Volume 58, Issue 51 pp. 18460-18465
Communication

Enhanced Lifetime and Photostability with Low-Temperature Mesoporous ZnTiO3/Compact SnO2 Electrodes in Perovskite Solar Cells

Fengwan Guo

Fengwan Guo

Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 China

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Xiangyu Sun

Xiangyu Sun

State Key Laboratory of Information Photonics and Optical Communications School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876 P. R. China

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Bing Liu

Bing Liu

Hubei Collaborative Innovation Center for Advanced Organochemical Materials, Ministry-of-Education Key Laboratory for the Synthesis and Applications of Organic Functional Molecules, Hubei University, Wuhan, 430062 P. R. China

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Zijiang Yang

Zijiang Yang

Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 China

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Jing Wei

Corresponding Author

Jing Wei

Experimental Center of Advanced Materials, School of Materials Science & Engineering, Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 10081 China

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Prof. Dongsheng Xu

Corresponding Author

Prof. Dongsheng Xu

Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 China

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First published: 13 October 2019
Citations: 42

Graphical Abstract

Low-temperature-processed, UV-inert ZnTiO3 as a mesoporous layer was introduced in SnO2-based planar perovskite solar cells. The application of ZnTiO3 modified the interface of SnO2/perovskite, and significantly improve the UV stability and lifetime of devices. The low-temperature mesoporous structure expands the choice for transmission layer and electrode materials.

Abstract

Perovskite solar cells (PSCs) with power conversion efficiencies (PCEs) of 25 % mainly have SnO2 or TiO2 as electron-transporting layers (ETLs). Now, zinc titanate (ZnTiO3, ZTO) is proposed as mesoporous ETLs owing to its weak photo-effect, excellent carrier extraction, and transfer properties. Uniform mesoporous films were obtained by spinning coating the ZTO ink and annealed below 150 °C. Photovoltaic devices based on Cs0.05FA0.81MA0.14PbI2.55Br0.45 perovskite sandwiched between SnO2-mesorporous ZTO electrode and Spiro-OMeTAD layer achieved the PCE of 20.5 %. The PSCs retained more than 95 % of their original efficiency after 100 days lifetime test without being encapsulated. Additionally, the PSCs retained over 95 % of the initial performance when subjected at the maximum power point voltage for 120 h under AM 1.5 G illumination (100 mW cm−2), demonstrating superior working stability. The application of ZTO provides a better choice for ETLs of PSCs.

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