(Publications listed here are since 2006. For full list please visit: https://www.engr.colostate.edu/faculty-staff/profile/?v=publications&p=81)

2016

Munshi, Amit; Kephart, Jason; Abbas, Ali; Shimpi, Tushar; Barth, Kurt; Walls, John; Sampath, W.S. “Effect of Varying Deposition Source and Substrate Temperature on CSS CdTe Thin-film Photovoltaics.” 2016 IEEE 43rd Photovoltaic Specialist Conference (PVSC). IEEE, 2016.

Dangate, Milind; Munshi, Amit; Sampath W.S.; Boltalina, Olga; Strauss, Steven; C. Saravanan; Nair, Shantikumar, “Investigation of Organic Small Molecules and Polymer Compounds for CdTe Back Contact.” 2016 IEEE 43rd Photovoltaic Specialist Conference (PVSC). IEEE, 2016.

Reich, Carey; Swanson, Drew; Shimpi, Tushar; Drayton, Jennifer; Munshi, Amit; Abbas, Ali; Sampath W.S., “Passivation of a Cd1-xMgxTe Absorber for Application in a Tandem Cell” 2016 IEEE 43rd Photovoltaic Specialist Conference (PVSC). IEEE, 2016.

Sites, James; Munshi, Amit; Kephart, Jason; Swanson, Drew and Sampath W.S. “Progress and Challenges with CdTe Cell Efficiency” Invited Talk, 2016 IEEE 43rd Photovoltaic Specialist Conference (PVSC). IEEE, 2016.

T. M. Shimpi, J. M. Kephart, D. E. Swanson, A. H. Munshi, W. S. Sampath, A. Abbas, J. M. Walls, “Effect of the cadmium chloride treatment on RF sputtered Cd0:6Zn0:4Te films for application in multijunction solar cells,” Journal of Vacuum Science & Technology A, vol. 34, no. 5, p. 051202, Sep. 2016.

Properties of Zinc Telluride Films Doped with Nitrogen used as a Back Contact to Cadmium Telluride Photovoltaics Tushar M. Shimpi, Jennifer Drayton, Drew E. Swanson, Walajabad S. Sampath (Anticipated submission date 09-31-2016).

M. Kephart, Z. Ma, J. M. McCamy, A. Ganjoo, F. M. Alamgir, and W. S. Sampath, “Band alignment of Front Contact Layers for high-efficiency CdTe solar cells,” Solar Energy Materials & Solar Cells, vol. 157, pp. 266-275, Dec. 2016.

Munshi, A; and W. S. Sampath; “CdTe Photovoltaics (PV) for sustainable generation of electricity”, invited talk at II VI workshop Chicago, Oct. 7, 2015, and Asian Institute of Technology, March 2016, published in the Journal of Electronic Materials; published in the. Journal of Electronic Materials. 2016 Apr:1-8.

J.M. Kephart, J.M. McCamy, Z. Ma, A. Ganjoo, F.M. Alamgir, W.S. Sampath; “Band alignment in the design of HRT and window layers for high-efficiency CdTe thin-film solar cells” to be published in Solar Energy Materials and solar cells 2016

Drew E. Swanson, Jason M. Kephart, Pavel S. Kobyakov, Kevin Walters, Kevan C. Cameron, Kurt L. Barth, Walajabad S. Sampath, Jennifer Drayton, James R. Sites, Single vacuum chamber with multiple close space sublimation sources to fabricate CdTe solar cells, Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 2016, 34, 2, 021202

2015

Kephart, Jason M., Russell M. Geisthardt, and W. S. Sampath. “Optimization of CdTe thin‐film solar cell efficiency using a sputtered, oxygenated CdS window layer.” Progress in Photovoltaics: Research and Applications, 23, 1484-1492, (2015).

A.Abbas, D. Swanson, A. Munshi, K.L. Barth, W.S. Sampath, G.D West, J.W. Bowers, P.M. Kaminski, and J.M. Walls; “The Effect of a Post-Activation Annealing Treatment on Thin Film CdTe Device Performance” presented at 42nd IEEE PVSC, June 2015, published in the proceedings of the conference.

A. Abbas, G. D. West, J.W. Bowers, P. M. Kaminski, J.M. Walls, Kurt L. Barth, W.S. Sampath; “Cadmium Chloride Assisted Re-Crystallisation of CdTe: The Effect on the CdS Window Layer”published in the 2014 MRS Fall Meeting proceedings.

Sampath, W. S., P. S. Kobyakov, K. E. Walters, J. M. Kephart and D. R. Hemenway; “Process and Hardware for Deposition of Complex Thin-Film Alloys over Large Areas”, US Patent 8,778,081 awarded 2015.

