Photoacoustic spectroscopy of sprayed CuGaxIn1−xSe2 thin films

Kotte Ramakrishna Reddy, R. B. V. Chalapathy, Michael Slifkin, A. W. Weiss, Robert Miles

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    CuGaxIn1−xSe2 thin films have been produced using spray-pyrolysis. The layers were deposited onto Mo-coated soda-lime glass at a substrate temperature of 623 K, and the gallium content of the layers varied. The layers were investigated using photoacoustic spectroscopy. The normalised photoacoustic spectra of CuGaxIn1−xSe2 films with x=0, 0.2, 0.4 and 0.5 showed a sudden fall in the photoacoustic signal at photon energies of 0.99, 1.15, 1.27 and 1.36 eV, respectively, which correspond to the respective direct energy band gaps of these films. The photoacoustic spectra also showed peaks at 0.75, 0.78, 0.82, 0.86 and 0.88 eV, respectively, in the sub-band gap region, which have been attributed to the defect states within these films.
    Original languageEnglish
    Pages (from-to)205-207
    JournalThin Solid Films
    Volume387
    Issue number1-2
    DOIs
    Publication statusPublished - May 2001

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