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Characterization of thin film CuInSe2 and CuGaSe2: The existence and identification of secondary phases

✍ Scribed by J.R. Tuttle; D.S. Albin; R. Noufi

Publisher
Elsevier Science
Year
1989
Weight
332 KB
Volume
27
Category
Article
ISSN
0379-6787

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✦ Synopsis

The optical properties of thin film CulnSe2 and CuGaSe2 have been studied in the near-IR and visible wavelength regions (2000-500 nm). Significant sub-bandgap absorption is observed in films of near-stoichiometric and copper-rich compositions, the origin of which is suspected to be a Cu2_~Se secondary phase at grain boundaries and free surfaces. Isolated thin films of Cu2-sSe have been evaluated and show semi-metallic electro-0ptical behavior. The predominant Cu2-6Se phase present is probably cubic, with nearly identical lattice parameters to those of CuInSe2, which makes its detection difficult in composite films. Identification of CurSe4 in CuGaSe2 has been discussed. A microstructural model of CuInSe2 is presented and suggests a means by which the volume per cent content of the secondary phase can be estimated.

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