Temperature-Dependent Light-Stabilized States in Thin-Film PV Modules: Preprint

Research output: Contribution to conferencePaper


Thin-film photovoltaic modules are known to exhibit light-induced transient behavior which interferes with accurate and repeatable measurements of power. Typically power measurements are made after a light exposure in order to target a 'light state' of the module that is representative of outdoor performance. Here we show that the concept of a unique light state is poorly defined for both CIGS and CdTe modules. Instead we find that their metastable state after a light exposure can depend on the temperature of the module during the exposure. We observe changes in power as large as 5.8% for a 20 degrees C difference in light exposure temperature. These results lead us to conclude that for applications in which reproducibility and repeatability are critical, module temperature should be tightly controlled during light exposure.
Original languageAmerican English
Number of pages5
StatePublished - 2015
Event42nd IEEE Photovoltaic Specialists Conference - New Orleans, Louisiana
Duration: 14 Jul 201519 Jul 2015


Conference42nd IEEE Photovoltaic Specialists Conference
CityNew Orleans, Louisiana

NREL Publication Number

  • NREL/CP-5J00-64417


  • characterizations
  • light soak
  • measurement
  • metastability
  • photovoltaic
  • solar
  • thin films
  • transient


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