Photoluminescence and Raman study of Cu2ZnSn(SexS1-x)4 monograins for photovoltaic applications

被引:263
作者
Grossberg, M. [1 ]
Krustok, J. [1 ]
Raudoja, J. [1 ]
Timmo, K. [1 ]
Altosaar, M. [1 ]
Raadik, T. [1 ]
机构
[1] Tallinn Univ Technol, EE-19086 Tallinn, Estonia
关键词
Cu2ZnSnSe4; Cu2ZnSnS4; Photoluminescence; Raman spectroscopy; THIN-FILMS; CHALCOPYRITE COMPOUNDS; OPTICAL-PROPERTIES; PHASE-EQUILIBRIA; SOLAR-CELLS; CRYSTALS; CU2ZNSNS4; RECOMBINATION; SEMICONDUCTOR; SPECTROSCOPY;
D O I
10.1016/j.tsf.2010.12.099
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The quaternary semiconductors Cu2ZnSnSe4 and Cu2ZnSnS4 have attracted a lot of attention as possible absorber materials for solar cells due to their direct bandgap and high absorption coefficient (> 10(4) cm(-1)). In this study we investigate the optical properties of Cu2ZnSn(SexS1-x)(4) monograin powders that were synthesized from binary compounds in the liquid phase of potassium iodide (KI) flux materials in evacuated quartz ampoules. Radiative recombination processes in Cu2ZnSn(SexS1-x)(4) monograins were studied by using low-temperature photoluminescence (PL) spectroscopy. A continuous shift from 1.3 eV to 0.95 eV of the PL emission peak position with increasing Se concentration was observed indicating the narrowing of the bandgap of the solid solutions. Recombination mechanisms responsible for the PL emission are discussed. Vibrational properties of Cu2ZnSn(SexS1-x)(4) monograins were studied by using micro-Raman spectroscopy. The frequencies of the optical modes in the given materials were detected and the bimodal behaviour of the AI Raman modes of Cu2ZnSnSe4 and Cu2ZnSnS4 is established. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:7403 / 7406
页数:4
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