TiO_(2)Electron Transport Layer with p-n Homojunctions for Efficient and Stable Perovskite Solar Cells  

作　　者：Wenhao Zhao Pengfei Guo Jiahao Wu Deyou Lin Ning Jia Zhiyu Fang Chong Liu Qian Ye Jijun Zou Yuanyuan Zhou Hongqiang Wang 

机构地区：[1]State Key Laboratory of Solidification Processing,Center for Nano Energy Materials,School of Materials Science and Engineering,Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU),Xi'an 710072,People's Republic of China [2]Department of Chemical and Biological Engineering,Hong Kong University of Science and Technology,Clear Water Bay,Hong Kong SAR,People's Republic of China [3]Key Laboratory for Green Chemical Technology of the Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,People's Republic of China [4]Chongqing Innovation Center of Northwestern,Polytechnical University,Northwestern Polytechnical University,Chongqing 401135,People's Republic of China

出　　处：《Nano-Micro Letters》2024年第10期1-14,共14页纳微快报（英文版）

基　　金：financially supported by the project of the National Natural Science Foundation of China(52202115 and 52172101);the China Postdoctoral Science Foundation(2022M722586);the Natural Science Foundation of Chongqing,China(CSTB2022NSCQ-MSX1085);the Shaanxi Science and Technology Innovation Team(2023-CX-TD-44);the Fundamental Research Funds for the Central Universities(3102019JC005 and G2022KY0604)。

摘　　要：Low-temperature processed electron transport layer(ETL)of TiO_(2)that is widely used in planar perovskite solar cells(PSCs)has inherent low carrier mobility,resulting in insufficient photogenerated elec-tron transport and thus recombination loss at buried interface.Herein,we demonstrate an effective strategy of laser embedding of p-n homojunctions in the TiO_(2)ETL to accelerate electron transport in PSCs,through localized build-in electric fields that enables boosted electron mobility by two orders of magnitude.Such embedding is found significantly helpful for not only the enhanced crystallization quality of TiO_(2)ETL,but the fabrication of perovskite films with larger-grain and the less-trap-states.The embedded p-n homojunction enables also the modulation of interfacial energy level between perovskite layers and ETLs,favoring for the reduced voltage deficit of PSCs.Benefiting from these merits,the formamidinium lead iodide(FAPbI_(3))PSCs employing such ETLs deliver a champion efficiency of 25.50%,along with much-improved device stability under harsh conditions,i.e.,maintain over 95%of their initial efficiency after operation at maximum power point under continuous heat and illumination for 500 h,as well as mixed-cation PSCs with a champion efficiency of 22.02%and over 3000 h of ambient storage under humidity stability of 40%.Present study offers new possibilities of regulating charge transport layers via p-n homojunction embedding for high performance optoelectronics.

关 键 词：Electron transport layer p-n homojunction Electron mobility Buried interface Perovskite solar cells 

分 类 号：TM914.4[电气工程—电力电子与电力传动]