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Journal of Photonics for Energy

Metastable electrical characteristics of polycrystalline thin-film photovoltaic modules upon exposure and stabilization
Author(s): Chris Deline; Joseph A. del Cueto; David S. Albin; Steven Rummel
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Paper 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.

Paper Details

Date Published: 2 March 2012
PDF: 14 pages
J. Photon. Energy. 2(1) 022001 doi: 10.1117/1.JPE.2.022001
Published in: Journal of Photonics for Energy Volume 2, Issue 1
Show Author Affiliations
Chris Deline, National Renewable Energy Lab. (United States)
Joseph A. del Cueto, Abound Solar, Inc. (United States)
David S. Albin, National Renewable Energy Lab. (United States)
Steven Rummel, National Renewable Energy Lab. (United States)

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