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Proceedings Paper

Tailoring the composition and properties of CuInSe2 materials for solar cell application
Author(s): Marit Kauk; Mare Altosaar; Jaan Raudoja; Kristi Timmo; Maarja Grossberg; Tiit Varema; Kaia Ernits
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Paper Abstract

Ternary semiconductor compound CuInSe2 is one of the most promising absorber material used in solar cells. In this study, we used CuInSe2 powder materials synthesized in molten salts. Modifying the preparation conditions, we studied the relationships between the initial and final composition, and determined the preparation conditions for the single- phase growth of CuInSe2. The as-grown samples were annealed in selenium or sulfur vapor at various temperatures for a different time period to change the CuInSe2 material properties. Se vapor treatment has been found to influence the bulk composition. Sulfur vapor treatment has been found to improve the open-circuit voltage of the completed cells by about 100 mV. It could be attributed to an increase of the band gap at the surface of the absorber due to the formation of a wider band gap CuIn(S,Se)2 material. The incorporation of sulfur into CuInSe2 reduces the carrier recombination in the interface region, which was indicated as an improvement of the fill factor of the cells.

Paper Details

Date Published: 13 June 2006
PDF: 6 pages
Proc. SPIE 5946, Optical Materials and Applications, 59460U (13 June 2006); doi: 10.1117/12.639056
Show Author Affiliations
Marit Kauk, Tallinn Univ. of Technology (Estonia)
Mare Altosaar, Tallinn Univ. of Technology (Estonia)
Jaan Raudoja, Tallinn Univ. of Technology (Estonia)
Kristi Timmo, Tallinn Univ. of Technology (Estonia)
Maarja Grossberg, Tallinn Univ. of Technology (Estonia)
Tiit Varema, Tallinn Univ. of Technology (Estonia)
Kaia Ernits, Tallinn Univ. of Technology (Estonia)

Published in SPIE Proceedings Vol. 5946:
Optical Materials and Applications
Arnold Rosental, Editor(s)

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