NDLI: The Limited Relevance of SWE Dangling Bonds to Degradation in High-Quality a-Si:H Solar Cells

Content Provider	IEEE Xplore Digital Library
Author	Wronski, C.R. Xinwei Niu
Copyright Year	2011
Abstract	Contributions of different light-induced defect states to degradation of solar cells have been established for high-quality p-i-n solar cells with i layers of protocrystalline a-Si:H deposited at very low rates, whose nanostructure is dominated by hydrogen-passivated divacancies. Nature of the different light-induced gap states and their respective roles as electron and hole recombination centers were characterized in the thin films from their photocurrents, and in corresponding solar cells from their Shockley-Reed-Hall carrier recombination currents. The results were directly related to three light-induced states, with “A” and “B” within 0.2 eV and “C” 0.4 eV below midgap, identified from subgap absorption. The A and B states are efficient electron, while the C states are very efficient hole recombination centers. Under 1-sun illumination, the former dominate the electron lifetimes, while the latter are key to solar cell operation as is confirmed by the direct correlation of their creation with the degradation of VOC and 1-sun fill factor (FF). It is also shown that the apparent correlation found earlier between the cell FF and electron lifetimes is due to the same long-term degradation kinetics of the light-induced changes in the B t and C states.
Starting Page	778
Ending Page	784
Page Count	7
File Size	477339
File Format	PDF
ISSN	21563381
Volume Number	4
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Degradation Photovoltaic cells Lighting Spontaneous emission Photoconductivity Sun Annealing thin films Amorphous silicon defect states light-induced degradation photovoltaic cells
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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