期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 37, 页码 41590-41595出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c12630
关键词
kesterite; thin-film solar cells; air-annealing; surface oxidation; sodium diffusion
资金
- National Natural Science Foundation of China [61974145, 51672267]
- Jilin Provincial Science and Technology Development Program [20180101186JC]
- Open Foundation of Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University
The crystal quality of a Cu2ZnSn(S,Se)(4) (CZTSSe) thin film is crucially important to a high-performance CZTSSe solar cell. After selenization, a bilayer CZTSSe thin film consisting of a large-grain top layer and a small-particle bottom layer is usually observed according to the literature. In this work, a facile air-annealing pretreatment is conducted for a Cu2ZnSnS4 precursor thin film prior to selenization, which can lead to sodium diffusion into the CZTS precursor thin film and surface oxidization of the CZTS thin film. Our experimental results revealed that the Na prediffusion and the surface oxidation of the CZTS precursor thin film can significantly promote the crystal growth of the CZTSSe thin film, which can completely remove the small-particle bottom layer and form a large-grain-spanned CZTSSe thin film. As a result, a photoelectric conversion efficiency of 9.80% was achieved by this method.
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