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Chin. Phys. B, 2022, Vol. 31(11): 118802    DOI: 10.1088/1674-1056/ac8349
Special Issue: SPECIAL TOPIC — Emerging photovoltaic materials and devices
SPECIAL TOPIC—Emerging photovoltaic materials and devices Prev   Next  

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
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.
Keywords:  atomic layer deposit      TiO2      SnO2      electron transport layer      stability  
Received:  12 June 2022      Revised:  20 July 2022      Accepted manuscript online:  22 July 2022
PACS:  88.40.hj (Efficiency and performance of solar cells)  
  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)  
Fund: 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).
Corresponding Authors:  Zhen Li     E-mail:

Cite this article: 

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 2022 Chin. Phys. B 31 118802

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