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Compositional dependence of optical transition energies in highly mismatched Zn 1− x Cd x Te 1− y O y alloys

Highly mismatched Zn 1− x Cd x Te 1− y O y layers with a wide range of Cd and O compositions of 0–0.7 and 0.005–0.02, respectively, were grown by molecular beam epitaxy for the application of intermediate band solar cells. The electron transition energies from the valence band (VB) to E − and E + ba...

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Published in:Applied physics express 2016-02, Vol.9 (2), p.21202
Main Authors: Tanaka, Tooru, Mizoguchi, Kosuke, Terasawa, Toshiki, Okano, Yuuki, Saito, Katsuhiko, Guo, Qixin, Nishio, Mitsuhiro, Man Yu, Kin, Walukiewicz, Wladek
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creator Tanaka, Tooru
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description Highly mismatched Zn 1− x Cd x Te 1− y O y layers with a wide range of Cd and O compositions of 0–0.7 and 0.005–0.02, respectively, were grown by molecular beam epitaxy for the application of intermediate band solar cells. The electron transition energies from the valence band (VB) to E − and E + bands decreased with increasing Cd content. The variation of the transition energies was consistent with the theoretical calculation based on the band anticrossing model. The magnitude of the optical absorption due to electron transitions from the VB to E − band was strongly dependent on the Cd content because of the changing character of the E − band.
doi_str_mv 10.7567/APEX.9.021202
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title Compositional dependence of optical transition energies in highly mismatched Zn 1− x Cd x Te 1− y O y alloys
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