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Properties of CuIn1-xGaxSe2 films prepared by the rapid thermal annealing of spray-deposited CuIn1-xGaxS2 and Se

Published online by Cambridge University Press:  19 July 2011

Laura E. Slaymaker ,
Nathan M. Hoffman ,
Matthew A. Ingersoll ,
Matthew R. Jensen ,
Jiří Olejníček ,
Christopher L. Exstrom ,
Scott A. Darveau ,
Rodney J. Soukup ,
Natale J. Ianno  and
Amitabha Sarkar
...Show all authors
Laura E. Slaymaker
Affiliation:
Department of Chemistry, University of Nebraska at Kearney, Kearney, NE 68849, U.S.A.
Nathan M. Hoffman
Affiliation:
Department of Chemistry, University of Nebraska at Kearney, Kearney, NE 68849, U.S.A.
Matthew A. Ingersoll
Affiliation:
Department of Chemistry, University of Nebraska at Kearney, Kearney, NE 68849, U.S.A.
Matthew R. Jensen
Affiliation:
Department of Chemistry, University of Nebraska at Kearney, Kearney, NE 68849, U.S.A.
Jiří Olejníček
Affiliation:
Department of Chemistry, University of Nebraska at Kearney, Kearney, NE 68849, U.S.A.
Christopher L. Exstrom
Affiliation:
Department of Chemistry, University of Nebraska at Kearney, Kearney, NE 68849, U.S.A.
Scott A. Darveau
Affiliation:
Department of Chemistry, University of Nebraska at Kearney, Kearney, NE 68849, U.S.A.
Rodney J. Soukup
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, U.S.A.
Natale J. Ianno
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, U.S.A.
Amitabha Sarkar
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, U.S.A.
Štěpán Kment
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, U.S.A.
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Abstract

Many reported CuIn1-xGaxSe2 (CIGS) thin films for high-efficiency solar cells have been prepared via a two-stage process that consists of a high-vacuum film deposition step followed by selenization with excess H2Se gas or Se vapor. Removing toxic gas and high-vacuum requirements from this process would greatly simplify it and make it less hazardous. We report the formation of CuIn1-xGaxSe2 (x = 0, 0.25, 0.50, 0.75, 1.0) thin films achieved by rapid thermal annealing of spray-deposited CuIn1-xGaxS2 and Se in the absence of an additional selenium source. To prepare the Se layer, commercial Se powder was dissolved by refluxing in ethylenediamine/2,2-dimethylimidizolidine. After cooling to room temperature, this mixture was combined with 2-propanol and the resulting colloidal Se suspension was sprayed by airbrush onto a heated glass substrate. The resulting film was coated with nanocrystalline CuIn1-xGaxS2 via spray deposition of a toluene-based “nanoink” suspension. The two-layer sample was annealed at 550 oC in an argon atmosphere for 60 minutes to form the final CIGS product. Scanning electron microscopy images reveal that film grains are 200-300 nm in diameter and comparable to sizes of the reactant CuIn1-xGaxS2 nanoparticles. XRD patterns are consistent with the chalcopyrite unit cell and calculated lattice parameters and A1 phonon frequencies change nearly linearly between those for CuInSe2 and CuGaSe2.

Keywords

nanostructureannealingSe
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1324: Symposium D – Compound Semiconductors for Energy Applications and Environmental Sustainability , 2011 , mrss11-1324-d15-05
Copyright
Copyright © Materials Research Society 2011

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References

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