TiO2/SnO2 electron transport double layers with ultrathin SnO2 for efficient planar perovskite solar cells

doi:10.1088/1674-1056/ac8349

中国物理B ›› 2022, Vol. 31 ›› Issue (11): 118802-118802.doi: 10.1088/1674-1056/ac8349

所属专题： SPECIAL TOPIC — Emerging photovoltaic materials and devices

TiO₂/SnO₂ electron transport double layers with ultrathin SnO₂ for efficient planar perovskite solar cells

Can Li(李灿), Hongyu Xu(徐宏宇), Chongyang Zhi(郅冲阳), Zhi Wan(万志), and Zhen Li(李祯)^†

State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China

收稿日期:2022-06-12 修回日期:2022-07-20 接受日期:2022-07-22 出版日期:2022-10-17 发布日期:2022-10-28
通讯作者: Zhen Li E-mail:lizhen@nwpu.edu.cn
基金资助:
This work is 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. 2020JM-093), 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), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 3102019JC0005 and G2021KY05103).

TiO₂/SnO₂ electron transport double layers with ultrathin SnO₂ for efficient planar perovskite solar cells

Can Li(李灿), Hongyu Xu(徐宏宇), Chongyang Zhi(郅冲阳), Zhi Wan(万志), and Zhen Li(李祯)^†

State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China

Received:2022-06-12 Revised:2022-07-20 Accepted:2022-07-22 Online:2022-10-17 Published:2022-10-28
Contact: Zhen Li E-mail:lizhen@nwpu.edu.cn
Supported by:
This work is 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. 2020JM-093), 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), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 3102019JC0005 and G2021KY05103).

1. 附件.pdf(800KB)

摘要/Abstract

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 SnO₂ layer of ～ 5 nm deposited by atomic layer deposit (ALD) was used to construct a TiO₂/SnO₂ double ETL, improving the power conversion efficiency (PCE) from 18.02% to 21.13%. The ultrathin SnO₂ 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 SnO₂ layer also passivates the ETL/perovskite interface, suppressing nonradiative recombination. The double ETL achieves outstanding stability compared with PSCs with TiO₂ 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.

关键词: atomic layer deposit, TiO₂, SnO₂, electron transport layer, stability

Abstract: 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 SnO₂ layer of ～ 5 nm deposited by atomic layer deposit (ALD) was used to construct a TiO₂/SnO₂ double ETL, improving the power conversion efficiency (PCE) from 18.02% to 21.13%. The ultrathin SnO₂ 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 SnO₂ layer also passivates the ETL/perovskite interface, suppressing nonradiative recombination. The double ETL achieves outstanding stability compared with PSCs with TiO₂ 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.

Key words: atomic layer deposit, TiO₂, SnO₂, electron transport layer, stability

中图分类号: (Efficiency and performance of solar cells)

88.40.hj

81.15.Hi (Molecular, atomic, ion, and chemical beam epitaxy) 91.60.Ed (Crystal structure and defects, microstructure) 72.20.Jv (Charge carriers: generation, recombination, lifetime, and trapping)

Can Li(李灿), Hongyu Xu(徐宏宇), Chongyang Zhi(郅冲阳), Zhi Wan(万志), and Zhen Li(李祯). TiO₂/SnO₂ electron transport double layers with ultrathin SnO₂ for efficient planar perovskite solar cells[J]. 中国物理B, 2022, 31(11): 118802-118802.

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TiO₂/SnO₂ electron transport double layers with ultrathin SnO₂ for efficient planar perovskite solar cells

TiO₂/SnO₂ electron transport double layers with ultrathin SnO₂ for efficient planar perovskite solar cells

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