Sampath, W. S., P. S. Kobyakov, K. E. Walters, J. M. Kephart and D. R. Hemenway; “Process and Hardware for Deposition of Complex Thin-Film Alloys over Large Areas”, US Patent 8956698 awarded 2015.

Drew E. Swanson, Ali Abbas, Amit Munshi, Jennifer Drayton, John M. Raguse, Russell Geisthardt, Jim R. Sites, and Walajabad S. Sampath, “Investigation of Material Challenges for Cd1-xMgxTe as an Electron Reflector in Cadmium Telluride Photovoltaic Cells” MRS meeting spring 2015

Duncan, Douglas; Kephart, Jason; Horsley, Kimberly; Blum, Monika; Mezher, Michelle; Weinhardt, Lothar; Haeming, Marc; Wilks, Regan; Hofmann, Timo; Yang, Wanli; Baer, Marcus; Sampath, Walajabad; Heske, Clemens; “Characterization of sulfur bonding in CdS:O buffer layers for CdTe-based thin-film solar cells” Accepted for publication in ACS Applied Materials and interface Manuscript ID: am-2015- 035039.,

J.M. Kephart, J.M. McCamy, Z. Ma, A. Ganjoo, F.M. Alamgir, W.S. Sampath; “Band alignment in the design of HRT and window layers for high-eciency CdTe thin-film solar cells” Submitted to Solar Energy Materials and solar cells 2015.

Jason M. Kephart& W.S. Sampath; “Gallium-doped Magnesium Zinc Oxide (GMZO) Transparent Conducting Oxide Layers for CdTe Thin-film Photovoltaics” presented at 42nd IEEEE PVSC, June 2015, published in the proceedings of the conference.

Davis Hemenway, Anthony Nicholson, Kurt Barth, Walajabad Sampath; “Using Computational Simulation to Model CdS/CdTe Processing in Close-Space Sublimation” presented at 42nd IEEEE PVSC, June 2015, published in the proceedings of the conference.

K. C. Long 1, W. S. Duff , J. W. Labadie, M. J. Stansloski, W S. Sampath, E. K.P. Chong, “Multi-objective Fatigue Life Optimization using Tabu Genetic Algorithms”, accepted by International Journal of Structural Integrity. May, 2015.

2014

A. Abbas, G.D West , J.W. Bowers, P. M. Kaminski1, B. Maniscalco, J.M. Walls, K.L. Barth and W.S. Sampath (2014). Cadmium Chloride Assisted Re-Crystallization of CdTe: The effect of annealing over-treatment. 40th IEEE Photovoltaics Specialists Conference. Denver, Colorado.

D. R. Hemenway, W. Sampath, H. Sakurai, K. L. Barth (2014). Thermal Modeling of PV Modules Using Computational Simulation. 40th IEEE Photovoltaics Specialists Conference. Denver, Colorado.

A. H. Munshi, A. Abbas, J. Raguse, K. L. Barth, W. S. Sampath, J. M. Walls (2014). Effect of Varying Process Parameters on CdTe Thin Film Device Performance and Its Relationship to Film Microstructure. 40th IEEE Photovoltaics Specialists Conference. Denver, Colorado.

D. A. Hanks, P. Kobyakov, S. Alexander, J. H. Alsemier, K. Horsley, M. Hamming, M. Blum, R. G. Wilks, L. Weinhardt, M. Bar, W. S. Sampath and C. Heske (2013). Characterization of the Deeply Buried CdS/SnOx:F Interface in CdTe Thin Film Solar Cells. 2013 Fall MRS Meeting.

Drew E. Swanson, Russell M. Geisthardt, Pavel S. Kobyakov, John M. Raguse, Jennifer Drayton, James. R. Sites, Walajabad S. Sampath. (2014). Reduction of Carrier Recombination in CdTe Solar Cells by the Addition of a Cd1-xMgxTe Electron Reflector Film. 40th IEEE Photovoltaics Specialists Conference. Denver, Colorado.

Drew E. Swanson, Russell M. Geisthardt, Pavel S. Kobyakov, John M. Raguse, Jennifer Drayton, James. R. Sites, Walajabad S. Sampath. (2014). Drew E. Swanson, Russell M. Geisthardt, Pavel S. Reduction of Carrier Recombination in CdTe Solar Cells by the Addition of a Cd1-xMgxTe Electron Reflector Film. Journal of Photovoltaics.

J. M. Kephart, R. M. Geisthardt, W. S. Sampath (2014). Optimization of CdTe Thin Film Solar Cell Efficiency using a Sputtered, Oxygenated CdS Window Layer. Progress in Photovoltaics.

P. S. Kobyakov, A. Abbas, D. E. Swanson, J. M. Raguse, J. Dayton, J. M. Walls, J. R. Sites and W. S. Sampath (). Grain-Level Epitaxial Growth of CdMgTe Thin Films onto Polycrystalline CdS/CdTe Solar Cells for Electron Reflector Applications. Solar Energy Materials and Solar Cells.

