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Research Article

Bridging buried interface enable 24.67%-efficiency doctor-bladed perovskite solar cells in ambient condition

Jianhui Chang1,2,§, Erming Feng1,2,§, Xiangxiang Feng1,2, Hengyue Li1,2, Yang Ding1,2, Caoyu Long1,2, Siyuan Lu1,2, Haixia Zhu2, Wen Deng1, Jiayan Shi3, Yingguo Yang4, Si Xiao2, Yongbo Yuan1, Junliang Yang1,2,5( )
Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics, Central South University, Changsha 410083, China
Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha 410083, China
Textile and Fashion Collage, Hunan Institute of Engineering, Xiangtan 411101, China
Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

§ Jianhui Chang and Erming Feng contributed equally to this work.

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Graphical Abstract

A unique buried-interface bridging strategy was developed to enhance the electrical properties of the tin oxide (SnO2) electron transport layer (ETL), passivated the perovskite buried-surface defects, and modulated the perovskite crystallographic orientation by introducing 2-(N-morpholino)ethanesulfonic acid potassium salt (MESK) between the SnO2 ETL and the perovskite film. This helped perovskite solar cells (PSCs) fabricated via scalable doctor blading in ambient conditions achieve a power conversion efficiency (PCE) of 24.67%, and PSC modules with an active area of 11.35 cm2 achieve a PCE of 19.45%.

Abstract

Scalable deposition of high-efficiency perovskite solar cells (PSCs) is critical to accelerating their commercial applications. However, a significant number of defects are distributed at the buried interface of perovskite film fabricated by scalable deposition, exhibiting much negative influence on the efficiency and stability of PSCs. Herein, 2-(N-morpholino)ethanesulfonic acid potassium salt (MESK) is incorporated as the bridging layer between the tin oxide (SnO2) electron transport layer (ETL) and the perovskite film deposited via scalable two-step doctor blading. Both experiment and simulation results demonstrate that MESK can passivate the trap states of Sn suspension bonds, thereby enhancing the charge extraction and transport of the SnO2 ETL. Meanwhile, the strong interaction with uncoordinated Pb ions can modulate the crystal growth and crystallographic orientation of perovskite film and passivate buried defects. With employing MESK interface bridging, PSCs fabricated via scalable doctor blading in ambient condition achieve a power conversion efficiency (PCE) of 24.67%, which is one of the highest PCEs for doctor-bladed PSCs, and PSC modules with an active area of 11.35 cm2 achieve a PCE of 19.45%. Furthermore, PSCs exhibit excellent long-term stability, and the unpackaged target device with a storage of 1680 h in ambient condition (25 °C and humidity of 30% relative humidity (RH)) can maintain more than 90% of the initial PCE. The research provides a strategy for constructing a high-performance interface bridge between SnO2 ETL and perovskite film, and achieving efficient and stable large-area PSCs and modules fabricated via scalable doctor-blading process in ambient condition.

Keywords

perovskite solar cellsdoctor bladingburied interfacedefect passivationorientation regulation

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Nano Research
Volume 17 Issue 9,
September 2024
Pages 8068-8076
DOI: 10.1007/s12274-024-6639-9
Cite this article:
Chang J, Feng E, Feng X, et al. Bridging buried interface enable 24.67%-efficiency doctor-bladed perovskite solar cells in ambient condition. Nano Research, 2024, 17(9): 8068-8076. https://doi.org/10.1007/s12274-024-6639-9
Topics:
Perovskite solar cells

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Received: 08 March 2024
Revised: 17 March 2024
Accepted: 17 March 2024
Published: 15 April 2024
© Tsinghua University Press 2024
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