Perfection of Perovskite Grain Boundary Passivation by Rhodium Incorporation for Efficient and Stable Solar Cells  

作　　者：Wei Liu Nanjing Liu Shilei Ji Hongfeng Hua Yuhui Ma Ruiyuan Hu Jian Zhang Liang Chu Xing’ao Li Wei Huang 

机构地区：[1]Institute of Advanced Materials and New Energy Technology Engineering Laboratory of Jiangsu Province,Nanjing University of Posts and Telecommunications(NUPT),Nanjing 210023,People’s Republic of China [2]Shaanxi Institute of Flexible Electronics,Northwestern Polytechnical University,Xi’an 710072,People’s Republic of China [3]Guangdong Provincial Key Lab of Nano‑Micro Materials Research,School of Chemical Biology and Biotechnology,Peking University Shenzhen Graduate School,Shenzhen 518055,People’s Republic of China

出　　处：《Nano-Micro Letters》2020年第9期203-213,共11页纳微快报（英文版）

基　　金：supported by the Ministry of Education of China(IRT1148);the National Natural Science Foundation of China(U1732126,11804166,51602161,51372119);China Postdoctoral Science Foundation(2018M630587);the Priority Academic Program Development of Jiangsu Higher Education Institutions(YX03001);Guangdong Science and Technology Program(2017B030314002);Graduate Research Innovation Fund of Jiangsu Province(KYCX18_0863,KYCX18_0847,KYCX18_0869)。

摘　　要：Organic cation and halide anion defects are omnipresent in the perovskite films,which will destroy perovskite electronic structure and downgrade the properties of devices.Defect passivation in halide perovskites is crucial to the application of solar cells.Herein,tiny amounts of trivalent rhodium ion incorporation can help the nucleation of perovskite grain and passivate the defects in the grain boundaries,which can improve efficiency and stability of perovskite solar cells.Through first-principle calculations,rhodium ion incorporation into the perovskite structure can induce ordered arrangement and tune bandgap.In experiment,rhodium ion incorporation with perovskite can contribute to preparing larger crystalline and uniform film,reducing trap-state density and enlarging charge carrier lifetime.After optimizing the content of 1% rhodium,the devices achieved an efficiency up to 20.71% without obvious hysteresis,from 19.09% of that pristine perovskite.In addition,the unencapsulated solar cells maintain 92% of its initial efficiency after 500 h in dry air.This work highlights the advantages of trivalent rhodium ion incorporation in the characteristics of perovskite solar cells,which will promote the future industrial application.

关 键 词：Perovskite solar cells Grain boundary passivation Rhodium incorporation 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383.2[一般工业技术—材料科学与工程]