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Nano Research

Article Title

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

Authors

Sai Bai, State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Department of Materials Science and Engineering, and Center for Chemistry of High-Performance and Novel Materials, Zhejiang University, Hangzhou 310027, China
Zhongwei Wu, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren’ai Road, Suzhou 215123, China
Xiaojing Wu, Department of Electronic Engineering, the Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
Yizheng Jin, State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Department of Materials Science and Engineering, and Center for Chemistry of High-Performance and Novel Materials, Zhejiang University, Hangzhou 310027, China
Ni Zhao, Department of Electronic Engineering, the Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China Shenzhen Research Institute, the Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
Zhihui Chen, State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Department of Materials Science and Engineering, and Center for Chemistry of High-Performance and Novel Materials, Zhejiang University, Hangzhou 310027, China
Qingqing Mei, State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Department of Materials Science and Engineering, and Center for Chemistry of High-Performance and Novel Materials, Zhejiang University, Hangzhou 310027, China
Xin Wang, State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Department of Materials Science and Engineering, and Center for Chemistry of High-Performance and Novel Materials, Zhejiang University, Hangzhou 310027, China
Zhizhen Ye, State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Department of Materials Science and Engineering, and Center for Chemistry of High-Performance and Novel Materials, Zhejiang University, Hangzhou 310027, China
Tao Song, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren’ai Road, Suzhou 215123, China
Ruiyuan Liu, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren’ai Road, Suzhou 215123, China
Shuit-tong Lee, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren’ai Road, Suzhou 215123, China
Baoquan Sun, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren’ai Road, Suzhou 215123, China

Keywords

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

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.

Graphical Abstract

Publisher

Tsinghua University Press

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