Publications are organized in reverse chronological order.  For convenience, they are divided into the following categories:

	2007
	2006
	2005
	2004
	2003
	2002
	2001
	2000
	1998-1999

2007

	"Effective Efficiency of PV Modules Under Field Conditions," Progress in Photovoltaics 15, 19-26 (2007). M. Topic, K. Brecl, and J. R. Sites.
	"Strategies to Increase CdTe Solar-Cell Voltage," Thin Solid Films 515, 6099-6102 (2007). J. R. Sites and J. Pan.
	"Cu-Related Recombination in CdTe Solar Cells," Thin Solid Films, in press. S. H. Demtsu, D. S. Albin, J. R. Sites, W. K. Metzger, and A. Duda.

2006

	"Hole Current Impedance and Electron Current Enhancement by Back-Contact Barriers in CdTe Cells," J. Appl. Phys. 100, 124505, (2006). J. Pan, M. Gloeckler, and J. R. Sites.
	"Effect of Back-Contact Barrier on Thin-Film CdTe Solar Cells," Thin Solid Films 510, 320-324 (2006). S. H. Demtsu and J. R. Sites.
	"Stability Study of CdS/CdTe Solar Cells Made with Ag and Ni Back-Contacts," Solar Energy Mat. and Solar Cells 90, 2934-2943, (2006). S. H. Demtsu, D. S. Albin, J. W. Pankow and A. Davies.
	"Performance Assessment of PV Modules - Relationship Between STC Rating and Field Performance," Proc. World Conf. on Photovoltaic Energy Conversion 4, 2141-2144 (2006). M. Topic, K. Brecl, J. Kurnik, and J. R. Sites.
	"Role of Copper in the Performance of CdS/CdTe Solar Cells," Proc. World Conf. on Photovoltaic Energy Conversion 4, 523-526 (2006). S. H. Demtsu, D. S. Albin, and J. R. Sites.
	"The Relationship of CdS/CdTe Band Profiles to J-V Characteristics and Bias-Dependent Quantum Efficiency," Proc. World Conf. on Photovoltaic Energy Conversion 4, 376-379 (2006). A. L. Fahrenbruch.
	"Effective Efficiency and Performance Ratio as Energy Rating System for PV Modules," Proc. E-PVSEC 21, 2507-2510 (2006). M. Topic, K. Brecl, J. Kurnik, and J. R. Sites.
	"Film Thickness and Chemical Processing Effects on the Stability of CdTe Solar Cells," Thin Solid Films 515, 2659-2668 (2006). D. S. Albin, S. H. Demtsu, and T. J. McMahon.
	"High Efficiency Thin Film CuIn1-xGaxSe2 Photovoltaic Cells Using a Cd1-xZnxS Buffer Layer," Appl. Phys. Lett. 89, 253503 (2006). R. N. Bhattacharya, M. A. Contreras, B. Egaas, R. Noufi, A. Kanevce, and J. R. Sites.

2005

	"Quantification of Losses in Thin-Film CdS/CdTe Solar Cells," Proc. IEEE Photovoltaic Specialists Conf. 31, 347-350 (2005). S. H. Demtsu and J. R. Sites.
	"LBIC Analysis of Thin-Film Polycrystalline Solar Cells," Proc. IEEE Photovoltaic Specialists Conf. 31, 199-204 (2005). J. R. Sites and T. J. Nagle.
	"Grain-boundary Recombination in Cu(In,Ga)Se2 Solar Cells,"  J. Appl. Phys. 98, 113704 (2005). M. Gloeckler, J. R. Sites, and W. K. Metzger.
	"Potential of Sub-micrometer Thickness Cu(In,Ga)Se2 Solar Cells,"  J. Appl. Phys. 98, 103703 (2005). M. Gloeckler and J. R. Sites.
	"Simulation of Polycrystalline Cu(In,Ga)Se2 Solar Cells in Two Dimensions," Proc. Mat. Res. Soc. 865, 381-386 (2005). M. Gloeckler, J. R. Sites, and W. K. Metzger.
	"Current Transients in CdS/CdTe Solar Cells," Proc. Mat. Res. Soc. 865, 355-360 (2005). A. Fahrenbruch.
	"Conduction-Band-Offset Rule Governing J-V Distortion in CdS/CI(G)S Solar Cells," Proc. Mat. Res. Soc. 865, 221-226 (2005). A. Kanevce, M. Gloeckler, A. O. Pudov, and J. R. Sites.
	"Photoluminescence Studies on Cu and O Defects in Crystalline and Thin-film CdTe," Proc. Mat. Res. Soc.  865, 197-202 (2005). C.R. Corwine, J. R. Sites, T. A. Gessert, W. K. Metzger, P. Dippo, J. Li, A. Duda, and G. Teeter.
	"CdTe Photoluminescence: Comparison of Solar-Cell Material with Surface-Modified Single Crystals," Appl. Phys. Lett. 86, 221909 (2005). C. R. Corwine, J. R. Sites, T. A. Gessert, W. K. Metzger, P. Dippo, J. Li, A. Duda, and G. Teeter.
	"Band-gap Grading in Cu(In,Ga)Se2 Solar Cells," J. Phys. Chem. Solids, 66, 1891-1894 (2005). M. Gloeckler and J. R. Sites.
	"CIGS J-V Distortions in the Absence of Blue Photons," Thin Solid Films 480-481, 273-278 (2005).  A. O. Pudov, M. A. Contreras, T. Nakada,  H. -W. Schock, and J. R. Sites.
	"Efficiency Limitations for Wide-Band-Gap Chalcopyrite Solar Cells," Thin Solid Films 480-481, 241-245 (2005).  M. Gloeckler and J. R. Sites.
	"A Comparative Study of Defect States in Evaporated and Selenized CIGS(S) Solar Cells," Prog. Photovolt: Res. Appl. 13, 1-8 (2005). P. K. Johnson, J. T. Heath, J. D. Cohen, K. Ramanathan, and J. R. Sites.
	"Secondary Barriers in CdS-CuIn1-xGaxSe2 Solar Cells," J. Appl. Phys. 97, 064901 (2005) .  A. O. Pudov, A. Kanevce, H. Al-Thani, J. R. Sites, and F. S. Hasoon.

