Improvement of performance of CsPbBr<sub>3</sub> perovskite solar cells by polyvinylidene fluoride additive

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Abstract

Recently, the power conversion efficiency (PCE) of organic-inorganic hybrid perovskite solar cells has been enhanced rapidly from 3.8% to 25.8%, which is a top research topic in the field of photovoltaic power generation. However, the preparation of the hybrid perovskite solar cells has high environmental requirements, and the absorber layer is easily caused by the environmental influence and decomposition, resulting in the degradation of device performance. The all-inorganic CsPbBr ₃perovskite material has good stability, can be prepared directly in air, and is more economical, showing great potential applications. However, the PCE of all-inorganic CsPbBr ₃perovskite solar cells is not high, and at this stage, there is still much room for exploring high-quality controllable preparation of CsPbBr ₃films. In this paper, we aim to prepare efficient and stable CsPbBr ₃perovskite solar cells with additive engineering. Polymer is one of the most effective additives in perovskite solar cells. The use of polymer additive in perovskite layer can improve the shape-form, structure, and band gap of the film, thus improving the quality of perovskite film. Polyvinylidene fluoride (PVDF) is a cheap polymer with hydrophobic F ions and long flexible polymer chains, and can be used to prepare efficient and stable perovskite solar cells. In this paper, CsPbBr ₃perovskite films are prepared by multi-part spin-coating method. PVDF with enriched hydrophobic F is added into the PbBr ₂precursor solution as an additive to adjust the crystalline quality of the perovskite film, and the effects of PVDF on the growth process and device performance of the perovskite film are systematically studied. The results show that the PVDF can be used as a template to promote the growth of perovskite crystals, improve the crystal structure and film shape, thus reducing the defect density and charge recombination, and increasing the PCE of the device to 8.17%. The original efficiency of more than 90% can be maintained after 1400 h of storage under unencapsulated condition. Finally, high-efficiency, stable and low-cost CsPbBr ₃perovskite solar cells are obtained, which is important in further expanding the optimized design ideas of CsPbBr ₃perovskite solar cells. The PVDF can form hydrogen bonds with perovskite or interact with lead ions to improve the structural stability of perovskite, and the F ions in PVDF can improve the moisture stability of perovskite layers.

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Corresponding author:Dong Jing-Jing,jjdong@cugb.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 11404293) and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. 2652019121).

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器件薄膜类型	开路电压 V_OC/V	短路电流 J_sc/(mA·cm^–2)	光电转换效率PCE/%	填充因子 FF/%
Control	1.34	6.77	6.81	75
0.3 mg PVDF	1.36	7.03	7.12	74
0.5 mg PVDF	1.31	8.26	8.17	76
1.0 mg PVDF	1.33	7.39	7.40	75

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Vol. 72, Issue 16 - 2023-08-20

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