摘要
2,2',7,7'-Tetrakis(N,N-di(4-methoxyphenyl)amino)-9,9'-spirobifluorene(Spiro)is an essential hole-transport material used in perovskite solar cells(PSCs).However,the redox reaction of Spiro and its impact at the interface with the metal electrode are not yet fully understood.In this study,we introduced a crystalline additive(CA)to regulate the redox process of Spiro and its interface with an Ag electrode.Our findings indicate that CA functions as a molecular scaffold,improving the crystallinity and stability of radicals in Spiro throughout the entire redox reaction.This enhancement increases the hole mobility of Spiro and strengthens the internal electric field,thereby improving hole extraction and transport efficiency at both interfaces.Moreover,the optimized redox reaction of Spiro reduces energy loss at the Ag electrode,significantly boosting the power conversion efficiency to 25.21%.Furthermore,CA mitigates the aggregation of lithium salt and enhances the stability of the device.Our findings contribute to a deeper understanding of hole-transport mechanisms of Spiro and emphasize the importance of reducing energy loss at the Spiro/Ag electrode interface in PSCs.
基金
the National Natural Science Foundation of China(22209144)
the Project of the Natural Science Foundation of Yunnan
the Yunnan Revitalization Talent Support Program(202201AU070030 and 202201AT070114)
the support from the National Natural Science Foundation of China(22065038)
the High-Level Talents Introduction in Yunnan Province(C619300A010)
the Fund for Excellent Young Scholars of Yunnan(202001AW070008)
financial support from the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)under grant number RS-2024-00444389。
作者简介
Corresponding author:Kyungkon Kim,E-mail addresses:kimkk@ewha.ac.kr;Corresponding author:Yong Hua,E-mail addresses:huayong@ynu.edu.cn;Corresponding author:Lin Xie,E-mail addresses:l.xie@ynu.edu.cn。
