Chemical composition dependence of photoluminescence from Cu2ZnSnS4 thin films with potential fluctuations

被引：6

作者：

Tanaka, Kunihiko ^{[1
]}

Takamatsu, Yoshiharu ^{[1
]}

Miura, Shinya ^{[1
]}

机构：

[1] Nagaoka Univ Technol, Kamitomioka 1603-1, Nagaoka, Niigata 9402188, Japan

来源：

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 14 NO 6 | 2017年 / 14卷 / 06期

关键词：

Cu2ZnSnS4; photoluminescence; potential fluctuations; GAP;

D O I：

10.1002/pssc.201600138

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The temperature and excitation intensity dependence of photoluminescence (PL) spectra from Cu2ZnSnS4 (CZTS) thin films with various chemical compositions was investigated. Three types of CZTS thin films were examined: Zn-rich (group A), Cu-and Zn-poor (group B), and Cu-rich and Zn-poor (group C). Groups A, B, and C gave PL spectra with peaks at around 1.2, 1.30, and 1.45 eV, respectively. These spectra exhibited large peak energy shifts to higher energies as the excitation intensity increased by more than 10 meV/decade due to potential fluctuations. The PL spectra of groups A and B can be attributed to band-to-impurity luminescence, and the origin of the spectra was found to be CuSn and VZn or [V-Zn + Sn-Zn], respectively. The potential fluctuations were estimated from the lower energy side of the PL spectra, and the Cu-poor samples exhibited smaller potential fluctuations. (C) 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页数：5

共 19 条

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