflective coatings
Infrared sensors are being developed for a variety of defense and commercial systems applications. Oblique-angle deposition has been used to tailor the refractive index of porous, nanostructured SiO2 materials, and to build high-performance step-graded refractive index structures on glass and other relevant substrates. Step-grade designs enable the formation of AR structures that combine broadband and omnidirectional characteristics. In this work, we will develop on large areas the oblique angle deposition process of nanostructured coating technology for IR sensing applications and report results from step-graded antireflection coatings on silicon substrates

Solid-State air filter for face masks
The aim of this project is to fabricate using photolithography and test an all solid electrostatic air filter that can be integrated with commercially available respirators and face masks for personnel protection from viruses including COVID19. The filtration device is mechanically robust, reusable for hundreds or thousands of times after simple cleaning, and kills all biological agents irrespective of size.

Thin film deposition and characterization
Low pressure thermal and plasma enhanced chemical vapor film depositions of silicon and carbon based alloys for hard coating and antireflective coatings for IR-windows.

Awards

Materials Research Society - Finalist at the MRS Entrepreneurship Challenge, San Francisco, CA (2006).

Publications

  1. M. S. Islam, M T. Islam, S. Sarker, S. S. Nishat; M. R. Jani, A. Rauf, H. Al Jame, S. Ahsan, K. Md Shorowordi, H. Efstathiadis, J. Carbonara, and S. Ahmed, “A Supervised Machine Learning Approach towards Accelerating the Development of High-performance non-Pb Perovskite Solar Devices”, submitted to Computational Materials Science (2021).
  2. A. Teli, T. Bhat, S. Beknalkar, S. Mane, L. Chaudhary, D. Patil, S. Pawar, H. Efstathiadis, J. Shin, “2D Nanoflakes Structured Bismuth Manganese Oxide Based Electrodes for Asymmetric High-Performance Coin Cell Supercapacitor”, accepted to J. Chem. Eng. (2021).
  3. D. Ghoshal, H. Shang, X. Sun, X. Wen, D Chen, T. Wang, Z. Lu, T. Gupta, H. Efstathiadis, D. West, N. Koratkar, T-M Lu, S. Zhang, S-F Shi, “Orientation Controlled Large Area Epitaxial PbI2 Thin Films with Tunable Optical Properties”, ACS Appl. Mater. Interfaces 2021, 13, 27, 32450–32460 (2021). https://doi.org/10.1021/acsami.1c05734
  4. A. Teli, S. Beknalkar, L. Choudhary, S. Mane, D. Patil, H. Efstathiadis, J. Shin, “Facile Hydrothermal Deposition of Copper-Nickel Sulfide nanostructures on Nickel-foam for Enhanced Electrochemical Performance and Kinetics of Charge Storage” accepted to Applied Surface Science (2021).
  5. A. Sood, J. Zeller, A. Sood, R. Welser, P. Ghuman, S. Babu, S. Gunapala, L. Chaudhary, H. Efstathiadis, “Development of UV to IR band nanostructured antireflection coating technology for improved detector and sensor performance” Proc. SPIE 11831, Infrared Sensors, Devices, and Applications XI, 1183109 (2021); http://dx.doi.org/10.1117/12.2598993
  6. A. Sood, J. Zeller, P. Ghuman, S. Babu, N. Dhar, R. Jacobs, S. Ganguly, A. Ghosh, L. Chaudhary, and H. Efstathiadis, “Development of high-performance graphene-HgCdTe detector technology for mid-wave infrared applications,” Proc. SPIE 11831, Infrared Sensors, Devices, and Applications XI, 1183103 (2021). http://dx.doi.org/10.1117/12.2598866
  7. A. Sood, J. Zeller, A. Sood, R. Welser, P. Ghuman, S. Babu, S. Gunapala, A. Soibel, D. Ting, L. Chaudhary, and H. Efstathiadis, “Development of nanostructured antireflection coating technology for IR band for improved detector performance,” Proc. SPIE 11858, Sensors, Systems, and Next-Generation Satellites XXV, 1185812 (2021). https://dx.doi.org/10.1117/12.2598994
  8. A. Sood, J. Zeller, P. Ghuman, S. Babu, N. Dhar, R. Jacobs, S. Ganguly, A. Ghosh, L. Chaudhary, and H. Efstathiadis, “Development of high-performance graphene-HgCdTe detector technology for mid-wave infrared applications,” Proc. SPIE 11723, Image Sensing Technologies: Materials, Devices, Systems, and Applications VIII, 117230I (2021). http://dx.doi.org/10.1117/12.2590712
  9. A. Sood, J. Zeller, A. Sood, R. Welser, H. Efstathiadis, P. Ghuman, S. Babu, S. Gunapala, “Development of UV to IR band nanostructured antireflection coating technology for improved detector and sensor performance,” Proc. SPIE 11723, Image Sensing Technologies: Materials, Devices, Systems, and Applications VIII; 117230F (2021). http://dx.doi.org/10.1117/12.2591158
  10. K-Y Kim, D. Moreno-Jimenez, and H Efstathiadis, “Electrochemical ammonia recovery from anaerobic centrate using a nickel-functionalized activated carbon membrane electrode”, Environ. Sci. Technol. 55, 11, 7674–7680 (2021). https://doi.org/10.1021/acs.est.1c01703
  11. T. Islam, R. Jani, S. Rahman, A. Islam, K. Shorowordi, S. Nishat, H. Efstathiadis, J. Carbonara, I. Grinberg, and S. Ahmed, “Investigation of non-Pb all-perovskite 4-T mechanically stacked and 2-T monolithic tandem solar devices utilizing SCAPS simulation”, SN Applied Sciences 3 504 (2021). https://doi.org/10.1007/s42452-021-04487-7
  12. A. K. Sood, J. W. Zeller, G. G. Pethuraja, A. W. Sood, and R. E. Welser, H. Efstathiadis,  P. Ghuman, S. Babu, S. Gunapala, “Development of UV to IR Band Nanostructured Antireflection Coating Technology for Improved Detector and Sensor Performance", In Sensors, Systems, and Next-Generation Satellites XXIV; vol. 11530, SPIE Remote Sensing, (2020), https://doi.org/10.1117/12.2571713
  13. T. Gupta, D. Ghoshal, A. Yoshimura, S. Basu, P. Chow, A. Lakhnot, J. Pandey  , J. Warrender, H. Efstathiadis, A. Soni, E. Osei-Agyemang, G. Balasubramanian, S. Zhang, S-F Shi, T-M Lu, V. Meunier, N. Koratkar, “An Environmentally Stable and Lead-Free Chalcogenide Perovskite”, Advanced Functional Materials 30, 23 1387 (2020).
