Production of single phase chalcopyrite CuInSe2 by spray pyrolysis
- 15 October 1984
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 45 (8) , 890-892
- https://doi.org/10.1063/1.95403
Abstract
Thin films (0.5–2 μ) of CuInSe2 were prepared by spray pyrolysis from solutions with various pH levels and initial Cu:In ratios, and in which the Cu source was either CuCl or CuCl2. The substrate temperature was varied between 225 and 300 °C. All films prepared with CuCl2 were chalcopyrite, while only Cu‐rich CuCl based films exhibited this phase. The appearance of Cu2−xSe and/or Cu2/Se as a second phase was found to depend strongly on solution stoichiometry, pH, temperature, and substrate. Two layer structures consisting of a Cu‐deficient layer on top of a Cu‐rich layer were produced without the presence of any second phases on both glass and Mo‐coated glass. This is the first time single phase chalcopyrite Cu‐deficient layers have been fabricated by spray pyrolysis. A CuInSe2/CdS photovoltaic cell made from a single phase double layer filme on glass gave a Voc of 0.558 V after heat treatment. This Voc is higher than any reported to date. Absorption spectra have also been measured, and are found to improve when CuCl2 is used instead of CuCl.Keywords
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