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        Fluorescence of graded-band-gap CdSxSe1-x crystals produced by diffusion

        Author
        Taylor, H.F.
        Smiley, V.N.
        Martin, William Eugene
        Pawka, S.S.
        Attention
        2299/11103
        Abstract
        The fluorescence of CdSxSe1-x mixed crystals with band-gap gradients as large as 1200 eV/cm has been investigated at 77°K. The graded samples were produced by heating CdSe or CdSxSe1-x platelets in a sulfur-selenium atmosphere. Some of the diffused crystals were post-treated in a cadmium atmosphere. Removal of surface material shifted the fluorescence spectra of the diffused crystals to longer wavelengths. The spectral position of fluorescence peaks was determined as a function of the thickness of the removed surface layer. Composition profiles were deduced from these data by correlating fluorescence wavelength with crystal composition. Error-function curves gave a good fit to experimentally determined profiles. Diffusion constants of 7.0 × 10-13 and 1.6 × 10-12 cm2/sec were determined for diffusion temperatures of 600 and 650°C, respectively.
        Publication date
        1972
        Published in
        Physical Review B
        Published version
        https://doi.org/10.1103/PhysRevB.5.1467
        Other links
        http://hdl.handle.net/2299/11103
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