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

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.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
1225492
Report Number(s):
NREL/CP-5J00-64417
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: 42nd IEEE Photovoltaic Specialists Conference (PVSC 2015);New Orleans, Louisiana; -
Research Org:
NREL (National Renewable Energy Laboratory (NREL)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy Solar Energy Technologies Office (EE-4S)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE Metastability; transient; photovoltaic; solar; light soak; thin film; characterization; measurement