The effects of SnS2 secondary phases on Cu2ZnSnS4 solar cells: a promising mechanical exfoliation method for its removal
The effects of SnS2 secondary phases on Cu2ZnSnS4 solar cells: a promising mechanical exfoliation method for its removal
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SnS2 第二相对 Cu2ZnSnS4 太阳能电池的影响：一种有前景的机械剥离方法
DOI：
10.1039/c7ta08242h
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发表时间：
2018-02-21
影响因子：
11.9
通讯作者：
Huang, Zhigao
中科院分区：
文献类型：
--
作者：
Wang, Weihuang;Chen, Guilin;Huang, Zhigao
抑制和去除锡黄锡矿Cu 2 ZnSnS 4（CZTS）层中的SnS 2杂质相是改进CZTS太阳能电池的主要挑战;该杂质相可以通过形成二极管和用于载流子收集的势垒而严重损害器件性能。然而，SnS 2的形成和生长机制是不完整的，并且由于其毒性特性，使用（NH 4）2S的普通蚀刻处理是有问题的。在这项研究中，大尺寸的SnS 2片的形成和生长被观察到发生在CZTS薄膜的表面上通过冷凝在冷却过程中。随后，一种新的和良性的剥离过程进行使用胶带，以有效地去除表面上形成的SnS 2，从而在一个均匀的CZTS薄膜。在这种机械剥离之后获得了4.3%的氧化物衍生的CZTS器件的最大效率，这是没有剥离的器件的近11倍。结果表明，该表面处理方法是一种有效的去除SnS 2杂质的绿色方法，大大提高了CZTS器件的性能，对纯相CZTS薄膜的制备具有指导意义。
The inhibition and removal of the SnS2 impurity phase in the kesterite Cu2ZnSnS4 (CZTS) layer is a major challenge for the improvement of CZTS solar cells; this impurity phase can critically damage device performance by forming a diode and a barrier for carrier collection. However, the formation and growth mechanism of SnS2 is incomplete and the common etching treatment with (NH4)2S is problematic because of its toxic characteristics. In this study, the formation and growth of large-size SnS2 sheets were observed to occur on the surface of the CZTS thin film via condensation during the cooling process. Sequently, a novel and benign peeling process was carried out using a sticky tape to effectively remove the SnS2 formed on the surface, resulting in a uniform CZTS thin film. A maximum efficiency of 4.3% of the oxides-derived CZTS device was obtained after this mechanical exfoliation, which is nearly eleven times that of the device without stripping. It was confirmed that this surface treatment is an effective and green way to remove the SnS2 impurity, which largely improved the performance of the CZTS device and may guide the preparation of pure phase CZTS thin films.