溶液微晶提升全无机CsPbIBr_(2)钙钛矿的薄膜质量并减小碳基光伏器件内部载流子复合  

Solution microcrystal enables a high-quality CsPbIBr_(2)film to minimize intragranular charge recombination for air-stable,carbon-based photovoltaics

作　　者：闫福日 段加龙 郭琪瑶 张乔宇 杨希娅 杨培志 唐群委 Furi Yan;Jialong Duan;Qiyao Guo;Qiaoyu Zhang;Xiya Yang;Peizhi Yang;Qunwei Tang(College of Chemical and Biological Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials,Ministry of Education,Yunnan Normal University,Kunming 650500,China;College of Information Science and Technology,Jinan University,Guangzhou 510632,China)

机构地区：[1]College of Chemical and Biological Engineering,Shandong University of Science and Technology,Qingdao 266590,China [2]Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials,Ministry of Education,Yunnan Normal University,Kunming 650500,China [3]College of Information Science and Technology,Jinan University,Guangzhou 510632,China

出　　处：《Science China Materials》2023年第2期485-492,共8页中国科学（材料科学（英文版）

基　　金：supported by the National Key Research and Development Program of China(2021YFE0111000);the National Natural Science Foundation of China(22109053,22179051,U1802257,and 61504118);Guangdong Basic and Applied Basic Research Foundation(2020A1515110548);the Natural Science Foundation of Guangdong Province(2019B151502061);Guangzhou Science and Technology Planning Project(202102020775 and 202102010091);the Scientific Research Fund of Yunnan Provincial Department of Education(2022Y188);the Key Applied Basic Research Program of Yunnan Province(202201AS070023)。

摘　　要：钙钛矿前驱体溶液的胶体特性决定了钙钛矿薄膜的质量以及钙钛矿太阳能电池的光电转换效率.在本文中,我们通过简单地调控钙钛矿溶液的温度,实现了钙钛矿薄膜质量的优化.系统的表征测试表明,与室温下的钙钛矿前驱体溶液不同,在高温条件下,钙钛矿前驱体溶液中会产生尺寸在一微米以上的稳定微晶,能够促进钙钛矿中间相的自发成核并实现薄膜的择优生长.薄膜质量优化后,由于缺陷态减少和晶粒尺寸增加,光生电荷能够快速地在大晶粒内部传输,降低晶粒内部的非辐射复合以及辐射复合,将电池效率提升至11.12%,明显高于未优化器件的8.51%.更重要的是,优化器件表现出非常优异的空气稳定性和高温稳定性.The colloidal nature of perovskite precursor solution highly determines the quality of perovskite film and the photovoltaic performance of a perovskite solar cell(PSC).Herein,we demonstrate a facile method to fabricate a high-quality all-inorganic CsPbIBr_(2)film by regulating the temperature of the precursor solution.After characterization,stable microcrystals with a size up to 1μm have been formed under high temperatures,more suitable for preferable crystallization by spontaneous nucleation than the precursor solution at room temperature.Consequently,rapid charge transfer across enlarged crystal grain rather than intragranular charge recombination is achieved within the perovskite film because of reduced defects,promoting the efficiency as high as 11.12%for carbon-based PSC,which is higher than that of a control device with 8.51%efficiency.Moreover,the optimal device shows improved stability under air atmosphere and high-temperature conditions.

关 键 词：薄膜质量 钙钛矿太阳能电池 钙钛矿薄膜 光电转换效率 空气稳定性 自发成核 电池效率 载流子复合 

分 类 号：TB383.2[一般工业技术—材料科学与工程]