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Unusual capacitance emission transients in CIGS caused by large defect entropy changes /

Capacitance transient data from bias-pulse experiments on CdS/CIGS solar cells show an unusual behavior at high temperatures. Above 350 K, a minority-carrier trap, with a larger activation energy than a majority-carrier trap, emits faster than the lower activation-energy minority trap. A simple enth...

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Bibliographic Details
Main Author: Young, David L.
Corporate Author: National Renewable Energy Laboratory (U.S.)
Other Authors: Ramanathan, Kannan, Crandall, Richard S.
Format: Government Document eBook
Language:English
Published: Golden, Colo. : National Renewable Energy Laboratory, [2005]
Series:Conference paper ; NREL/CP-520-37359
Subjects:
Solar cells > Materials > Effect of temperature on.
14 SOLAR ENERGY
42 ENGINEERING
ACTIVATION ENERGY
CAPACITANCE
DEFECTS
ENTHALPY
ENTROPY
FREE ENERGY
SOLAR CELLS
TRANSIENTS
SOLAR ENERGY
Online Access:https://purl.fdlp.gov/GPO/LPS69679
Description
Summary:Capacitance transient data from bias-pulse experiments on CdS/CIGS solar cells show an unusual behavior at high temperatures. Above 350 K, a minority-carrier trap, with a larger activation energy than a majority-carrier trap, emits faster than the lower activation-energy minority trap. A simple enthalpy model for trap emission cannot explain this counterintuitive behavior; but the more complete Gibbs free-energy model that includes entropy can explain it. We show that entropy plays a major role in carrier emission from traps in CIGS.
Item Description:"Prepared for the 31st IEEE Photovoltaics Specialists Conference and Exhibition, Lake Buena Vista, Florida, January 3-7, 2005."
Title from title screen (viewed on May 9, 2006).
"February 2005."
2005-08-21.
Electronic resource.
Physical Description:4 pages : digital, PDF file.
Format:Mode of access: Internet from the NREL web site. Address as of 5/9/06: http://www.nrel.gov/docs/fy05osti/37359.pdf ; current access available via PURL.