Large improvement of photovoltaic performance of flexible perovskite solar cells using a multifunctional phospho-ethanolamine-modified SnO_(2)layer  

多功能材料磷酸乙醇胺修饰SnO_(2)层实现柔性钙钛矿太阳能电池的光伏性能大幅提高

作　　者：Zijun Yi Xin Li Bo Xiao Yubo Luo Qinghui Jiang Junyou Yang 易子君;李鑫;肖波;罗裕波;姜庆辉;杨君友(State Key Laboratory of Material Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China;Solar Energy Research Institute of Singapore,National University of Singapore,Singapore 117574,Singapore)

机构地区：[1]State Key Laboratory of Material Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China [2]Solar Energy Research Institute of Singapore,National University of Singapore,Singapore 117574,Singapore

出　　处：《Science China Materials》2022年第12期3392-3401,共10页中国科学（材料科学（英文版）

基　　金：the National Key Research and Development Program of China(2020YFA0715000).

摘　　要：The non-radiative recombination loss caused by diverse defects within SnO_(2)electron transport layer(ETL),perovskite film,and their interface greatly hinders the further improvement of the performance and stability of flexible perovskite solar cells(PSCs).Therefore,it is urgent to develop an effective strategy to address these issues.Herein,a multifunctional material,phospho-ethanolamine(PE),is introduced into SnO_(2)aqueous colloids to suppress defects and prepare high-quality ETL.The results demonstrate that the incorporation of PE can significantly reduce the number of Sn dangling bonds due to the formation of new Sn–O–P bonds,which is beneficial to ameliorating the electrical properties of SnO_(2)and obtaining dense SnO_(2)film.Meanwhile,the amino group(NH_(2))of PE can interact with uncoordinated Pb^(2+)in perovskite,thereby suppressing SnO_(2)/perovskite interface defects and obtaining improved perovskite film quality.Consequently,the optimized flexible and rigid PSCs based on the SnO_(2)-PE composite ETL yield outstanding photoelectric conversion efficiency(PCE)of 18.48%and 21.61%,respectively.Moreover,flexible PSCs based on SnO_(2)-PE present excellent mechanical durability,and 90.6%of the original PCE is retained after 1000 bending cycles.SnO_(2)电子传输层(ETL)、钙钛矿薄膜及它们界面中的各种缺陷导致的非辐射复合损失极大地阻碍了柔性钙钛矿太阳能电池(PSCs)性能和稳定性的进一步提高.因此,迫切需要开发有效的策略来解决这些问题.在此,我们将多功能材料磷酸乙醇胺(PE)添加到SnO_(2)水溶胶中以抑制缺陷并制备高质量的ETL.结果表明,由于新共价键Sn–O–P的形成,PE的引入可以显著减少Sn悬挂键的数量,这有利于改善SnO_(2)的电学特性和获得致密的SnO_(2)薄膜.同时,PE分子的氨基(NH_(2))基团可以与钙钛矿中未配位的Pb^(2+)相互作用,从而抑制SnO_(2)/钙钛矿界面缺陷和改善钙钛矿薄膜质量.相应地,基于SnO_(2)-PE复合ETL的柔性和刚性PSCs实现了优异的光电转换效率,分别为18.48%和21.61%.此外,基于SnO_(2)-PE的柔性PSCs呈现出良好的弯曲耐久性,在1000次弯曲循环后仍保留初始效率的90.6%.

关 键 词：perovskite solar cells tin dioxide FLEXIBLE electronic properties defect passivation 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TQ134.32[化学工程—无机化工]