NDLI: Temperature dependence of VOC in CdTe and Cu(InGa)(SeS)2-based solar cells

Content Provider	IEEE Xplore Digital Library
Author	Thompson, Christopher P. Hegedus, Steven Shafarman, William Desai, Darshini
Copyright Year	2008
Description	Author affiliation: Institute of Energy Conversion, University of Delaware, Newark, 19716, USA (Thompson, Christopher P.; Hegedus, Steven; Shafarman, William; Desai, Darshini)
Abstract	The temperature and intensity dependence of VOC in CdTe and Cu(InGa)(SeS) polycrystalline thin film solar cells was examined. VOC was measured from 100–330K and from 0.1 to 1 sun illumination. Two distinct regimes of temperature dependence are commonly observed: a linear regime at higher temperatures with slope −0.5 to −3 mV/K and a logarithmic intensity dependence; and a saturation regime at lower temperatures, with little intensity or temperature dependence. The T=0 K intercept extrapolated from the linear regime around 300K is related to the activation energy of the dominant recombination mechanism and is equal to the absorber bandgap for Shockley-Read-Hall recombination, or in some cases, from heterojunction interface recombination, which is less than the absorber bandgap. In this work, the temperature dependence of VOC will be characterized for CdTe and Cu(InGa)Se devices with differences in composition and processing conditions. Analysis will focus on the activation energy of the recombination mechanism and saturation at lower temperatures which indicates a maximum separation of the quasi Fermi levels as thermally activated SRH recombination is frozen out. The saturation voltage is ∼1 V for a typical CdTe device (E=1.45 eV), ∼1V for low bandgap Cu(InGa)Se (E=1.15), and ∼1.1 V for wider bandgap Cu(InGa)Se (E=1.38 eV).
Starting Page	1
Ending Page	6
File Size	7812386
Page Count	6
File Format	PDF
ISBN	9781424416400
ISSN	01608371
DOI	10.1109/PVSC.2008.4922548
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature dependence Photovoltaic cells Lighting Photonic band gap Glass Voltage Diodes Circuits Equations Temperature measurement
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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