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摘要

全无机CsPbBr ₃钙钛矿太阳能电池因其优良的特性而受到广泛关注, 但是钙钛矿层具有带隙宽、结晶性较差、表面缺陷较多和水分稳定性差等缺点, 严重制约了全无机CsPbBr ₃钙钛矿太阳能电池性能的提高和商业化发展. 本文以无空穴传输层的碳基CsPbBr ₃钙钛矿太阳能电池作为控制组, 在PbBr ₂前躯液中引入具有丰富疏水F离子的聚偏氟乙烯(polyvinylidene fluoride, PVDF)作为添加剂, 调节CsPbBr ₃钙钛矿薄膜的生长过程, 改善晶体结构和薄膜形态, 降低缺陷密度及非辐射复合几率. 结果表明, PVDF处理后钙钛矿器件的光伏性能得到了显著改善, 光电转换效率提高至8.17%. 并且在无封装条件下保存1400 h后, 光电转换效率仍可保持90%以上. 这表明适量添加PVDF可以有效提高CsPbBr ₃薄膜质量及器件性能. 本工作对进一步拓展CsPbBr ₃钙钛矿太阳能电池的优化设计思路具有重要意义.

关键词:

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.

Keywords:

作者及机构信息

通信作者:董敬敬,jjdong@cugb.edu.cn

基金项目:国家自然科学基金(批准号: 11404293)和中央高校基本科研业务费专项资金(批准号: 2652019121)资助的课题.

Authors and contacts

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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参考文献

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施引文献

下载: 全尺寸图片幻灯片

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

下载: 导出CSV

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