首页|Surface repair of wide-bandgap perovskites for high-performance all-perovskite tandem solar cells

Surface repair of wide-bandgap perovskites for high-performance all-perovskite tandem solar cells

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Wide-bandgap(WBG)perovskite solar cells(PSCs)play a fundamental role in perovskite-based tandem solar cells.However,the efficiency of WBG PSCs is limited by significant open-circuit voltage losses,which are primarily caused by surface defects.In this study,we present a novel method for modifying surfaces using the multifunctional S-ethylisothiourea hydrobromide(SEBr),which can passivate both Pb-I and FA-I terminated surfaces.Moreover,the SEBr upshifted the Fermi level at the perovskite inter-face,thereby promoting carrier collection.This proposed method was effective for both 1.67 and 1.77 eV WBG PSCs,achieving power conversion efficiencies(PCEs)of 22.47％and 19.90％,respectively,with Voc values of 1.28 and 1.33 V,along with improved film and device stability.With this advancement,we were able to fabricate monolithic all-perovskite tandem solar cells with a champion PCE of 27.10％.This research offers valuable insights for passivating the surface trap states of WBG perovskite through rational multifunctional molecular engineering.

Wide-bandgap perovskiteSurface defectMultifunctional moleculeAll-perovskite tandem solar cells

Xiaojing Lv、Weisheng Li、Jin Zhang、Yujie Yang、Xuefei Jia、Yitong Ji、Qianqian Lin、Wenchao Huang、Tongle Bu、Zhiwei Ren、Canglang Yao、Fuzhi Huang、Yi-Bing Cheng、Jinhui Tong

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State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,Hubei,China

Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China,School of Physics and Technology,Wuhan University,Wuhan 430072,Hubei,China

Department of Electrical and Electronic Engineering,Photonics Research Institute(PRI),Research Institute for Intelligent Wearable Systems(iWEAR),The Hong Kong Polytechnic University,999077,Hong Kong,China

Laboratory of Advanced Materials,Fudan University,Shanghai 200438,China

Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Foshan 528200,Guangdong,China

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National Natural Science Foundation of ChinaFundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central UniversitiesRISE project Grant(Q-CDBK),Startup Fund for RAPs under the Strategic Hiring Scheme(PoluU)PRI Strategic GrantRI-iWEAR Strategic Supporting Scheme

52330004WUT:2023IVA0752023IVB0091-BD1H1-CD7X1-CD94

2024

10.1016/j.jechem.2024.01.064

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)：2024.93(6)
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