Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 648, Issue -, Pages 104-110Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.05.196
Keywords
Semiconductors; Oxide materials; Thin film; Crystal structure
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Funding
- Spanish Ministry of Economy and Competitiveness through the CIEMAT Photovoltaic Program
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Formation and crystallization of homogeneous CuAlSe2 (CAS) thin films prepared by a two stage process consisting on the selenization of evaporated metallic precursor layers has been achieved onto transparent and conductive Sb: SnO2 (ATO)-coated glass substrates. Influence on the structural, optical, morphological and compositional properties of the sample thickness and selenization conditions have been analysed. Polycrystalline CuAlSe2 samples with chalcopyrite structure and a preferential orientation along the (112) plane have been obtained on ATO-coated substrates, in a wide range of thicknesses from 0.6 to 2.0 mm, with high degree of reproducibility. Average crystallite size tends to increase and the preferential orientation remains constant with the increase of the CAS thickness and the Se amount in the selenization process. The band gap energy has ranged between 2.3 and 2.5 eV. XPS measurements have shown a slightly Cu-poor surface and homogeneous distribution of Cu and Al in depth. The CAS/ATO contacts have exhibited ohmic characteristics in all cases. (C) 2015 Elsevier B.V. All rights reserved.
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