2004

	"Physical Characterization of Thin-film Solar Cells," Progress in Photovoltaics 12, 177-217 (2004).  K. Durose, S. Asher, W. Jagermann, D. Levi, B. E. McCandless, W. Metzger, H. Moutinho, P. D. Paulson, C. L. Perkins, J. R. Sites, G. Teeter, M. Terhaggen.
	"Quantum Efficiency of CdTe Solar Cells in Forward Bias," Proc. E-PVSEC 19, 1863-1866 (Strasbourg, 2004). M. Gloeckler and J. R. Sites.
	"Copper Inclusion and Migration from the Back Contact in CdTe Solar Cells,"  Solar Energy Mat. and Solar Cells 82, 481-489 (2004). C. R. Corwine, A. O. Pudov, M. Gloeckler, S. H. Demtsu, and J. R. Sites.
	"Apparent Quantum Efficiency Effects in CdTe Solar Cells," J. Appl. Phys., 95, 4438-4445 (2004). M. Gloeckler and J. R. Sites.

2003

	"ZnO/ZnS(O,OH)/Cu(In,Ga)Se2/Mo Solar Cell with 18.6% Efficiency," Proc. World Conf. on Photovoltaic Energy Conversion 3, 570-573 (Osaka, Japan, May 2003). M.A. Contreras, T. Nakada, M. Hongo, A. O. Pudov, and J. R. Sites.
	"Numerical Modeling of CIGS and CdTe Solar Cells:  Setting the Baseline," Proc. World Conf. on Photovoltaic Energy Conversion 3, 491-494 (Osaka, Japan, May 2003). M. Gloeckler, A. L. Fahrenbruch, and J. R. Sites.
	"Influence of Annealing in Different Chlorides on the Photovoltaic Parameters of CdS/CdTe Solar Cells," Solar Energy Mat. and Solar Cells 80, 327-334 (2003).  T. Potlog, L. Ghimpu, P. Gashin, A. Pudov, T. Nagle, and J. R. Sites.
	"Explanation of Light/Dark Superposition Failure in CIGS Solar Cells," Proc. Mat. Res. Soc. 763, 231-236 (2003). M. Gloeckler, C. R. Jenkins, and J. R. Sites.
	"Cadmium Telluride Solar Cells," B. E. McCandless and J. R. Sites, Handbook of Photovoltaic Science and Engineering, Chapter 14, 617-652, A. Luque and S. S. Hagedus, Eds. (John Wiley, 2003).
	"Quantification of losses in thin-film polycrystalline solar cells," Solar Energy Mat. and Solar Cells 75, 243-251 (2003). J. R. Sites.
	"Surface Treatment of CuInGaSe2 Thin Films and Its Effect on the Photovoltaic Properties of Solar Cells,"   J. Phys. Chem. Solids 64, 1495-1498 (2003). K. Ramanathan, F. S. Hasoon, S. Smith, D. L. Young, and M. A. Contreras; and P. K. Johnson, A. O. Pudov, and J. R. Sites.

