Optimization of CdTe thin‐film solar cell efficiency using a sputtered, oxygenated CdS window layer
Abstract
Abstract A major source of loss in cadmium sulfide/cadmium telluride (CdS/CdTe) solar cells results from light absorbed in the CdS window layer, which is not converted to electrical current. This film can be made more transparent by oxygen incorporation during sputter deposition at ambient temperature. Prior to this work, this material has not produced high‐efficiency devices on tin oxide‐coated soda‐lime‐glass substrates used industrially. Numerous devices were fabricated over a variety of process conditions to produce an optimized device. Although the material does not show a consistent increase in band gap with oxygenation, absorption in this layer can be virtually eliminated over the relevant spectrum, leading to an increase in short‐circuit current. Meanwhile, fill factor is maintained, and open‐circuit voltage increases relative to baseline devices with sublimated CdS. The trend of device parameters with oxygenation and thickness is consistent with an increasing conduction band offset at the window/CdTe interface. Optimization considering both initial efficiency and stability resulted in a National Renewable Energy Laboratory verified 15.2%‐efficient cell on 3.2‐mm soda‐lime glass. This window material was shown to be compatible with SnO 2 ‐based transparent conducting oxide and high resistance transparent coated substrates using in‐line compatible processes. Copyright © 2015 John Wiley &more »
- Authors:
-
- Colorado State University Mechanical Engineering Fort Collins CO USA
- Colorado State University Physics Fort Collins CO USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1401119
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Progress in Photovoltaics
- Additional Journal Information:
- Journal Name: Progress in Photovoltaics Journal Volume: 23 Journal Issue: 11; Journal ID: ISSN 1062-7995
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Kephart, Jason M., Geisthardt, Russell M., and Sampath, W. S. Optimization of CdTe thin‐film solar cell efficiency using a sputtered, oxygenated CdS window layer. United Kingdom: N. p., 2015.
Web. doi:10.1002/pip.2578.
Kephart, Jason M., Geisthardt, Russell M., & Sampath, W. S. Optimization of CdTe thin‐film solar cell efficiency using a sputtered, oxygenated CdS window layer. United Kingdom. https://doi.org/10.1002/pip.2578
Kephart, Jason M., Geisthardt, Russell M., and Sampath, W. S. Wed .
"Optimization of CdTe thin‐film solar cell efficiency using a sputtered, oxygenated CdS window layer". United Kingdom. https://doi.org/10.1002/pip.2578.
@article{osti_1401119,
title = {Optimization of CdTe thin‐film solar cell efficiency using a sputtered, oxygenated CdS window layer},
author = {Kephart, Jason M. and Geisthardt, Russell M. and Sampath, W. S.},
abstractNote = {Abstract A major source of loss in cadmium sulfide/cadmium telluride (CdS/CdTe) solar cells results from light absorbed in the CdS window layer, which is not converted to electrical current. This film can be made more transparent by oxygen incorporation during sputter deposition at ambient temperature. Prior to this work, this material has not produced high‐efficiency devices on tin oxide‐coated soda‐lime‐glass substrates used industrially. Numerous devices were fabricated over a variety of process conditions to produce an optimized device. Although the material does not show a consistent increase in band gap with oxygenation, absorption in this layer can be virtually eliminated over the relevant spectrum, leading to an increase in short‐circuit current. Meanwhile, fill factor is maintained, and open‐circuit voltage increases relative to baseline devices with sublimated CdS. The trend of device parameters with oxygenation and thickness is consistent with an increasing conduction band offset at the window/CdTe interface. Optimization considering both initial efficiency and stability resulted in a National Renewable Energy Laboratory verified 15.2%‐efficient cell on 3.2‐mm soda‐lime glass. This window material was shown to be compatible with SnO 2 ‐based transparent conducting oxide and high resistance transparent coated substrates using in‐line compatible processes. Copyright © 2015 John Wiley & Sons, Ltd},
doi = {10.1002/pip.2578},
journal = {Progress in Photovoltaics},
number = 11,
volume = 23,
place = {United Kingdom},
year = {Wed Jan 21 00:00:00 EST 2015},
month = {Wed Jan 21 00:00:00 EST 2015}
}
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Works referenced in this record:
Research Leading to High Throughput Manufacturing of Thin-Film CdTe PV Modules: Annual Subcontract Report, September 2004--September 2005
report, April 2006
- Powell, R. C.
Theoretical analysis of the effect of conduction band offset of window/CIS layers on performance of CIS solar cells using device simulation
journal, March 2001
- Minemoto, Takashi; Matsui, Takuya; Takakura, Hideyuki
- Solar Energy Materials and Solar Cells, Vol. 67, Issue 1-4
The effect of high-resistance SnO[sub 2] on CdS/CdTe device performance
conference, January 1999
- Li, X.; Ribelin, R.; Mahathongdy, Y.
- National center for photovoltaics (NCPV) 15th program review meeting, AIP Conference Proceedings
Local environment surrounding S and Cd in CdS:O thin film photovoltaic materials probed by x-ray absorption fine structures
journal, September 2006
- Soo, Y. L.; Sun, W. H.; Weng, S. C.
- Applied Physics Letters, Vol. 89, Issue 13
Modelling polycrystalline semiconductor solar cells
journal, February 2000
- Burgelman, M.; Nollet, P.; Degrave, S.
- Thin Solid Films, Vol. 361-362
Strategies to increase CdTe solar-cell voltage
journal, May 2007
- Sites, James; Pan, Jun
- Thin Solid Films, Vol. 515, Issue 15, p. 6099-6102
Improved CdTe Solar-Cell Performance by Plasma Cleaning the TCO Layer
journal, April 2013
- Swanson, Drew E.; Geisthardt, Russell M.; McGoffin, J. Tyler
- IEEE Journal of Photovoltaics, Vol. 3, Issue 2
CBD-Cd1−xZnxS thin films and their application in CdTe solar cells
journal, March 2004
- Zhou, J.; Wu, X.; Teeter, G.
