Volume 6, Issue 7 2200224
Research Article

Improvement in the Performance of Inverted 3D/2D Perovskite Solar Cells by Ambient Exposure

Yantao Wang

Yantao Wang

Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong, China

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Jingyang Lin

Jingyang Lin

Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong, China

Department of Physics, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, Guangdong, 518055 P. R. China

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Yanling He

Yanling He

Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong, China

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Yi Zhang

Yi Zhang

Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong, China

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Qiong Liang

Qiong Liang

Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, 11 Yuk Choi Rd., Hung Hom, Hong Kong, China

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Fangzhou Liu

Fangzhou Liu

Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong, China

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Zhiwei Zhou

Zhiwei Zhou

Department of Mechanical Engineering, University of Hong Kong, Pokfulam Road, Hong Kong, China

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Christopher C. S. Chan

Christopher C. S. Chan

Department of Physics, The Hong Kong University of Science and Technology, Clearwater Bay, Hong Kong, China

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Gang Li

Gang Li

Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, 11 Yuk Choi Rd., Hung Hom, Hong Kong, China

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Shien-Ping Feng

Shien-Ping Feng

Department of Mechanical Engineering, University of Hong Kong, Pokfulam Road, Hong Kong, China

Department of Advanced Design and Systems Engineering, City University of Hong Kong, Kowloon, Hong Kong, China

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Alan Man Ching Ng

Alan Man Ching Ng

Department of Physics, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, Guangdong, 518055 P. R. China

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Kam Sing Wong

Kam Sing Wong

Department of Physics, The Hong Kong University of Science and Technology, Clearwater Bay, Hong Kong, China

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Jasminka Popović

Jasminka Popović

Division of Materials Physics, Ruđer Bošković Institute, Bijenička 54, Zagreb, 10000 Croatia

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Aleksandra B. Djurišić

Corresponding Author

Aleksandra B. Djurišić

Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong, China

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First published: 03 April 2022
Citations: 6

Abstract

Perovskite solar cells (PSCs) are known to be sensitive to the exposure to ambient humidity, which typically results in the degradation and deterioration of performance, although positive effects of exposure to moisture have also been reported, due to recrystallization of the perovskite. Common approach to improve stability is to use 3D/2D perovskite active layer, where 2D capping layer is prepared by spin coating the bulky organic cation halide. Herein, it is shown that optimizing the exposure of the capping layer prepared by spin coating phenylethylammonium iodide (PEAI) to ambient atmosphere results in substantial improvement of the PSC performance. Furthermore, the initial effects of PEAI treatment are dependent on the NiO x /perovskite interface, but in all cases except at very high humidity (80–85% RH) optimized exposure to ambient results in improved performance. The variations in device performance with PEAI treatment and ambient exposure can be attributed to defect passivation and changes in the charge extraction due to energy-level alignment at the interfaces. The best performing devices have passivation of NiO x /perovskite interface and PEAI treatment of top surface followed by exposure to ambient atmosphere at RH of 40–45%, which results in the power conversion efficiency increase from 20.3% to 22.4%.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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