Model for Staebler-Wronski Degradation Deduced from Long-Term, Controlled Light-Soaking Experiments

Research output: Contribution to conferencePaper


Long-term light-soaking experiments of amorphous silicon photovoltaic modules have now established that stabilization of the degradation occurs at levels that depend significantly on the operating conditions, as well as on the operating history of the modules. We suggest that stabilization occurs because of the introduction of degradation mechanisms with different time constants and annealingactivation energies, depending on the exposure conditions. Stabilization will occur once a sufficient accumulation of different degradation mechanisms occurs. We find that operating module temperature during light-soaking is the most important parameter for determining stabilized performance. Next in importance is the exposure history of the device. The precise value of the light intensity seemsleast important in determining the stabilized efficiency, as long as its level is a significant fraction of 1-sun.
Original languageAmerican English
Number of pages9
StatePublished - 2000
EventMaterials Research Society Spring Meeting - San Francisco, California
Duration: 24 Apr 200028 Apr 2000


ConferenceMaterials Research Society Spring Meeting
CitySan Francisco, California

NREL Publication Number

  • NREL/CP-520-28333


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