2002

	"Interface Properties of CIGS(S)/Buffer Layers Formed by the Cd-Partial Electrolyte Process,"  Proc. IEEE Photovoltaic Specialists Conf. 29, 964-967 (2002).  P. K. Johnson, A. O. Pudov, J. R. Sites, K. Ramanathan, F. S. Hasoon and D. E. Tarrant.
	"Effect of Back-Contact Copper Concentration on CdTe Cell Operation," Proc. IEEE Photovoltaic Specialists Conf. 29, 768-771 (2002).  A. O. Pudov, M. Gloeckler, S. H. Demtsu, J. R. Sites, K. L. Barth, R. A. Enzenroth and W. S. Sampath.
	"Properties of Cd and Zn Partial Electrolyte Treated CIGS Solar Cells," Proc. IEEE Photovoltaic Specialists Conf. 29, 523-526 (2002).  K. Ramanathan, F. S. Hasoon, S. Smith, H. Al-thani, J. Alleman, H. S. Ullal, J. Keane, P. K. Johnson, and J. R. Sites.
	"Performance and Loss Analyses of High-Efficiency CBD-ZnS/Cu(In1-xGax)Se2 Thin-Film Solar Cells," Japanese J. Appl. Phys. 41, 672-677 (2002).  A. Pudov, J. R. Sites and T. Nakada.

2001

	"Comparison of Trap States Between CIGSS/CdS/ZnO and Cd PE CIGSS/ZnO Cells," Proc. E-PVSEC 17, 1035-1038 (2001).  P. K. Johnson , A. O. Pudov, J. R. Sites, K. Ramanathan, F. S. Hasoon and D. E. Tarrant.
	"Micron-Resolution Photocurrent of CdTe Solar Cells Using Multiple Wavelengths," Proc. Mat. Res. Soc. 668, H9.8.1-H9.8.7 (2001).  J. F. Hiltner  and J. R. Sites.
	"Investigation of the Trapping Mechanism for Transient Current-Voltage Behavior In CIGSS-Based Solar Cells," Proc. Mat. Res. Soc. 668, H5.12.1-H5.12.6 (2001).  P. K. Johnson , J. R. Sites and D. E. Tarrant.

2000

	"Effects of Buffer Layers on SSI CIGSS-Absorber Transient I-V and C-V Behavior,"  Proc. IEEE Photovoltaic Specialists Conf. 28, 618-621 (2000).  P. K. Johnson, J. R. Sites, K. Ramanathan, L. Olsen, and D. Tarrant.
	"Precontact Surface Chemistry Effects on CdS/CdTe Solar Cell Performance and Stability," Proc. IEEE Photovoltaic Specialists Conf. 28, 583-586 (2000).  D. Albin, D. Levi, S. Asher, A. Balcioglu, R. Dhere, and J. F. Hiltner.
	"Local Photocurrent and Resistivity Measurements with Micron Resolution," Proc. IEEE Photovoltaic Specialists Conf. 28, 543-546 (2000).  J. F. Hiltner and J. R. Sites.
	"High Resolution Laser Stepping Measurements on Polycrystalline Solar Cells," Proc.  E-PVSEC 16,  650-653 (2000).  J. F. Hiltner and J. R. Sites.
	"CIS Carrier-Density Profiles Derived from Capacitance," NCPV Rev., 233-234 (2000).  P. K. Johnson and J. R. Sites.
	"15.4% CuIn1-x Gax Se2-based Photovoltaic Cells from Solution-based Precursor Films," Thin Solid Films 361-362, 396-399 (2000).  R. N. Bhattacharya, J. F. Hiltner, W. Batchelor, M. A. Contreras, R. Noufi, and J. R. Sites.

1998-1999

	"Critical Issues and Research Needs for CdTe Solar Cells," Electrochemical Society Proc. 99-11, 241 (1999).  J. R. Sites, A. D. Compaan, R. W. Birkmire, C. S. Ferekides, and A. F. Fahrenbruch.
	"Progress Toward 20% Efficiency in Cu(In,Ga) Se2 Polycrystalline Thin-Film Solar Cells," Prog. in Photovoltaics 7, 311 (1999).  M. A. Contreras.  B. Egaas, K. Ramanathan, J. Hiltner, A Swartzlander, F. Hasoon, and R. Noufi.
	"Thin-Film CuIn1-xGaxSe2  Photovoltaic Cells from Solution-based Precursor Layers," Appl. Phys. Lett. 75, 1431 (1999).  R.N. Bhattacharya, W. Batchelor, J. F. Hiltner, and J. R. Sites.
	"Losses Due to Polycrystallinity in Thin-Film Solar Cells," Solar Energy Mat. and Solar Cells 55, 43 (1998). J. R. Sites, J. E. Granata, and J. F. Hiltner.
	"Impact of Sodium in the Bulk and Grain Boundaries of CuInSe2," Proc. 2nd World PV Energy Conf., p. 604 (1998). J. E. Granata and J. R. Sites.
	"Stability of CdTe Solar-Cells at Elevated Temperatures: Voltage, Temperature, and Cu Dependence," AIP Conf. Series 462, 170 (1998). J. F. Hiltner and J. R. Sites.
	"Blue-Photon Modification of Nonstandard Barrier in CuInSe2 Solar Cells," Solar Energy Materials and Solar Cells 53, 367 (1998). I. L. Eisgruber. J. E. Granata, J. R. Sites, and J. Kessler.