  14. W. zhang, L. Li, H. Efstathiadis; and Y Liang, “Environmental factors affecting degradation of perfluorooctanoic acid (PFOA) by In2O3 nanoparticles”, Journal of Environmental Sciences, 93 48-56 (2020).
  15. M. Chebuske, S. Higashiya, S. Flottman, H. Bakhru F. Gittleson, B. Antonopoulos, O. Paschos and H. Efstathiadis, “Lithium-Enriched Graphite Anode Surfaces Investigated using Nuclear Reaction Analysis”, Chem. Comm., 93 (2020), DOI: 10.1039/d0cc04205f
  16. A. Sood, J. Zeller, A. W. Sood, G. Pethuraja, R. Welser, H. Efstathiadis, A. Sampath, and Ni. Dhar. “Development of nanostructured antireflection coatings for infrared sensing applications.” In Infrared Sensors, Devices, and Applications IX, vol. 11129, p. 111290I. International Society for Optics and Photonics, (2019). DOI: 10.1117/12.2531642
  17. G. Pethuraja, A. Sood, J. Zeller, R. Welser, A. Sood, H. Efstathiadis, and P. Wijewarnasuriya. “Broadband antireflection coatings for advanced sensing and imaging applications.” In Image Sensing Technologies: Materials, Devices, Systems, and Applications VI, vol. 10980, p. 109800U. International Society for Optics and Photonics, (2019). DOI: 10.1117/12.2521463
  18. G. Pethuraja, J. Zeller, R. Welser, A. Sood, H. Efstathiadis, and P. Wijewarnasuriya. “Nanostructured antireflection coatings for infrared sensors and applications.” In Infrared Sensors, Devices, and Applications VIII, vol. 10766, p. 107660I. International Society for Optics and Photonics, (2018). DOI: 10.1117/12.2323702
  19. J. Claypoole, M. Altwerger, S. Flottman, and H. Efstathiadis, “Characterization of N type Si Doped ZnO and ZnO Thin Films Deposited by RF Magnetron Sputtering” 2018 IEEE Nanotechnology Symposium (ANTS); 10.1109/NANOTECH.2018.8653571.
  20. S. Flottman, H. Frost, M. Altwerger, S. Higashiya, D. Sadana, and H. Efstathiadis, “Fabrication process validation and investigations of lithium-ionic conductors for all-solid Li-ion batteries”, (2018) IEEE Nanotechnology Symposium (ANTS); DOI: 10.1109/NANOTECH.2018.8653570
  21. A. Sood, J. Zeller, P. Ghuman, S. Babu, R. Dupuis, and H. Efstathiadis. “Development of high performance ultraviolet and near-infrared detector technologies.” In Infrared Sensors, Devices, and Applications VIII, vol. 10766, p. 1076609. International Society for Optics and Photonics, (2018). DOI: 10.1117/12.232364
  22. C. R. Philippi, J. Zeller, N. K. Dhar, P. Wijewarnasuriya, A. Sood, and H. Efstathiadis. “Model development of pin germanium devices for infrared detection.” Optics and Photonics Journal 8, no. 6 (2018): (2018). DOI: 10.4236/opj.2018.86018.
  23. J. Zeller, A. K. Sood, C. Rouse, H. Efstathiadis, P. Haldar, N. K. Dhar, and P. Wijewarnasuriya, “Germanium photodetectors fabricated on 300 mm silicon wafers for near-infrared focal plane arrays,” In Infrared Sensors, Devices, and Applications VII, vol. 10404, p. 104040H. International Society for Optics and Photonics, (2017). DOI: 10.1117/12.2277958.
  24. G. Pethuraja, John W. Zeller, Roger E. Welser, Harry Efstathiadis, Pradeep Haldar, Priyalal S. Wijewarnasuriya, Nibir K. Dhar, and Ashok K. Sood. “Development of nanostructured antireflection coatings for infrared technologies and applications.” In Infrared Sensors, Devices, and Applications VII, vol. 10404, p. 104040S. International Society for Optics and Photonics, (2017). DOI: 10.1117/12.2277957.
  25. G. Pethuraja, J. Zeller, R. Welser, A. Sood, H Efstathiadis, P Haldar, E. DeCuir, P. Wijewarnasuriya, and N. Dhar. “Development of nanostructured antireflection coatings for infrared image sensing technologies.” In Image Sensing Technologies: Materials, Devices, Systems, and Applications IV, vol. 10209, p. 102090D. International Society for Optics and Photonics, (2017). DOI: 10.1117/12.2268856.
  26. G. Pethuraja, J. Zeller, R. Welser, A. Sood, H. Efstathiadis, P. Haldar, P. Wijewarnasuriya, and N. Dhar, “Development of Nanostructured Antireflection Coatings for Infrared and Electro-Optical Systems”, Sensors & Transducers 214, 7: 46 (2017).
