J. Phys. Soc. Jpn. 48 (1980) pp. 490-495  |Next Article|  |Table of Contents|
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Polytypes and Excitons in GaSe_1-xS_x Mixed Crystals

Hiroshi Serizawa, Yoshiro Sasaki and Yuichiro Nishina

(Received May 21, 1979)

We have investigated the quantitative relationship between the polytypes and the direct and indirect exciton gap energies in GaSe_1-xS_x mixed crystals. The X-ray diffraction analysis shows that GaSe_1-xS_x is the ε-type for 0(GaSe)≤x\lesssim0.01, the γ-type for 0.05\lesssimx\lesssim0.4, the β-type for 0.5\lesssimx≤1(GaS), and a mixture of the ε- and γ-types for 0.01\lesssimx\lesssim0.03. The direct and indirect exciton gap energies are determined from optical absorption and luminescence excitation spectra. The plots of the direct and indirect exciton gap energies νs the compositional parameter x show kinks in the neighborhood of x=0.4. Furthermore, a jump in the indirect exciton gap energy is found at around x=0.02. These anomalies at x=0.02 and 0.4 are attributed to the ε-γ and γ-β polytype transformations, respectively. ©1980 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/48/490/
DOI: 10.1143/JPSJ.48.490

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