P. S. Kobyakov, A. M. Moore, J. M. Raguse, D. E. Swanson and W. S. Sampath (2014). Deposition and Characterization of Cd1-xMgxTe Thin Films Grwon by a Novel Co-sublimation Method. Journal of Vacuum Science and Technology.

2013

D. Swanson, S. Hafner, W. Sampath, et. al. (2013). Development of Plasma Enhanced Closed Space Sublimation for the Deposition of CdS:O in CdTe Solar Cells. IEEE Photovoltaics Specialists Conference, 2013. Tampa, Florida. Paper Presentation.

Superstrate Design for Increased CdS/CdTe Solar Cell Efficiencies (2013). J. McCamy, Z. Ma, J. Kephart, W. S. Sampath, et. al. (2013). IEEE Photovoltaics Specialists Conference 2013. Tampa, Florida. Paper Presentation.

P. Kobyakov, D. Swanson. J. Drayton, W. S. Sampath, et. al. (2013). Progress Towards a CdS/CdTe Solar Cell Implementing an Electron Reflector. IEEE Photovoltaics Specialists Conference, 2013. Tampa, Florida. Paper Presentation.

J. Kephart, R. Geisthardt, Z. Ma, W. S. Sampath, et. al. (2013). Reduction of Window Layer Optical Losses in CdS/CdTe Solar Cells Using a Float-Line Manufacturable HRT Layer. IEEE Photovoltaics Specialists Conference, 2013. Tampa, Florida. Paper Presentation.

A. Abbas, M. Walls, G. West, W. S. Sampath, et. al. (2013). Cadmium Chloride Assisted Re-Crystallization of CdTe: The Effect of the Annealing Temperature. IEEE Photovoltaics Specialists Conference, 2013. Tampa, Florida. Paper Presentation.

A. Abbas, G. West, W. S. Sampath, et. al. (2013). Cadmium Chloride Assisted Recrystallization of CdTe: The Effect of Varying the Annealing Time. MRS Fall Meeting 2013. Boston, Massachusetts. Paper Presentation.

Abbas, A.; West, G. D.; Bowers, J.W.; Isherwood, P.; Kaminski, P. M.; Maniscalco, B.; Rowley, P.; Walls, J. M.; Barricklow, K.; Sampath, W.S.; Barth, K. L.; “The Effect of Cadmium Chloride Treatment on Close-Spaced Sublimated Cadmium Telluride Thin-Film Solar Cells,” Photovoltaics, IEEE Journal of, vol.PP, no.99,pp1,6,0. Doi: 10.1109/JPHOTOV.2013.2264995.

URL: http://ieeeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6531632&isnumber-5986669

2012

“Growth and Characterization of Cd1-xMgxTe Thin Films for Possible Application in High Efficiency Solar Cells,” Pavel S. Kobyakov, Russell Geisthardt, Tyler Cote and W. S. Sampath. Proc. IEEE PVSC-38, P2.57 (2012), published in the proceedings of the conference. Paper Presentation.

“Eleminating Pinholes in CSS Deposited CdS Films,” Mohanned Tashkandi and W. S. Sampath. Proc. IEEE PVSC-38, (2012)., Paper Presentation.

J. M. Walls, A. Abbas, G. D. West, J. W. Bowers, P. J. M. Isherwood, P. M. Kaminski, B. Maniscalco,     W.S. Sampath and K. L. Barth, “The Effect of Anneal Treatment on Close Spaced Sublimated Cadmium Telluride Thin Film Solar Cells”, presented at 2012 Fall MRS meeting, published in the proceedings of the conference.

A. Abbas, G. D. West, J. W. Bowers, P. J. M. Isherwood, P. M. Kaminski, B. Maniscalco, J. M. Walls,     W.S. Sampath and K. L. Barth, “The Effect of Cadmium Chloride Treatment on Close Spaced Sublimated Cadmium Telluride Thin Film Solar Cells”, Proc. IEEE PVSC-38, P2.57 (2012, also to be published in Journal of Photovoltaics.), Paper Presentation.

D. Hanks, M. Weir, K. Horsley, T. Hofmann, L. Weinhardt, M. Bär, K. Barricklow, P. Kobyakov, W. Sampath and C. Heske,” Photoemission Study of CdTe Surfaces After Low Energy Ion Treatment,” presented at IEEE Photovoltaics Specialists Conference (PVSC), June 2012, Austin, Texas.

“Advancing the Manufacturing of CdTe Modules,” W. S. Sampath, IEEE Photovoltaics Specialists Conference. 38, O2.526, Austin, June 5, 2012, Published in the Proceedings of the Conference.