  27. A. Sood, J. Zeller, Y. Puri, C. Rouse, P. Haldar, and H. Efstathiadis, N. Dhar, P. Wijewarnasuriya, “SiGe Focal Plane Array Detector Technology for Near-Infrared Imaging”, Int. J. Engr. 10(1), 81-103 (2017).
  28. J. Warrender, Q. Hudspeth, G. Malladi, H. Efstathiadis and J. Mathews, “Incorporation of gold into silicon by thin film deposition and pulsed laser melting”, Applied Physics Letters 109, 23 (2017).
  29. J. Claypoole, M. Altwerger, D. Dwyer, S. Novak, P. Haldar, M. Eisaman, H. Efstathiadis, “Sputter Rate Measurements of Cu(In,Ga)Se2 Absorber Layers with Varied Ga Ratios, Primary Voltage, and Angle of Incidence by Secondary Ion Mass Spectrometry”, Journal of Alloys and Compounds 696, 808–813 (2017). DOI:10.1016/j.jallcom.2016.12.007
  30. J. Zeller, C. Rouse, H. Efstathiadis, P. Haldar, J. Lewis, N. Dhar, P. Wijewarnasuriya, Y. Puri, A. Sood, “Development of silicon-germanium visible-near infrared arrays”, In Image Sensing Technologies: Materials, Devices, Systems, and Applications III, vol. 9854, p. 985408. International Society for Optics and Photonics, (2016). DOI: 10.1117/12.2229650.
  31. G. Pethuraja, R. Welser A. Sood, H. Efstathiadis, P. Haldar, P. Wijewarnasuriya, N. Dhar “Development of Nanostructure Antireflection Coatings for EO/IR Sensor Applications”, In Image Sensing Technologies: Materials, Devices, Systems, and Applications III, vol. 9854, p. 985407. International Society for Optics and Photonics, (2016). DOI: 10.1117/12.2229647.
  32. A. Sood, I. Lund, J. Zeller, Y Puri, H. Efstathiadis, P. Haldar, N. Dhar, J. Lewis, P. Wijewarnasuriya, “Development of Graphene Based Detectors for EO/IR Applications”, In Image Sensing Technologies: Materials, Devices, Systems, and Applications III, vol. 9854, p. 98540D. International Society for Optics and Photonics, (2016). DOI: 10.1117/12.2229649.
  33. C. Rouse, J. Zeller, H. Efstathiadis, P. Haldar, J. Lewis, N. Dhar, P. Wijewarnasuriya, Y. Puri, A. Sood, “Development of Low Dark Current SiGe Near-Infrared PIN Photodetectors on 300 mm Silicon Wafers”, Opt. Photonics J., 6, 61-68 (2016).  DOI: 10.4236/opj.2016.65009
  34. R. Zhang, T. Abtew, N. Quackenbush, L. Wangoh, M. Huie, A. Brady, D. Bock, H. Efstathiadis, S. Whittingham, A. Marschilok, K. Takeuchi, E. Takeuchi, P. Zhang, L. Piper, “Electrode Reaction Mechanism of Ag2VO2PO4 cathode”, Chem Mater, 28(10), 3428-3434 (2016).
  35. R. LaForest, I. Gherasoiu, D. White, and H. Efstathiadis, “P-TECH: A New Model for an Integrated Engineering Technology Education”, Proc. of St. Lawrence Section of the American Society for Engineering Education, (2016).
  36. D. Dissanayake, A. Ashraf, D. Dwyer, K. Kisslinger, L. Zhang, Y. Pang, H. Efstathiadis, and M. Eisaman, “Spontaneous and strong multi-layer graphene n-doping on soda-lime glass and its application in graphene-semiconductor junctions”, Nature Scientific Reports, 6, 21070 (2016).
  37. B. Peace, J. Claypoole, N. Sun, D. Dwyer, M. Eisaman, P. Haldar, and H. Efstathiadis, “Characterization of Cu(In,Ga)Se2 (CIGS) films with varying gallium ratios for thin-film photovoltaic (PV) devices”, Journal of Alloys and Compounds 657, 873-877 (2016).
  38. Q Nian, M. Callahan, M. Saei, D. Look, H. Efstathiadis, J. Bailey, G. J. Cheng, 2015, "Large Scale Laser Crystallization of Solution-based Alumina-doped Zinc Oxide (AZO) Nanoinks for Highly Transparent Conductive Electrode", Nature Scientific Reports, 5, 1551 (2015).
  39. S. McMahon, A. Chaudhari, R Vispute, Z. Zhouying and H. Efstathiadis, “Textured (111) crystalline silicon thin film growth directly on flexible glass by e-beam evaporation”, Materials Letters 158, 269-273 (2015).
  40. Q. Nian, M. Callahan, D. Look, H. Efstathiadis, J. Bailey, and G. J. Cheng, “Highly transparent conductive electrode with ultra-low HAZE by grain boundary modification of aqueous solution fabricated alumina-doped zinc oxide nanocrystals”, Applied Physics Letters Materials, 3, 062803 (2015). https://doi.org/10.1063/1.4915489
  41. J. Alexander, N. Sun, R. Sun, H. Efstathiadis, and P. Haldar, “Development and characterization of transparent and conductive InZnO films by magnetron sputtering at room temperature”, Journal of Alloys and Compounds 633, 157–164 (2015).
  42. Y. Pang, H. Efstathiadis, D. Dwyer, and M. Eisaman, “Reconstruction of the charge collection probability in a CIGS solar cell by the regularization method “in: Proceedings of the 42nd IEEE Photovoltaic Specialists Conference, pp 1-4 (2015) DOI: 10.1109/PVSC.2015.7356018.
