Metastable Changes to the Temperature Coefficients of Thin-Film Photovoltaic Modules

Research output: Contribution to conferencePaper


Transient changes in the performance of thin-film modules with light exposure are a well-known and widely reported phenomenon. These changes are often the result of reversible metastabilities rather than irreversible changes. Here we consider how these metastable changes affect the temperature dependence of photovoltaic performance. We find that in CIGS modules exhibiting a metastable increase inperformance with light exposure, the light exposure also induces an increase in the magnitude of the temperature coefficient. It is important to understand such changes when characterizing temperature coefficients and when analyzing the outdoor performance of newly installed modules.
Original languageAmerican English
Number of pages4
StatePublished - 2014
Event40th IEEE Photovoltaic Specialists Conference - Denver, Colorado
Duration: 8 Jun 201413 Jun 2014


Conference40th IEEE Photovoltaic Specialists Conference
CityDenver, Colorado

NREL Publication Number

  • NREL/CP-5J00-61264


  • CIGS
  • light-soak
  • metastability
  • photovoltaic
  • temperature coefficients
  • transient


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