首页|Multifunctional interfacial molecular bridge enabled by an aggregation-induced emission strategy for enhancing efficiency and UV stability of perovskite solar cells

Multifunctional interfacial molecular bridge enabled by an aggregation-induced emission strategy for enhancing efficiency and UV stability of perovskite solar cells

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The interface defects between the electron transport layer(ETL)and the perovskite layer,as well as the low ultraviolet(UV)light utilization rate of the perovskite absorption layer,pose significant challenges for the commercialization of perovskite solar cells(PSCs).To address this issue,this paper proposes an innovative multifunctional interface modulation strategy by introducing aggregation-induced emission(AIE)molecule 5-[4-[1,2,2-tri[4-(3,5-dicarboxyphenyl)phenyl]ethylene]phenyl]benzene-1,3-dicarboxylic acid(H8ETTB)at the SnO2 ETL/perovskite interface.Firstly,the interaction of H8ETTB with the SnO2 sur-face,facilitated by its carboxyl groups,is effective in passivating surface defects caused by non-coordinated Sn and O vacancies.This interaction enhances the conductivity of the SnO2 film and adjusts energy levels,leading to enhanced charge carrier transport.Simultaneously,H8ETTB can passivate non-coordinated Pb2+ions at the perovskite interface,promoting perovskite crystallization and reducing the interface energy barrier,resulting in a perovskite film with low defects and high crystalline quality.More importantly,the H8ETTB molecule,can convert UV light into light absorbable by the perovskite,thereby reducing damage caused by UV light and improving the device's utilization of UV.Consequently,the champion PSC based on SnO2-H8ETTB achieves an impressing efficiency of 23.32％and significantly improved photostability compared with the control device after continuous exposure to intense UV radiation.In addition,the Cs0.05(FA0.95MA0.05)0.95Pb(I0.95Br0.05)3 based device can achieve maximum efficiency of 24.01％,demonstrating the effectiveness and universality of this strategy.Overall,this innovative interface bridging strategy effectively tackles interface defects and low UV light utilization in PSCs,presenting a promising approach for achieving highly efficient and stable PSCs.

Perovskite solar cellsAggregation-induced emissionDefect passivationEfficiencyUV stability

Shuhang Bian、Yuqi Wang、Fancong Zeng、Zhongqi Liu、Bin Liu、Yanjie Wu、Long Shao、Yongzhi Shao、Huan Zhang、Shuainan Liu、Jin Liang、Xue Bai、Lin Xu、Donglei Zhou、Biao Dong、Hongwei Song

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State Key Laboratory on Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,Jilin,China

College of Science,Shanghai University,Shanghai 200444,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFoundation of National Key Laboratory

62350054123743791217415212304462***202302011

2024

10.1016/j.jechem.2024.03.059

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.95(8)