  43. S. Leonardi, F. Di Fonzo, A. Li Bassi, T. M. Murray H. Efstathiadis and J. Kunze-Liebhäuser, “TiO2 Nanotubes: Interdependence of Substrate Grain Orientation and Growth Rate”, ACS Appl. Mater. Interfaces 7, 3, 1662-1668 (2015). https://doi.org/10.1021/am507181p.
  44. A. Sood, G. Pethuraja, R. Welser, Y. Puri, N. Dhar, P. Wijewarnasuriya, J. Lewis, H. Efstathiadis, P. Haldar, and E. Schubert. “Development of large area nanostructured antireflection coatings for EO/IR sensor applications.” International Journal of Nanoscience and Nanotechnology 6, no. 1: 57-70 (2015).
  45. A. Sood, J. Zeller, R. Richwine, Y. Puri, H. Efstathiadis, P. Haldar, N. Dhar, and D. Polla. “SiGe based visible-NIR photodetector technology for optoelectronic applications.” In Advances in Optical Fiber Technology: Fundamental Optical Phenomena and Applications. Intech Open, (2015). DOI: 10.5772/59065
  46. J. Zeller, H. Efstathiadis, G. Bhowmik, P. Haldar, N. Dhar, J. Lewis, P. Wijewarnasuriya, Y. Puri, and A. Sood. “Development of Ge PIN photodetectors on 300 mm Si wafers for near-infrared sensing.” International Journal of Engineering Research and Technology 8, no. 1: 23-33 (2015).
  47. I. Gherasoiu, M. Abdallah, D. Das, D. Jones, and H. Efstathiadis, “Nanotechnology Education at SUNY Poly”, Proc. of St. Lawrence Section of the American Society for Engineering Education, (2015).
  48. S. McMahon, A. Chaudhari, R Vispute, H. Efstathiadis, and Z. Zhouying, “Highly textured Si [111] crystalline thin-film on buffered soda-lime glass by e-beam evaporation”, Materials Letters 140 123-126 (2015).
  49. G. Pethuraja, R. Welser, J. Zeller, Y. Puri, A. Sood, H. Efstathiadis, P. Haldar, J. Harvey, “Advanced Flexible CIGS Solar Cells Enhanced by Broadband Nanostructured Antireflection Coatings”, Mat. Res. Soc. Symp. Proc., 1771 pp. 145-150 (2015), DOI: 10.1557/opl.2015.589.
  50. G. Pethuraja, R. Welser, J. Zeller, Y. Puri, A. Sood, H. Efstathiadis, P. Haldar, N. Dhar, and P. Wijewarnasuriya, “Nanostructured Antireflection Coating for Optical Detection and Sensor Applications” Mat. Res. Soc. Symp. Proc., 1805 (2015) DOI: 10.1557/opl.2015.689
  51. G. Pethuraja, R. Welser, J. Zeller, Y. Puri, A. Sood, H. Efstathiadis, P. Haldar, and J. Harvey, “Antireflection coatings for enhancing power output of solar panels”, Mat. Res. Soc. Symp. Proc., 1771, pp. 67-72, A (2015) DOI: 10.1557/opl.2015.509.
  52. J. Zeller, C. Rouse, H. Efstathiadis, P. Haldar, N. Dhar, J. Lewis, P. Wijewarnasuriya, Y. Puri, and A. K. Sood. “Design and development of wafer-level near-infrared micro-camera.” In Infrared Sensors, Devices, and Applications V, vol. 9609, p. 96090O. International Society for Optics and Photonics, (2015). DOI: 10.1117/12.2193179. (BEST PAPER AWARD Presented at: SPIE Optics+ Photonics Conference 9609: Infrared Sensors, Devices, and Applications V).
  53. A. Sood, G. Pethuraja, R. Welser, Y. Puri, N. Dhar, P. Wijewarnasuriya, J. Lewis, H. Efstathiadis, P. Haldar, and F. Schubert. “Development of large area nanostructured antireflection coatings for EO/IR sensor applications.” In Infrared Sensors, Devices, and Applications V, vol. 9609, p. 96090D. International Society for Optics and Photonics, (2015). DOI: 10.1117/12.2214877.
  54. A. Chaudhari, R Vispute T. Murray, and H. Efstathiadis, “Crystalline Al2O3 on buffered soda-lime glass by e-beam”, Materials Letters 136, 407-410, (2014).
  55. I. Lund, J. Lee, H. Efstathiadis, P. Haldar, and R Geer, “The cycling performance and surface passivation qualities of a heterogeneous amorphous NixSiOy/polycrystalline NiSi2 core shell nanowire used as a Li-ion battery anode”, J. Electrochem. Soc. 161(12): A1772-A1776 (2014).
  56. J. Mathews, A. Akey, D. Recht, G. Malladi, H Efstathiadis, M. Aziz, and J. Warrender, “On the limits to Ti incorporation into Si using pulsed laser melting”, Appl. Phys. Lett., 104, 112102 (2014)
  57. A. Sood, I. Lund, Y. Puri, H. Efstathiadis, P. Haldar, N. Dhar, D. Polla, M. Dubey, and E. Zakar. “A review of growth, functionalization, and use of graphene for detection applications.” In International Journal of Nanoscience and Nanotechnology 5, no. 2 (2014): 133-150.
  58. A. Chaudhari, R. D. Vispute, H. Efstathiadis, “Extremely Highly Textured MgO [111] Crystalline Films on Soda-Lime Glass by E-Beam”, Materials Letters 121 47-49 (2014).
