Significantly Improving the Crystal Growth of a CuZnSn(S,Se) Absorber Layer by Air-Annealing a CuZnSnS Precursor Thin Film.

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ID: 263624
2020
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Abstract
The crystal quality of a CuZnSn(S,Se) (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 CuZnSnS 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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shi2020significantlyacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Shi, Xinan;Wang, Yuxiang;Yu, Hui;Wang, Gang;Huang, Lijian;Pan, Daocheng;
Journal ACS applied materials & interfaces
Year 2020
DOI
10.1021/acsami.0c12630
URL
Keywords
surface oxidation air-annealing kesterite sodium diffusion thin-film solar cells

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