Improving performance of perovskite solar cells enabled by defects passivation and carrier transport dynamics regulation via organic additive  

作　　者：Rongjun Zhao Tai Wu Yong Hua Yude Wang 

机构地区：[1]Department of Physics,Center for Optoelectronics Engineering Research,Yunnan University,Kunming 650091,China [2]Yunnan Key Laboratory for Micro/Nano Materials&Technology,International Joint Research Center for Optoelectronic and Energy Materials,School of Materials and Energy,Yunnan University,Kunming 650091,China [3]Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies,Yunnan University,Kunming 6500504,China

出　　处：《Chinese Chemical Letters》2025年第2期523-528,共6页中国化学快报(英文版)

基　　金：National Natural Science Foundation of China(No.22065038);High-Level Talents Introduction in Yunnan Province(No.C619300A010);the Fund for Excellent Young Scholars of Yunnan(No.202001AW070008);Spring City Plan:the Highlevel Talent Promotion and Training Project of Kunming(No.2022SCP005)for financial support;the support from the Postdoctoral Research Foundation of Yunnan University(No.W8223004);the Postdoctoral Foundation of Department of Human Resources and Social Security of Yunnan Province(No.C615300504046)。

摘　　要：Defects at the grain boundaries(GBs)of perovskite film highly restrict both the efficiency and stability of perovskite solar cells(PSCs).Herein,organic small molecules of butanedioic acid(BA)and acetylenedicarboxylic acid(AA),containing two carbonyl(C=O)groups and different core-units,were incorporated into perovskite as additives for PSCs application.Thanks to the strong coordination interaction between C=O group and under-coordinated Pb^(2+),the additives can effectively passivate film defects and regulate the perovskite crystallization,yielding high-quality perovskite films with lower defect densities.More importantly,the additives can efficiently regulate the charge transport behaviors in PSCs.Benefiting from the defects passivation and the regulation of charge carrier dynamics,the BA and AA-treaded PSCs show the power conversion efficiencies of 21.52%and 20.50%,which are higher than that of the control device(19.41%).Besides,the optimal devices exhibit a remarkable enhanced long-term stability and moisture tolerance compared to the pristine devices.Furthermore,the transient absorption spectrum reveals the mechanism of enhanced photovoltaic performances,attributing to the improvement of charge transport capability at the perovskite/Spiro-OMeTAD interfaces.This work affords a promising strategy to improve the efficiency and stability of PSCs through regulating the charge-carrier dynamic process in perovskite film.

关 键 词：Perovskite solar cells ADDITIVES Defects passivation Carrier dynamics Stability 

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]