  59. I. Lund, J-H Lee, H. Efstathiadis, P. Haldar, R. E Geer, “Influence of Catalyst Layer Thickness on the Growth of Nickel Silicide Nanowires and its Application for Li-Ion Batteries”, Journal of Power Sources, 246 117-123 (2014).
  60. J. Alexander, S. Higashirya, D. Caskey, H. Efstathiadis, and P. Haldar, “Deposition and characterization of cadmium sulfide (CdS) by chemical bath deposition using an alternative chemistry cadmium precursor”, Solar Energy Materials & Solar Cells 125 47–53 (2014).
  61. J. Zeller, Y. Puri, A. Sood, S. McMahon, H. Efstathiadis, P. Haldar, and N. Dhar. “Design and development of SiGe based near-infrared photodetectors.” In Infrared Sensors, Devices, and Applications IV, vol. 9220, p. 922006. International Society for Optics and Photonics, (2014). DOI: 10.1117/12.2083538.
  62. D. Fobare, P. Haldar, H. Efstathiadis, D. Metacarpa, J. Wax, J. Olenick, K. Olenick, V. Venkateswaran, “Novel Application of Yttria Stabilized Zirconia as a Substrate for Thin Film CIGS Solar Cells”, in: Proceedings of the 40th IEEE Photovoltaic Specialists Conference, 341-344, 10.1109/PVSC.2014.6924927 (2014).
  63. Z. Zhao, L. Rice, H. Efstathiadis, P. Haldar, “Annealing and thickness related performance and degradation of polymer solar cells”, Microelectronics Reliability, 53, 123–128, (2013).
  64. G. Pethuraja, A. Sood, R. Welser, A. K. Sood, H. Efstathiadis, P. Haldar, and J. Harrvey, “Large-Area Nanostructured Self-Assembled Antireflection Coatings for Photovoltaic Devices”, in: Proceedings of the 39th IEEE Photovoltaic Specialists Conference, pp 99-102 (2013) DOI:10.1109/PVSC.2013.6744108.
  65. S. Teehan, H. Efstathiadis, P. Haldar, “Thermoelectric power factor enhancement of AZO/In-AZO quantum well multilayer structures as compared to bulk films” Journal of Alloys and Compounds”, Journal of Alloys and Compounds 539 129–136 (2012). https://doi.org/10.1016/j.jallcom.2012.04.029
  66. G. Pethuraja, R. Welser, A. Sood, C Lee, N Alexander, H. Efstathiadis, P. Haldar, and J. Harvey, “Current-Voltage Characteristics of ITO/p-Si and ITO/n-Si Contact Interfaces” Advances in Materials Physics and Chemistry, 2, 2, 59-62 (2012).
  67. G. Pethuraja, R. Welser, A. Sood, C. Lee, N. Alexander, H. Efstathiadis, P. Haldar, J. Harvey, “Effect of Ge incorporation on band gap and photosensitivity of amorphous SiGe thin films”, Materials Science and Applications, 3, 2, 67-71 (2012). DOI: 10.1007/S11664-012-2084-8
  68. S. Teehan, H. Efstathiadis, P. Haldar, “Thermoelectric Performance of ZnO:Al/ZnO:(Al,In) Quantum Well Multilayer Structures as a Function of Indium Composition and Band-Gap Offset at High Operating Temperatures” Journal of Alloys and Compounds”, J. Electr Mat. 41 1831–1837 (2012).
  69. G. Pethuraja, H. Efstathiadis, C. Rouse, M. Rane-Fondacaro, A. Sood and P. Haldar “Silicon Nanowire Development for Solar Cell Devices, in: Proceedings of the 38th IEEE Photovoltaics Specialists Conference, pp. 001911-001916 (June 2012) DOI: 10.1109/PVSC.2012.6317967.
  70. S. Leonardi, A. Li Bassi, V. Russo, F. Difonzo, O. Paschos, T. Murray, H. Efstathiadis, J. Kunze, “TiO2 Nanotubes - Interdependence of Substrate Grain Orientation and Growth Characteristics", J. Phy. Chem 116, 384-392, (2012). https://doi.org/10.1021/jp209418n
  71. S. Teehan, H. Efstathiadis, P. Haldar, “Enhanced Power Factor of Indium Co-Doped ZnO:Al Thin Films Deposited by RF Sputtering for High Temperature Thermoelectrics” Journal of Alloys and Compounds”, Journal of Alloys and Compounds 509(3) 1094–1098 (2011).
  72. M. Hansen, H. Efstathiadis, and P. Haldar, “Development of smooth CuInGa precursor films for CuIn1-xGaxSe2 thin film solar cell applications”, Thin Solid Films 519, 19, 6297 – 6301 (2011).
  73. Z. Zhao, R. Teki, H. Efstathiadis, P. Haldar, “Metal oxide buffer layer for improving performance of polymer solar cell”, Applied Surface Science 256 6053–6056 (2010).
  74. A. Nguyen, M. V. Rane-Fondacaro, H. Efstathiadis, P. Haldar, L. Michaelson, C. Wang, K. Munoz, T. Tyson, A. Gallegos, “Formation of a Low Ohmic Contact Nickel Silicide Layer on Textured Silicon Wafers Using Electroless Nickel Plating”, in: Proceedings of the 26th European Photovoltaic Solar Energy Conference, 2672-2675, ISBN 3-936338-26-4 (2010).
  75. D. Dwyer, R. Sun, H. Efstathiadis, and P. Haldar, “Characterization of Chemical Bath Deposited Buffer Layers for Thin Film Solar Cell Applications”, Physica Status Solidi A 207, 10, 2272 (2010).
  76. M. Mazumder, T. Borca-Tasciuc, S. Teehan, E. Stinzianni, H. Efstathiadis, and S. Solovyov, “Temperature dependent thermal conductivity of Si/SiC superlattice”, Appl. Phys. Lett., 96 093103 (2010).
