摘要
Tin(Sn)-based perovskite solar cells(PSCs)have recently made inspiring progress,and certified power conversion efficiency(PCE)has reached impressive value of 14.8%.However,it is still challenging to realize efficient and stable 3D Sn-based PSCs due to the fast crystallization and easy Sn^(2+)oxidation of Sn-based perovskite.Herein,we reported the utilization of a reductive ionic liquid,methylamine formate(MAFa),to drive the controlled crystallization process and suppress Sn^(2+)oxidation of FASnI_(3)perovskite film.The coordination of C=O and Sn^(2+)and the hydrogen bonding of N-H···I between the MAFa and FASnI_(3)precursors are shown to be responsible for retarding the crystallization of FASnI_(3)during film-forming process,which promotes the oriented growth and reduced defect traps of the film.Moreover,the strong reducibility of–CHO groups in Fa−suppresses the oxidation of Sn^(2+)in the film.As a result,MAFa-modified 3D PSCs device could reach champion PCE of up to 8.50%,which is enhanced by 26.11%compared to the control device with PCE of 6.74%.Most importantly,the MAFa-modified device shows much improved stability compared to the control device under same conditions without encapsulation.This work adds key building blocks for further boosting the PCE and stability of Sn-based PSCs.
基金
financially supported by the Natural Science Foundation of China (Grants 51972172,61705102,and 51802253)
the China Postdoctoral Science Foundation (Grants 2021M692630)
Natural Science Basic Research Plan in Shaanxi Province of China (2022JQ-629,2021JLM-43)
the Joint Research Funds of Department of Science&Technology of Shaanxi Province and Northwestern Polytechnical University (2020GXLH-Z-007 and 2020GXLH-Z-014)
Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars,China(Grant BK20200034)
the Innovation Project of Optics Valley Laboratory(OVL2021BG006)
the Open Project Program of Wuhan National Laboratory for Optoelectronics (2021WNLOKF003)
the Young 1000 Talents Global Recruitment Program of China
the Fundamental Research Funds for the Central Universities
作者简介
He Dong,Chenxin Ran,These authors contributed equally to this work;Corresponding authors:Chenxin Ran,(email:iamcxran@nwpu.edu.cn);Corresponding authors:Yingdong Xia,(email:iamydxia@njtech.edu.cn);Corresponding authors:Wei Huang,(email:iamwhuang@nwpu.edu.cn)。