“Plasma Cleaning of TCO Surface Prior to CdS/CdTe Deposition,” D.E Swanson, R.M. Lutz, W.S. Sampath and J.D. Williams, Proc. IEEE PVSC-38, P2.237 (2012), published in the proceedings of the conference. Paper presentation.

“Sputtered Oxygenated CdS Window Layer for Higher Current in CdS/CdTe Solar Cells,” J. M. Kephart, R.Geisthardt and W. S. Sampath, IEEE PVSC-38, P2.236 (2012), published in the proceedings of the conference. Paper presentation.

2011

Kephart J.M. and Sampath W.S; “Optical Measurement Techniques for in-line Process Control in CdS/CdTe Solar Cells”; Proceedings of the 37th IEEE PVSC Conference, June 2011., Paper Presentation.

Kobyakov P.S., Kephart K. M. and Sampath W. S.; “Sublimation of Mg onto CdS/CdTe Films Fabricated by Advanced Deposition System; Proceedings of the 37th IEEE PVSC Conference, June 2011., Paper Presentation.

Tashkandi M.A., and Sampath W.S.; “Morphology of CdS Films: Pinholes and their Effects on Open Circuit Voltage”; Proceedings of the 37th IEEE PVSC Conference, June 2011., Paper Presentation.

2008

Microstructural features of CdTe PV thin film devices, V.Manivannan, R.A.Enzenroth, K.L.Barth, S.Kohli, P.R.McCurdy and W.S.Sampath, Thin Solid Films, 516(2008) 1209-1213.

Effect of hail impact on thermally tempered glass substrates used for processing CdTe PV modules, T.M.Shimpi, K.L.Barth, R.A.Enzenroth, W.S.Sampath and V.Manivannan, J. of testing and eveluation, Vo. 36, No. 2, (2008), 1-6.

2007

Measurement of cooling rates of a superstrate cooling apparatus for an integrated in-line manufacturing process for thin film photovoltaic devices, R.A.Enzenroth, K.L.Barth, W.S.Sampath and V.Manivannan, JVST, A 25(2), Mar. Apr 2007, L9-L11.

Performance of in-line manufactured CdTe thin film photovoltaic technology, R.A.Enzenroth, K.L.Barth, W.S.Sampath and V.Manivannan, J. of Solar Energy Eng., Vol. 129, 2007, 327-330.

Thermal model for a superstrate cooling apparatus for integrated in-line manufacturing process for thin film photovoltaic devices, R.A.Enzenroth, K.L.Barth, W.S.Sampath and V.Manivannan, JVST, B, Vol. 25, No.6, 2007, 4.

2006

Enzenroth, R. A., K.L. Barth, and W. S. Sampath, “Correlation of Stability to Varied CdCl2 Treatment and Related Defects in CdS/CdTe PV Devices as Measured by Thermal Admittance Spectroscopy”, J. Phys. Chem. Solids, In Press.

2005

Malhotra, C. P., Mahajan, R. L., Sampath, W. S., Barth, K. L., Enzenroth, R. A., “Control of Temperature Uniformity during the Manufacture of Stable Thin-Film Photovoltaic Devices”, submitted to International Journal of Heat and Mass Transfer in March 2005

Enzenroth, R. A., K.L. Barth, and W. S. Sampath, “Correlation of Stability to Varied CdCl2 Treatment and Related Defects in CdS/CdTe PV Devices as Measured by Thermal Admittance Spectroscopy”, J. Phys. Chem. Solids, In Press.

Referred Conference Proceedings

2008

Sampath, W. S; et. al; Advances in Continuous In-Line Processing of Stable CdS/CdTe Devices, 33rd IEEE Specialists Conference, May 2008

2004

Malhotra, C. P., Mahajan, R. L., Sampath, W. S., Barth, K. L., Enzenroth, R. A., “Control of temperature uniformity during the manufacture of stable thin-film photovoltaic devices”, Proceedings of IMECE 2004: ASME International Mechanical Engineering Congress, Anaheim, CA, November 13–19, 2004

Other (e.g.: Lab Texts, Book Reviews, Technical Reports, In-House Reports)

2008

Sampath, et. al; Continuous In-Line Processing of CdS/CdTe Solar Cells, Invited Talk, American Vacuum Society, Bostin, October 2008

2007

W.S.Sampath, Mass Production of CdTe Solar Photovoltaics”, Presentation to Colorado chapter of IEEE, Jan. 17, 2007.

W.S.Sampath, “Advancing CdTe Thin Film PV Manufacturing”, DOE SAI Incubator Program, November 2007.

2006

Malhotra, C. P., Mahajan, R. L., Sampath, W. S., Barth, K. L., Enzenroth, R. A., “Prediction of Spatial Evolution of Temperature across Substrates during the Deposition Process for Manufacturing large area CdTe Photovoltaic panels,” submitted to IHTC-13: 13th International Heat Transfer Conference, Sydney, Australia, August 13-18, 2006