  77. D. Dwyer, I. Repins, H. Efstathiadis, P. Haldar, “Selenization of Co-sputtered CuInAl Precursors”, Solar Energy Materials & Solar Cells 94, 598-605 (2010).
  78. Z. Zhao, R. Teki, N. Koratkar, H. Efstathiadis, P. Haldar, “Metal Oxide Buffer Layer for Improving Performance of Polymer Solar Cells”, Applied Surface Science, 256, pp 6053-6056 (2010).
  79. E. A. Stinzianni, H. Efstathiadis, K. A. Dunn, and P. Haldar, “Role of Temperature and Duration of the Crystallization Anneal in the Texture Development of YBCO Prepared by TFA-MOD, Applied Superconductivity, IEEE Transactions on, 19, 3, 3, 2877-2881, (2009).
  80. Z. Zhao, L. Rice, H. Efstathiadis and P. Haldar, “Thickness Dependent Effects of Thermal Annealing and Solvent Vapor Treatment of Poly(3-hexylthiophene) and Fullerene Bulk Heterojunction Photovoltaics”, Mat. Res. Soc. Symp. Proc. Vol. 1123, (2009).
  81. C. Lee, H. Efstathiadis, J. Raynolds, P. Haldar, “Two-dimensional Computer Modeling of Single Junction a-Si:H Solar Cells”, in: Proceedings of the 34th IEEE Photovoltaic Specialists Conference, 1118-1122 (2009).
  82. E. Stinzianni, K. Dunn, Z. Zhouying, M. Rane-Fondacaro, H. Efstathiadis, and P. Haldar, “Relationship of Aluminum Grain Size to the Grain Size of Polycrystalline Silicon Produced By the Aluminum-Induced Crystallization of Amorphous Silicon”, in: Proceedings of the 34th IEEE Photovoltaic Specialists Conference, 1643-1648 (2009).
  83. A. Nguyen, H. Efstathiadis, A. Fioramonti, D. Morrissey, P. Haldar, “Feasibility of Improving Front Metallization Lines for Photovoltaic Devices”, in: Proceedings of the 34th IEEE Photovoltaic Specialists Conference, 312-315 (2009).
  84. D. Dwyer, I. Repins, H. Efstathiadis, P. Haldar, “Deposition of CuInAlSe2 films using co-sputtered precursors and selenization”, in: Proceedings of the 34th IEEE Photovoltaic Specialists Conference, 247–251 (2009).
  85. O. Paschos, P. Choi, H. Efstathiadis and P. Haldar, “Synthesis of Platinum Nanoparticles by Aerosol Assisted Deposition Method”, Thin Solid Films 516, pp. 3796-3801, (2008).
  86. M. Patel, S. Guo, A. Stavrides, J. Cambridge, L. Le, H. Efstathiadis, P. Haldar, and A. E. Delahoy, “Deposition of Large Area, Directly Textured, ZnO:Al Films by Reactive-Environment, Hollow Cathode Sputtering”, Electronics, in: Proceedings of the 33rd Photovoltaic Specialists Conference, Philadelphia, PA (2008). DOI:10.1109/PVSC.2008.4922812
  87. L. Rice, Z. Zhao, H. Efstathiadis, P. Haldar, “Thickness Dependent Effects of Thermal Annealing and Solvent Vapor Treatment of Poly (3-hexylthiophene) and Fullerene Bulk Heterojunction Photovoltaics”, Mat. Res. Soc. Symp. Proc., Boston, MA (2008).
  88. S. Anwar, A. Peskin, H. Dhillon, and H. Efstathiadis, "An Innovative Undergraduate Nanoscience and Technology Program for Adult Learners", E-Proceedings of the 2008 American Society for Engineering Education/ Conference for Industry and Education Collaboration, Annual Conference Proceedings (2008).
  89. M. Mazumder, Theodorian Borca-Tascicuc, H. Efstathiadis and T. Yu, “Thermal conductivity measurement of silicon/ silicon carbide superlattice”, Mat. Res. Soc. Symp. Proc., 861, 9 (2008).
  90. C. V. Varanasi, L. Brunke, J. Burke, I. Maartense, N. Padmaja, H. Efstathiadis, A Chaney and P. Barnes, “Biaxially Textured Constantan Alloy (Cu 55 wt%, Ni 44 wt%, Mn 1 wt%) Substrates for YBa2Cu3O7-x coated conductors”, Supercond. Sci. Technol. 19, pp. 896-901, (2006).
  91. Y. Xu, C. H. Lei, B. Ma, H. Evans, H. Efstathiadis, M. Rane, M. Massey, U. Balachandran and R. Bhattacharya, “Growth of Textured MgO Through e-beam Evaporation and Inclined Substrate Deposition”, Supercond. Sci. Technol. 19, pp 835-843 (2006).
  92. Hua Ye, H. Efstathiadis, and P. Haldar, “Numerical Thermal Simulation of Cryogenic Power Modules Under Liquid Nitrogen Cooling” J. Electron. Packag., 128 (3), pp 267-272 (2006).
  93. H. Efstathiadis, T. Yu, P. Haldar and R. Matyi, “Si/SiC Multilayers for Thermoelectric generators – A high resolution x-ray reflectometry study”, 8th Biennial Conference proceedings on High Resolution X-Ray Diffraction and Imaging, Karlsruhe/Baden-Baden (Germany) (2006).
  94. S. Gallis, M. Huang, H. Efstathiadis, E. Eisenbraun, E. Nyein, U. Hommerich, and A. E. Kaloyeros, “Photoluminescence in erbium doped amorphous silicon oxycarbide thin films”, Appl. Phys. Lett., 87, 091901 (2005).
