NDLI: Light soaking measurements of commercially available CIGS PV modules

Content Provider	IEEE Xplore Digital Library
Author	Dunn, L. Gostein, M.
Copyright Year	2012
Description	Author affiliation: Atonometrics, Inc., Austin, TX, 78757, USA (Dunn, L.; Gostein, M.)
Abstract	CIGS devices are known to exhibit metastabilities and performance changes with continuous light exposure, or light soaking (see Ref. [1], and references therein). Such metastabilities have an impact on the measurement of CIGS PV module performance, since efficiency and other parameters change on a time scale of hours. For this work we used an indoor continuous solar simulator to expose three commercially available CIGS modules from three different manufacturers to a simulated diurnal light exposure cycle for 16 days. We observed an initial increase in efficiency on the order of ∼3% to ∼5% at the start of each illumination cycle in all three modules. We also observed a a deviation of approximately −0.17%/°C between the measured value and data sheet value of one module's Pmax/efficiency temperature coefficient, indicating that this module have ∼5% lower power output at normal operating temperatures that indicated by the datasheet. In a follow-on experiment, the time required for modules to relax in the dark to their low-efficiency states was investigated by varying the length of time spent in the dark. One module, with an overall power conversion efficiency (PCE) of ∼9.3%, required between 2 and 3 hours in the dark to relax to its low efficiency state, while the other two modules, with PCEs of ∼10.3%, require between 9 and 16 hours to relax to their low-efficiency states.
Starting Page	001260
Ending Page	001265
File Size	1627095
Page Count	6
File Format	PDF
ISBN	9781467300643
ISSN	01608371
e-ISBN	9781467300667
DOI	10.1109/PVSC.2012.6317831
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature measurement Temperature distribution Performance evaluation Power conversion Temperature sensors Data mining solar power generation photovoltaic cells thin film devices
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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