Metal-organic frameworks with mixed-ligands strategy as heterogeneous nucleation center to assist crystallization for efficient and stable perovskite solar cells  

作　　者：Yayu Dong Shuang Gai Jian Zhang Ruiqing Fan Boyuan Hu Wei Wang Wei Cao Jiaqi Wang Ke Zhu Debin Xia Lin Geng Yulin Yang 

机构地区：[1]MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China [2]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China

出　　处：《Journal of Energy Chemistry》2023年第2期1-10,I0001,共11页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(22072034,22001050,and 21873025);the China Postdoctoral Science Foundation(2020T130147,2020M681084,and 2022M710949);the Postdoctoral Foundation of Heilongjiang Province(LBH-Z19059);the Natural Science Foundation of Heilongjiang Youth Fund(YQ2021B002).

摘　　要：Deep-level defects and random oriented configuration in perovskite crystallization process would cause the nonradiative recombination and further affect the performance of perovskite solar cells(PSCs).Herein,two metal-organic frameworks(MOFs)with tunable Lewis-base passivation sites have been constructed(Cd-Httb and Cd-Httb-BDC,Httb=5-(4-(1H-1,2,4-triazole-1-yl)benzyl)-1h-tetrazole,BDC=1,4-dicarboxybenzene)to eliminate deep-level defects and simultaneously as nanostructured heterogeneous nucleation seed to assist the growth of large-grained perovskite films.Compared with the control and Cd-Httb,Cd-Httb-BDC designed with mix-ligands strategy exhibited the enhanced inducted effect on the crystallization and nucleation of high-quality perovskite films during annealing process.Consequently,the resultant Cd-Httb-BDC-modified device achieved higher power conversion efficiency(PCE)(22.18%)than the control(20.89%)and Cd-Httb(21.56%).Meanwhile,the unencapsulated Cd-Httb-BDC-modified device still maintained 90%of initial PCE after 1500 h in ambient conditions and exhibited enhanced thermal stability(85℃ in N_(2) atmosphere).This work presented a successful example of mixligands strategy on construction of high-quality MOF-assisted perovskite films for high-efficient and stable PSCs.

关 键 词：Perovskite solar cells Metal organic frameworks Mixed ligands strategy Passivation Stability 

分 类 号：TB383.2[一般工业技术—材料科学与工程] O641.4[理学—物理化学] TM914.4[理学—化学]