  95. G. Sirinakis, R. Siddique, K. Dunn, H. Efstathiadis, M. Carpenter, A. E. Kaloyeros, and L. Sun, “Spectroellipsometric Characterization of Au- Y2O3-stabilized ZrO2 Nanocomposite Films”, J. Mat. Res. 20 (12) pp 3320-3328 (2005).
  96. P. Haldar, H. Ye, H. Efstathiadis, J. Raynolds, M. J. Hennessy, O. M. Mueller, and E. K. Mueller, “Improving Performance of Cryogenic Power Electronics”, Applied Superconductivity, IEEE Transactions on, 15 (2), pp. 2370-2375 (2005).
  97. M. V. Rane, H. Efstathiadis, H. Bakhru, M. W. Rupich, X. Li, W. Zhang, T. Kodenkandath, and P. Haldar, “Fluorine Analysis and Microstructural Evolution in Coated YBCO Conductor Deposited by Metal Trifluoroacetate Process”, Applied Superconductivity, IEEE Transactions on, 16, pp. 2638-2641, (2005).
  98. T. Yu, H. Efstathiadis, R. Matyi, P. Haldar, S. Ghamaty and N, Elsner, “Large Area Deposition of Si/SiC Quantum Well Films for Thermoelectric Generator Applications”, Mat. Res. Soc. Symp. Proc., 886, Boston, MA (2005).
  99. G. Sirinakis, L. Sun, R. Siddique, H. Efstathiadis, M. A. Carpenter, and A. E. Kaloyeros, “Synthesis and Spectroellipsometric Characterization of Y2O3-stabilized ZrO2-Au Nanocomposite Films for Smart Sensor Applications”, Mat. Res. Soc. Symp. Proc., 846, 269-274, Boston, MA (2005).
  100. S. Galis, M. Huang, V. Nikas, H. Efstathiadis, E. Eisenbraun, E. Nyein, U. Hommerich, and A. E. Kaloyeros, “Erbium-doped Amorphous- Si-C-O Matrix (a-SiCxOy:Er) - A Novel Silicon-based Material for Near-infrared Optoelectronic Applications”, Mat. Res. Soc. Symp. Proc., 866, San Francisco, CA (2005).
  101. B. Landi, P. Denno, R. DiLeo, W. VanDerveer, R. Raffaelle, H. Efstathiadis, and P. Haldar, “Carbon Nanotubes for Space Photovoltaic Applications”, 19th Space Photovoltaics Research and Technology (SPRAT) conference proceedings, Cleveland, OH (2005).
  102. S. Huang, H. Efstathiadis, and P. Haldar, H. G. Lee, B. Landi, and R. Raffaelle, “Fabrication of Nanorod Arrays for Organic Solar Cell Applications”, Mater. Res. Soc. Symp. Proc., 836, 49-53, Boston, MA (2005).
  103. M. Hatzistergos, H. Efstathiadis, J. Reeves, V. Selvamanickam, L. Allen, E. Lifshin, and P. Haldar, “Microstructural and Compositional Analysis of YBCO films Grown by MOCVD Before and After GCIB Smoothing” Physica C, 405, pp. 179-186 (2004).
  104. L. Sun, J-C Fouere, T. Summet, M. Hatzistergos, and H. Efstathiadis, “Spectroscopic Ellipsometry and Grazing x-ray Reflectrometry Analyses on Tungsten Carbide Films for Diffusion Barrier in Copper Metallization Schemes”, Thin Solid Films, 455-456, pp. 519-524, (2004). DOI:10.1016/j.tsf.2004.01.058
  105. S. Gallis, H. Efstathiadis, M. Huang, E. Nyein, U. Hommerich, and A. E. Kaloyeros, “Photoluminescence at 1540 nm from Erbium-Doped Amorphous Silicon Carbide Films”, J. Mat. Res., 19(8), pp. 2389-2393, (2004).
  106. L. Sun, J. Garvey, R. DeLeon, G. Tompa, R. Moore, and H. Efstathiadis, “Optical Properties of Hafnium Oxide Films Grown by Laser Assisted Molecular Beam Deposition”, Mater. Res. Soc. Symp. Proc., 811 Boston, MA (2004).
  107. S. Gallis, H. Efstathiadis, M. Huang, A. E. Kaloyeros, E. Nyein, and U. Hommerich, “Room-Temperature Photoluminescence at 1540 nm From Amorhous Silicon Carbide Films Implanted With Erbium”, Mater. Res. Soc. Symp. Proc. 815, 181-186, Boston, MA (2004).
  108. S. Huang, H. Efstathiadis, P. Haldar, H. G. Lee, B. Landi and R. Raffaelle, “Investigation of Nanostructure-Polymer Blend Solar Cells”, 2nd International Energy Conversion Engineering Conference (IECEC) Proceedings, 12, 232-236, Providence, RI (2004).
  109. M. S. Hatzistergos, H. Efstathiadis, E. Lifshin, A. Kaloyeros, J. Reeves and V. Selvamanickam, L. Allen and R. MacCrimmon, “Microstructural and Electrical Characterization of Gas Cluster Ion Beam Smoothed YBCO Films”, Applied Superconductivity, IEEE transactions on 13, pp. 2470-2473, (2003).
  110. S. Gallis, U. Futschik, W. Sherwood, S. Hayes, C. G. Fountzoulas, J. Castracane, A. E. Kaloyeros, and H. Efstathiadis, “Thermal Chemical Vapor Deposition of Silicon Carbide Films as Protective Coatings for Microfluidic Structures”, Mat. Res. Soc. Symp. Proc., 742, 85-90, Boston, MA (2003).
