摘要
The electron transport layer(ETL)plays an important role on the performance and stability of perovskite solar cells(PSCs).Developing double ETL is a promising strategy to take the advantages of different ETL materials and avoid their drawbacks.Here,an ultrathin SnO_(2)layer of~5 nm deposited by atomic layer deposit(ALD)was used to construct a TiO_(2)/SnO_(2)double ETL,improving the power conversion efficiency(PCE)from 18.02%to 21.13%.The ultrathin SnO_(2)layer enhances the electrical conductivity of the double layer ETLs and improves band alignment at the ETL/perovskite interface,promoting charge extraction and transfer.The ultrathin SnO_(2)layer also passivates the ETL/perovskite interface,suppressing nonradiative recombination.The double ETL achieves outstanding stability compared with PSCs with TiO_(2)only ETL.The PSCs with double ETL retains 85%of its initial PCE after 900 hours illumination.Our work demonstrates the prospects of using ultrathin metal oxide to construct double ETL for high-performance PSCs.
作者
李灿
徐宏宇
郅冲阳
万志
李祯
Can Li;Hongyu Xu;Chongyang Zhi;Zhi Wan;Zhen Li(State Key Laboratory of Solidification Processing,Center for Nano Energy Materials,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China)
基金
supported by the National Key R&D Program of China(Grant No.2019YFB1503201)
the National Natural Science Foundation of China(Grant Nos.52172238,52102304,51902264,and 51902177)
the Natural Science Foundation of Shanxi Province,China(Grant No.2020JM093)
Joint Research Funds of Department of Science&Technology of Shaanxi Province and Northwestern Polytechnical University(Grant No.2020GXLH-Z-014)
Science Technology and Innovation Commission of Shenzhen Municipality(Grant No.JCYJ20190807111605472)
the Fundamental Research Funds for the Central Universities,China(Grant Nos.3102019JC0005 and G2021KY05103)。