NDLI: Optimizing CdTe Solar Cell Performance: Impact of Variations in Minority-Carrier Lifetime and Carrier Density Profile

Content Provider	IEEE Xplore Digital Library
Author	Kanevce, A. Gessert, T.A.
Copyright Year	2011
Abstract	Using numerical simulations, we study the combined effects of nonuniform minority-carrier lifetime τ and carrier density NA on device performance. In a uniformly doped device, maximum open-circuit voltage V_oc is obtained for high τ and high NA. The fill-factor (FF) is mainly dependent on the lifetime. When the lifetime is low, and NA is high, the FF suffers losses due to voltage-dependant carrier collection. For a low carrier density and low lifetime, the electric field strength is low, recombination is a competitive process to drift, and the FF is reduced. Simulations predict that it might be possible to increase the device efficiency with lower carrier density, if the back of the absorber is highly doped. This configuration increases the built-in potential and the electric field close to the junction region, while keeping the space-charge region wide. In addition, a device with such a profile is very tolerant toward lifetime variations of the highly doped layer. With our simulation parameters, when the absorber properties are uniform, efficiencies >;18% require experimentally unrealistic doping and lifetime values. If the back of the absorber is doped significantly higher than the rest, such efficiencies can be achieved with realistic values of doping and lifetime.
Starting Page	99
Ending Page	103
Page Count	5
File Size	547314
File Format	PDF
ISSN	21563381
Volume Number	1
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Charge carrier density Doping Photovoltaic cells Thyristors Charge carrier lifetime Photovoltaic systems thin films Carrier lifetime photovoltaic cells semiconductor device modeling
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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