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Photoluminescence spectra of Zn1−xCdxAl2Se4-4xS4x single crystals

  • Sung-Hyu Choe (a1), Chang-Sun Yoon (a2), Moon-Seog Jin (a3), Seung-Cheol Hyun (a4), Chang Dae Kim (a4), Choong-Il Lee (a5), Jae-Mo Goh (a6), Seok-Kyun Oh (a6), Ho-Jun Song (a6) and Wha-Tek Kim (a6)...

Abstract

We investigated the photoluminescence as well as the crystal structure and optical energy gaps of the Zn1-xCdxAl2Se4-4xS4x solid solution system based on the Al-related compounds of ZnAl2Se4, ZnAl2S4, CdAl2Se4, and CdAl2S4. The single crystals of the system with 0.0 ≤ x ≤ 1.0 were grown by the chemical transport reaction technique. The Zn1-xCdxAl2Se4-4xS4x crystallizes in a defect chalcopyrite structure for a whole composition and has an optical energy gap ranging from 3.525 to 3.577 eV at 13 K. The photoluminescence spectra at 13 K showed a strong emission band in the blue spectral region and a weak broad emission band in the visible region due to donor–acceptor pair recombination. The composition and temperature dependence of these bands were examined in the investigated regions. The simple energy band scheme for the radiative mechanisms of the Zn1-xCdxAl2Se4-4xS4x is proposed on the basis of our experimental results along with photo-induced current transient spectroscopy measurements.

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