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Special Section on Reliability of Photovoltaic Cells, Modules, Components, and Systems

Metastable electrical characteristics of polycrystalline thin-film photovoltaic modules upon exposure and stabilization

[+] Author Affiliations
Chris Deline, David S. Albin, Steve Rummel

National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401

Joseph del Cueto

National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401

Abound Solar, 3755 Precision Drive, Suite 180, Loveland, Colorado 80538

J. Photon. Energy. 2(1), 022001 (Mar 02, 2012). doi:10.1117/1.JPE.2.022001
History: Received September 26, 2011; Revised November 1, 2011; Accepted November 2, 2011
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Abstract.  The significant features of a series of stabilization experiments conducted at the National Renewable Energy Laboratory (NREL) between May 2009 and the present are reported. These experiments evaluated a procedure to stabilize the measured performance of thin-film polycrystalline cadmium telluride (CdTe) and copper indium gallium diselenide (CIGS) thin-film photovoltaic (PV) modules. The current-voltage (I-V) characteristics of CdTe and CIGS thin-film PV devices and modules exhibit transitory changes in electrical performance after thermal exposure in the dark and/or bias and light exposures. We present the results of our case studies of module performance versus exposure: light soaked at 65°C; exposed in the dark under forward bias at 65°C; and, finally, longer-term outdoor exposure. We find that stabilization can be achieved to varying degrees using either light-soaking or dark-bias methods and that the existing IEC 61646 light-soaking interval may be appropriate for CdTe and CIGS modules with one caveat: it is likely that at least three exposure intervals are required for stabilization.

Figures in this Article
© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Chris Deline ; Joseph del Cueto ; David S. Albin and Steve Rummel
"Metastable electrical characteristics of polycrystalline thin-film photovoltaic modules upon exposure and stabilization", J. Photon. Energy. 2(1), 022001 (Mar 02, 2012). ; http://dx.doi.org/10.1117/1.JPE.2.022001


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