Bifunctional passivation by lewis-base molecules for efficient printable mesoscopic perovskite solar cells  

作　　者：Hang Yang Jianhong Zhao Xiaodong Ren Tong Zhou Henbing Zhang Weilong Zhang Jin Zhang Guangzhi Hu Yuming Zhang Wen-Hua Zhang Qingju Liu 

机构地区：[1]Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University,Kunming 650091,Yunnan,China [2]Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University,Kunming 650091,Yunnan,China

出　　处：《Journal of Energy Chemistry》2024年第9期177-184,共8页能源化学（英文版）

基　　金：funded by the Yunnan Yunling Scholars Project,the National Natural Science Foundation of China(No.51562038);the Young-Middle-Aged Academic and Technical Leaders Reserve Talent Project in Yunnan Province(No.202005AC160015);the Yunnan Basic Applied Research Project(No.202101AT070013).

摘　　要：Printable mesoscopic perovskite solar cells(PM-PSCs)possess notable merits in terms of cost-effectiveness,easy manufacturing,and large scale applications.Nevertheless,the absence of a hole transport layer contributes to the exacerbation of carrier recombination,and the defects between the perovskite and electron transport layer(ETL)interfaces significantly decrease the efficiency of the devices.In this study,a bifunctional surface passivation approach is proposed by applying a thioacetamide(TAA)surfactant on the mesoporous TiO_(2)interface.The results demonstrate that TAA molecules could interact with TiO_(2),thereby diminishing the oxygen vacancy defects.Additionally,the amino group and sulfur atoms in TAA molecules act as Lewis base to effectively passivate the uncoordinated Pb^(2+)in perovskite and improve the morphology of perovskite,and decrease the trap-state density of perovskite.The TAA passivation mechanism improves the alignment of energy levels between TiO_(2)and perovskite,facilitating electron transport and reducing carrier recombination.Consequently,the TAA-passivated device achieved a champion power conversion efficiency(PCE)of 17.86%with a high fill factor(FF)of 79.16%and an open-circuit voltage(V_(OC))of 0.971 V.This investigation presents a feasible strategy for interfacial passivation of the ETL to further improve the efficiency of PM-PSCs.

关 键 词：Perovskite solarcells Carbon electrode THIOACETAMIDE Interfacial passivation 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]