  111. R. DeLeon, J. Garvey, G. Tompa, R. Moore and H. Efstathiadis, “Laser Assisted Molecular Beam Deposition of Thin Films for Gate Dielectrics Applications”, Mat. Res. Soc. Symp. Proc. 768, 93-98, Boston, MA (2003).
  112. C. Fountzoulas, S. Tidrow, M. Hatzistergos, and H. Efstathiadis, “Effect of Deposition Parameters on the Microstructural Evolution and Electrical Properties of Charge-Balanced Barium Strontium Titanate Ferroelectric Thin Films Deposited on Ceramic Substrates by Pulsed Laser Deposition”, Mater. Res. Soc. Symp. Proc., 784, 287-292, Boston, MA (2003).
  113. M. Hatzistergos, H. Efstathiadis, A. E. Kaloyeros, J. Reeves, V. Selvamanickam, L. Allen, and R. MacCrimmon, “Microstructural and Compositional Evolution of High Temperature Superconducting Films”, Mater. Res. Soc. Symp. Proc., 784, Boston, MA (2002).
  114. U. Futschik, H. Efstathiadis, J. Castracane, and A. E. Kaloyeros, L. Macdonald, S. Hayes, and C. Fountzoulas, “A Novel Silicon-carbon Precursor for Oligomer Chemical Vapor Deposition of Silicon Carbide for Harsh Environmental Applications” Mat. Res. Soc. Symp. Proc., 697, 153-158, Boston, MA (2001).
  115. K. Dovidenko, S. Beasor, A. Topol, H. Efstathiadis, S. Oktyabrsky and A. Kaloyeros, “Interfacial Effects in VO/Al/Si(100) Thin Film Heterostructures”, Mat. Res. Soc. Symp. Proc., Boston, 654, 1-6, MA (2000).
  116. S. Skordas, G. Sirinakis, W. Yu, D. Wu, H. Efstathiadis and A. E. Kaloyeros, “Low Temperature Thermal Chemical Vapor Deposition of Silicon Nitride Thin Films for Microelectronics Applications”, Mat. Res. Soc. Symp. Proc., 606, 109-114, Boston, MA (2000).
  117. K. Barth, J. Lau, H. Efstathiadis, G. Peterson, G. Nuesca, A. Kaloyeros, R. Tuenge, and C. King, “Metal-organic Chemical Vapor Depositions of SrS:Cu for Applications in Electroluminescent Devices”, Information Display Soc. Symp. Proc. (1998). (%)
  118. Topol, H. Efstathiadis, G. Nuesca, S. Lane, B. Taylor, K. Barth, J. Lau, G. Peterson, R. Tuenge, C. King, and A. Kaloyeros, “Metal-organic Chemical Vapor Deposition of ZnS:Mn Films for Thin Film Electroluminescent devices”, Information Display Soc. Symp. Proc. (1998).
  119. H. Efstathiadis, Z. Akkerman, and F. Smith, “Atomic bonding in amorphous alloys based on carbon, nitrogen, and hydrogen: A thermodynamic approach Mat. Res. Soc. Symp. Proc., 446: 395-400 (1997).
  120. H. Efstathiadis, Z. Akkerman, and F. Smith, “Studies of the growth and local atomic bonding of a-CxNyHz films” Mat. Res. Soc. Symp. Proc., 498: 277-282, (1997)
  121. H. Efstathiadis, Z. Akkerman, and F. Smith, “Atomic Bonding in Amorphous Carbon Alloys: A Thermodynamic Approach”, J. Appl. Phys. 79, pp. 2954-2967 (1996).
  122.  Z. L. Akkerman, H. Efstathiadis, and F. Smith, “Thermal stability of Diamond-like carbon films”, J. Appl. Phys. 80, 5, pp. 3068-3075 (1996).
  123. Z. Akkerman, H. Efstathiadis, F. Smith, “Thermodynamic modeling of atomic bonding in covalent Cx(BN)1-x alloys”, Mat. Res. Soc. Symp. Proc., 410: 217-222 (1996).
  124. H. Efstathiadis, Z. Akkerman, F. Smith, “Characterization of amorphous carbon films based on carbon, nitrogen, and hydrogen”, Mat. Res. Soc. Symp. Proc., 415: 51-56 (1996).
  125. H. Efstathiadis and F. W. Smith, “Thermodynamic Modeling of the Local Atomic Order in Amorphous Alloys Based on Silicon and Germanium”, Philosophical Magazine B, 70, pp. 547-556 (1994).
  126. F. Smith, H. Efstathiadis H, Z. Yin, “Dangling bonds in amorphous silicon nitride alloys: Predictions of the free energy model”, Mat. Res. Soc. Symp. Proc., 284: 95-100 (1993).
  127. H. Efstathiadis, Z. Yin, and F. W. Smith, “Atomic bonding in amorphous hydrogenated silicon carbide alloys: A statistical thermodynamic approach”, Physical Review B 46 (20), pp. 13119-13130 (1992).

 

Book Chapters

  1. Review of Graphene Technology and Its Applications for Electronic Devices, A. Sood, I. Lund, Y. Puri, H. Efstathiadis, P. Haldar, N. Dhar, J. Lewis, M. Dubey, E. Zakar, P. Wijewarnasuriya, D. Polla and M. Fritze, Chapter in Graphene - New Trends and Developments, Intech Publications (2015).
  2. SiGe based visible-NIR photodetector technology for optoelectronic applications, A. Sood, J. Zeller, R. Richwine, Y. Puri, H. Efstathiadis, P. Haldar, N. Dhar, and D. Polla, Chapter in Advances in Optical Fiber Technology: Fundamental Optical Phenomena and Applications, Intech Publications (2015).

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