Influence of anionic substitution on the electrolyte electroreflectance study of band edge transitions in single crystal Cu₂ZnSn(S_xSe_{1鈭?/sub>x)4 solid solutions}

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• 作者：S. Levcenco^a ; ¹ ; D. Dumcenco^a ; ¹ ; Y.P. Wang^a ; Y.S. Huang^a ; ^{ysh@mail.ntust.edu.tw} ; C.H. Ho^b ; E. Arushanov^c ; V. Tezlevan^c ; K.K. Tiong^d
• 关键词：Semiconductors ; Optical properties ; Optical spectroscopy
• 刊名：Optical Materials
• 出版年：2012
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：June, 2012
• 卷：34
• 期：8
• 页码：1362-1365
• 文件大小：3497 K

摘要

Single crystals of Cu₂ZnSn(S_xSe_{1鈭?/sub>x)4 (CZTSSe) solid solutions were grown by chemical vapor transport technique using iodine trichloride as a transport agent. As confirmed by X-ray investigations, the as-grown CZTSSe solid solutions are single phase and crystallized in kesterite structure. The lattice parameters of CZTSSe were determined and the S contents of the obtained crystals were estimated by Vegard鈥檚 law. The composition dependent band gaps of CZTSSe solid solutions were studied by electrolyte electroreflectance (EER) measurements at room temperature. From a detailed lineshape fit of the EER spectra, the band gaps of CZTSSe were determined accurately and were found to decrease almost linearly with the increase of Se content, which agreed well with the recent theoretical first-principle calculations by S. Chen, A. Walsh, J.H. Yang, X.G. Gong, L. Sun, P. X. Yang, J.H. Chu, S.H. Wei, Phys. Rev. B 83 (2011) 125201 (5pp).}