- physica status solidi (b), Vol. 241, Issue 3
Enhancing the performance of solar cells via luminescent down-shifting of the incident spectrum: A review
journal, August 2009
- Klampaftis, Efthymios; Ross, David; McIntosh, Keith R.
- Solar Energy Materials and Solar Cells, Vol. 93, Issue 8
The direct correlation of CDTE solar cell stability with mobile ion charge generation during accelerated lifetime testing
conference, June 2009
- Albin, D. S.; Dhere, R. G.; Glynn, S. C.
- 2009 34th IEEE Photovoltaic Specialists Conference (PVSC)
Continuous in-line processing of CdS/CdTe devices: Process control using XRF and efficient heating
conference, June 2010
- Kobyakov, Ps; Schuh, N.; Walters, K.
- 2010 35th IEEE Photovoltaic Specialists Conference (PVSC)
Sputtered, oxygenated CdS window layers for higher current in CdS/CdTe thin film solar cells
conference, June 2012
- Kephart, Jason M.; Geisthardt, Russell; Sampath, W. S.
- 2012 IEEE 38th Photovoltaic Specialists Conference (PVSC), 2012 38th IEEE Photovoltaic Specialists Conference
Evaluation of the CdS/CdTe interface using free-electron laser internal photoemission technique
journal, June 1997
- Nishi, Kazuhisa; Ohyama, Hideaki; Suzuki, Toshiji
- Applied Physics Letters, Vol. 70, Issue 26
Reduction of window layer optical losses in CdS/CdTe solar cells using a float-line manufacturable HRT layer
conference, June 2013
- Kephart, Jason M.; Geisthardt, Russell M.; Ma, Zhixun
- 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC)
Stabilizing CdTe/CdS Solar Cells with Cu-Containing Contacts to p-CdTe
journal, September 2001
- Dobson, K. D.; Visoly-Fisher, I.; Hodes, G.
- Advanced Materials, Vol. 13, Issue 19
Utilization of sputter depth profiling for the determination of band alignment at polycrystalline CdTe/CdS heterointerfaces
journal, September 2002
- Fritsche, J.; Schulmeyer, T.; Kraft, D.
- Applied Physics Letters, Vol. 81, Issue 12
Quantification of losses in thin-film polycrystalline solar cells
journal, January 2003
- Sites, J.
- Solar Energy Materials and Solar Cells, Vol. 75, Issue 1-2
Effect of window layer composition in Cd 1− x Zn x S/CdTe solar cells : Effect of window layer composition
journal, August 2012
- Kartopu, Giray; Clayton, Andrew J.; Brooks, William S. M.
- Progress in Photovoltaics: Research and Applications, Vol. 22, Issue 1
Structure and optical properties of CdS:O thin films
journal, May 2013
- Asaba, Ryo; Wakita, Kazuki; Kitano, Atsushi
- physica status solidi (c), Vol. 10, Issue 7-8
Nanostructured CdS:O film: preparation, properties, and application
journal, March 2004
- Wu, X.; Yan, Y.; Dhere, R. G.
- physica status solidi (c), Vol. 1, Issue 4
Copper inclusion and migration from the back contact in CdTe solar cells
journal, March 2004
- Corwine, C.
- Solar Energy Materials and Solar Cells
Using the Correct Statistical test for the Equality of Regression Coefficients
journal, November 1998
- Paternoster, Raymond; Brame, Robert; Mazerolle, Paul
- Criminology, Vol. 36, Issue 4
Processing options for CdTe thin film solar cells
journal, December 2004
- McCandless, Brian E.; Dobson, Kevin D.
- Solar Energy, Vol. 77, Issue 6
Cu(In,Ga)Se2 solar cells with controlled conduction band offset of window/Cu(In,Ga)Se2 layers
journal, June 2001
- Minemoto, Takashi; Hashimoto, Yasuhiro; Satoh, Takuya
- Journal of Applied Physics, Vol. 89, Issue 12
Opportunities and challenges for a sustainable energy future
journal, August 2012
- Chu, Steven; Majumdar, Arun
- Nature, Vol. 488, Issue 7411, p. 294-303
Enhancing blue photoresponse in CdTe photovoltaics by luminescent down-shifting using semiconductor quantum dot/PMMA films
journal, January 2013
- Hodgson, Simon D.; Brooks, William S. M.; Clayton, Andrew J.
- Nano Energy, Vol. 2, Issue 1
Oxygenated CdS Window Layer for Sputtered CdS/CdTe Solar Cells
journal, January 2003
- Gupta, Akhlesh; Allada, Karthikeya; Lee, Sung Hyun
- MRS Proceedings, Vol. 763
The effect of oxygen on interface microstructure evolution in CdS/CdTe solar cells
journal, January 2002
- Albin, D. S.; Yan, Y.; Al-Jassim, M. M.
- Progress in Photovoltaics: Research and Applications, Vol. 10, Issue 5
Initial and degraded performance of thin film CdTe solar cell devices as a function of copper at the back contact
journal, August 2011
- Korevaar, B. A.; Shuba, R.; Yakimov, A.
- Thin Solid Films, Vol. 519, Issue 21
Interface recombination in heterojunction solar cells: Influence of buffer layer thickness
journal, April 2011
- Wilhelm, Helena; Schock, Hans-Werner; Scheer, Roland
- Journal of Applied Physics, Vol. 109, Issue 8