Ligand exchange engineering of FAPbI_(3) perovskite quantum dots for solar cells  

作　　者：Wentao Fan Qiyuan Gao Xinyi Mei Donglin Jia Jingxuan Chen Junming Qiu Qisen Zhou Xiaoliang Zhang 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100191,China

出　　处：《Frontiers of Optoelectronics》2022年第3期139-150,共12页光电子前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51872014);the Recruitment Program of Global Experts,Fundamental Research Funds for the Central Universities and the“111”project(B17002).

摘　　要：Formamidinium lead triiodide(FAPbI_(3))perovskite quantum dots(PQDs)show great advantages in photovoltaic applications due to their ideal bandgap energy,high stability and solution processability.The anti-solvent used for the post-treatment of FAPbI_(3) PQD solid flms signifcantly afects the surface chemistry of the PQDs,and thus the vacancies caused by surface ligand removal inhibit the optoelectronic properties and stability of PQDs.Here,we study the efects of diferent anti-solvents with diferent polarities on FAPbI_(3) PQDs and select a series of organic molecules for surface passivation of PQDs.The results show that methyl acetate could efectively remove surface ligands from the PQD surface without destroying its crystal structure during the post-treatment.The benzamidine hydrochloride(PhFACl)applied as short ligands of PQDs during the post-treatment could fll the A-site and X-site vacancies of PQDs and thus improve the electronic coupling of PQDs.Finally,the PhFACl-based PQD solar cell(PQDSC)achieves a power conversion efciency of 6.4%,compared to that of 4.63%for the conventional PQDSC.This work provides a reference for insights into the surface passivation of PQDs and the improvement in device performance of PQDSCs.

关 键 词：FAPbI_(3) Perovskite quantum dot ANTISOLVENT Surface passivation Solar cell 

分 类 号：O64[理学—物理化学]