Chelation of lithium ion with crown ether for eliminating adverse effects caused by Li-TFSI/tBP doping system in Spiro-OMeTAD  

作　　者：Zhongquan Wan Hui Lu Jinyu Yang Yunpeng Zhang Fangyan Lin Jianxing Xia Xiaojun Yao Junsheng Luo Chunyang Jia 

机构地区：[1]State Key Laboratory of Electronic Thin Films and Integrated Devices,School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,Sichuan,China [2]Shenzhen Institute for Advanced Study,University of Electronic Science and Technology of China,Shenzhen 518110,Guangdong,China [3]State Key Laboratory of Applied Organic Chemistry,Lanzhou University,Lanzhou 730000,Gansu,China

出　　处：《Journal of Energy Chemistry》2022年第11期489-496,I0013,共9页能源化学（英文版）

基　　金：the National Natural Science Foundation of China(22175029 and 62104031);the Sichuan Science and Technology Program(2019YJ0162);the Open Foundation of State Key Laboratory of Electronic Thin Films and Integrated Devices(KFJJ202109);the Natural Science Foundation of Shenzhen Innovation Committee(JCYJ20210324135614040);the Technical Field Funds of 173 Project(2021-JCJQ-JJ-0663);the Fundamental Research Funds for the Central Universities of China(ZYGX2021J010 and Y030202059018023)for financial support。

摘　　要：Lithium bis(trifluoromethanesulfonyl)imide(Li-TFSI)/4-tert-butylpyridine(tBP)is a classic doping system for the hole transport material Spiro-OMeTAD in typical n-i-p structure perovskite solar cells(PSCs),but this system will cause many problems such as high hygroscopicity,Li+migration,pinholes and so on,which hinder PSC from maintaining high efficiency and stability for long-term.In this work,an effective strategy is demonstrated to improve the performance and stability of PSC by replacing t BP with 12-crown-4.The chelation of 12-crown-4 with Li+not only improves the doping effect of Li-TFSI,but also perfectly solves the problems caused by the Li-TFSI/tBP system.The PSC based on this strategy achieved a champion power conversion efficiency(PCE)over 21%,which is significantly better than the pristine device(19.37%).More importantly,the without encapsulated device based on Li-TFSI/12-crown-4 still maintains 87%of the initial PCE even after 60 days exposure in air,while the pristine device only maintains 22%of the initial PCE under the same aging conditions.This strategy paves a novel way for constructing efficient and stable PSCs.

关 键 词：Perovskite solar cells Spiro-OMeTAD Li-TFSI dopant 12-Crown-4 CHELATION 

分 类 号：O646[理学—物理化学] TM914.4[理学—化学]