Tailoring the composition and properties of CuInSe<sub>2</sub> materials for solar cell application

Marit Kauk; Mare Altosaar; Jaan Raudoja; Kristi Timmo; Maarja Grossberg; Tiit Varema; Kaia Ernits

doi:10.1117/12.639056

13 June 2006 Tailoring the composition and properties of CuInSe₂ materials for solar cell application

Marit Kauk, Mare Altosaar, Jaan Raudoja, Kristi Timmo, Maarja Grossberg, Tiit Varema, Kaia Ernits

Proceedings Volume 5946, Optical Materials and Applications; 59460U (2006) https://doi.org/10.1117/12.639056
Event: Optical Materials and Applications, 2005, Tartu, Estonia

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.

Citation Download Citation

Marit Kauk, Mare Altosaar, Jaan Raudoja, Kristi Timmo, Maarja Grossberg, Tiit Varema, and Kaia Ernits "Tailoring the composition and properties of CuInSe₂ materials for solar cell application", Proc. SPIE 5946, Optical Materials and Applications, 59460U (13 June 2006); https://doi.org/10.1117/12.639056

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