Improvement of the optical properties of electrodeposited CuInSe2 thin films by thermal and chemical treatments |
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Authors: | C Guillen J Herrero |
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Affiliation: | Instituto de Energias Renouables (CIEMAT), Avda. Complutense 22, E-28040 Madrid, Spain |
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Abstract: | Cu, In and Se have been codeposited in thin films by potentiostatic one-step electrodeposition. The as-deposited material has shown direct optical transitions attributable to the CuInSe2 semiconductor, but also additional absorption corresponding to another semimetallic phase. The secondary phases are selenium and copper selenide compounds which have been determined by composition measurements. In order to eliminate the semimetallic phases and to improve the semiconductor behaviour of the electrodeposited material, thermal and chemical treatments have been performed. After heat-treatment of the samples at 400°C in flowing argon, elemental selenium loss has been detected together with an enhancement of the allowed direct optical transition. The subsequent chemical etching of the layers in a KCN solution has showed to be successful in eliminating the copper selenide phases which were responsible of the remaining sub-bandgap absorption. |
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Keywords: | Copper indium selenide Optical properties Thin film Thermal and chemical treatments |
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