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Efficient and stable planar all-inorganic perovskite solar cells based on high-quality CsPbBr3 films with controllable morphology
Journal of Energy Chemistry ( IF 14.0 ) Pub Date : 2019-10-31 , DOI: 10.1016/j.jechem.2019.10.017
Xiaojing Wan , Ze Yu , Wenming Tian , Fuzhi Huang , Shengye Jin , Xichuan Yang , Yi-Bing Cheng , Anders Hagfeldt , Licheng Sun

All-inorganic cesium lead bromide (CsPbBr3) perovskite is attracting growing interest as functional materials in photovoltaics and other optoelectronic devices due to its superb stability. However, the fabrication of high-quality CsPbBr3 films still remains a big challenge by solution-process because of the low solubility of the cesium precursor in common solvents. Herein, we report a facile solution-processed approach to prepare high-quality CsPbBr3 perovskite films via a two-step spin-coating method, in which the CsBr methanol/H2O mixed solvent solution is spin-coated onto the lead bromide films, followed by an isopropanol-assisted post-treatment to regulate the crystallization process and to control the film morphology. In this fashion, dense and uniform CsPbBr3 films are obtained consisting of large crystalline domains with sizes up to microns and low defect density. The effectiveness of the resulting CsPbBr3 films is further examined in perovskite solar cells (PSCs) with a simplified planar architecture of fluorine‒doped tin oxide/compact TiO2/CsPbBr3/carbon, which deliver a maximum power conversion efficiency of 8.11% together with excellent thermal and humidity stability. The present work offers a simple and effective strategy in fabrication of high-quality CsPbBr3 films for efficient and stable PSCs as well as other optoelectronic devices.



中文翻译:

基于高质量可控形貌的CsPbBr 3薄膜的高效稳定平面全无机钙钛矿太阳能电池

由于其优异的稳定性,全无机溴化铯铯(CsPbBr 3)钙钛矿作为光伏和其他光电设备中的功能材料正受到越来越多的关注。然而,由于铯前体在普通溶剂中的溶解度低,因此通过溶液法制备高质量的CsPbBr 3薄膜仍然是一个很大的挑战。本文中,我们报告了一种通过两步旋涂法制备高品质CsPbBr 3钙钛矿薄膜的简便溶液处理方法,其中CsBr甲醇/ H 2将混合溶剂溶液旋涂到溴化铅薄膜上,然后进行异丙醇辅助的后处理,以调节结晶过程并控制薄膜的形态。以这种方式,获得了致密且均匀的CsPbBr 3膜,该膜由尺寸最大为微米且缺陷密度低的大晶畴组成。在钙钛矿型太阳能电池(PSC)中进一步检查了所得CsPbBr 3薄膜的有效性,该钙钛矿型太阳能电池具有简化的氟掺杂氧化锡/紧凑型TiO 2 / CsPbBr 3平面结构。/碳,可提供8.11%的最大功率转换效率以及出色的热和湿度稳定性。本工作为高效,稳定的PSC以及其他光电器件的高质量CsPbBr 3薄膜的制造提供了一种简单有效的策略。

更新日期:2019-10-31
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