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Nano Research 2014, 7(12): 1749-1758 https://doi.org/10.1007/s12274-014-0534-8
Research Article | Issue | Published: 29 August 2014

High-performance planar heterojunction perovskite solar cells: Preserving long charge carrier diffusion lengths and interfacial engineering

Show Author's Information Sai Bai1,§,  Zhongwei Wu2,§,  Xiaojing Wu3,  Yizheng Jin1( ),  Ni Zhao3,4,  Zhihui Chen1,  Qingqing Mei1,  Xin Wang1,  Zhizhen Ye1,  Tao Song2,  Ruiyuan Liu2,  Shuit-tong Lee2,  Baoquan Sun2( )
State Key Laboratory of Silicon MaterialsCyrus Tang Center for Sensor Materials and ApplicationsDepartment of Materials Science and Engineeringand Center for Chemistry of High-Performance and Novel MaterialsZhejiang UniversityHangzhou310027China
Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesInstitute of Functional Nano & Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow University199 Ren'ai RoadSuzhou215123China
Department of Electronic Engineeringthe Chinese University of Hong KongShatin, New Territories, Hong KongChina
Shenzhen Research Institutethe Chinese University of Hong KongShatin, New Territories, Hong KongChina

§ Both authors contributed equally to this work.

Keywords:
perovskite solar cells, planar heterojunction, charge carrier diffusion, lengths, ZnO nanocrystal films, large area devices
Cite this article:
Bai S, Wu Z, Wu X, et al. High-performance planar heterojunction perovskite solar cells: Preserving long charge carrier diffusion lengths and interfacial engineering. Nano Research, 2014, 7(12): 1749-1758. https://doi.org/10.1007/s12274-014-0534-8
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Abstract Full text Electronic supplementary material About this article

We demonstrate that charge carrier diffusion lengths of two classes of perovskites, CH3NH3PbI3-xClx and CH3NH3PbI3, are both highly sensitive to film processing conditions and optimal processing procedures are critical to preserving the long carrier diffusion lengths of the perovskite films. This understanding, together with the improved cathode interface using bilayer-structured electron transporting interlayers of [6, 6]-phenyl-C61-butyric acid methyl ester (PCBM)/ZnO, leads to the successful fabrication of highly efficient, stable and reproducible planar heterojunction CH3NH3PbI3-xClx solar cells with impressive power-conversion efficiencies (PCEs) up to 15.9%. A 1-square-centimeter device yielding a PCE of 12.3% has been realized, demonstrating that this simple planar structure is promising for large-area devices.


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About this article

High-performance planar heterojunction perovskite solar cells: Preserving long charge carrier diffusion lengths and interfacial engineering

Show Author's information Sai Bai1,§, Zhongwei Wu2,§, Xiaojing Wu3, Yizheng Jin1( ), Ni Zhao3,4, Zhihui Chen1, Qingqing Mei1, Xin Wang1, Zhizhen Ye1, Tao Song2, Ruiyuan Liu2, Shuit-tong Lee2, Baoquan Sun2( )
State Key Laboratory of Silicon MaterialsCyrus Tang Center for Sensor Materials and ApplicationsDepartment of Materials Science and Engineeringand Center for Chemistry of High-Performance and Novel MaterialsZhejiang UniversityHangzhou310027China
Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesInstitute of Functional Nano & Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow University199 Ren'ai RoadSuzhou215123China
Department of Electronic Engineeringthe Chinese University of Hong KongShatin, New Territories, Hong KongChina
Shenzhen Research Institutethe Chinese University of Hong KongShatin, New Territories, Hong KongChina

§ Both authors contributed equally to this work.

Abstract

We demonstrate that charge carrier diffusion lengths of two classes of perovskites, CH3NH3PbI3-xClx and CH3NH3PbI3, are both highly sensitive to film processing conditions and optimal processing procedures are critical to preserving the long carrier diffusion lengths of the perovskite films. This understanding, together with the improved cathode interface using bilayer-structured electron transporting interlayers of [6, 6]-phenyl-C61-butyric acid methyl ester (PCBM)/ZnO, leads to the successful fabrication of highly efficient, stable and reproducible planar heterojunction CH3NH3PbI3-xClx solar cells with impressive power-conversion efficiencies (PCEs) up to 15.9%. A 1-square-centimeter device yielding a PCE of 12.3% has been realized, demonstrating that this simple planar structure is promising for large-area devices.

Keywords: perovskite solar cells, planar heterojunction, charge carrier diffusion, lengths, ZnO nanocrystal films, large area devices

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Publication history
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Acknowledgements

Publication history

Received: 03 June 2014
Revised: 21 June 2014
Accepted: 30 June 2014
Published: 29 August 2014
Issue date: December 2014

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2014

Acknowledgements

Acknowledgements

This work is financially supported by the National Basic Research Program of China (973 Program, No. 2012CB932402), the National High Technology Research and Development Program of China (No. 2011AA050520), the National Natural Science Foundation of China (Nos. 51172203, 61176057, 91123005, 61205036), the Natural Science Funds for Distinguished Young Scholars of Zhejiang Province (No. R4110189), the Public Welfare Project of Zhejiang Province (No. 2013C31057), the Theme-based Research Scheme No. T23-407/13-N from Research Grants Council of Hong Kong, and a Shun Hing Institute of Advanced Engineering Grant (No. 8115041) from the Chinese University of Hong Kong. We thank Prof. Xiaogang Peng's group (Chemistry Department, Zhejiang University, China) for assistance with the TCSPC measurements.

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