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Vol. 15 (2023)

Synergistic Optimization of Buried Interface by Multifunctional Organic–Inorganic Complexes for Highly Efficient Planar Perovskite Solar Cells

https://doi.org/10.1007/s40820-023-01130-5
Heng Liu
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Zhengyu Lu
Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, Guangdong, People’s Republic of China
Weihai Zhang
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, People’s Republic of China
Hongkang Zhou
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, People’s Republic of China
Yu Xia
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, People’s Republic of China
Yueqing Shi
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, People’s Republic of China
Junwei Wang
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, People’s Republic of China
Rui Chen
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, People’s Republic of China
Haiping Xia
Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, Guangdong, People’s Republic of China
Hsing‑Lin Wang
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, People’s Republic of China

Corresponding Author: Hsing‑Lin Wang

wangxl3@sustech.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 156

Abstract

For the further improvement of the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs), the buried interface between the perovskite and the electron transport layer is crucial. However, it is challenging to effectively optimize this interface as it is buried beneath the perovskite film. Herein, we have designed and synthesized a series of multifunctional organic–inorganic (OI) complexes as buried interfacial material to promote electron extraction, as well as the crystal growth of the perovskite. The OI complex with BF4− group not only eliminates oxygen vacancies on the SnO2 surface but also balances energy level alignment between SnO2 and perovskite, providing a favorable environment for charge carrier extraction. Moreover, OI complex with amine (− NH2) functional group can regulate the crystallization of the perovskite film via interaction with PbI2, resulting in highly crystallized perovskite film with large grains and low defect density. Consequently, with rational molecular design, the PSCs with optimal OI complex buried interface layer which contains both BF4− and −NH2 functional groups yield a champion device efficiency of 23.69%. More importantly, the resulting unencapsulated device performs excellent ambient stability, maintaining over 90% of its initial efficiency after 2000 h storage, and excellent light stability of 91.5% remaining PCE in the maximum power point tracking measurement (under continuous 100 mW cm−2 light illumination in N2 atmosphere) after 500 h.


Highlights:


1 Highly performed perovskite solar cells are achieved via introducing organic–inorganic CL–NH complex as multifunctional interfacial layer.
2 CL–NH complex not only reduces oxygen vacancies on the surface of SnO2 but also regulates film crystallization, resulting in a superior device efficiency of 23.69%.
3 The resulting device performs excellent stability with 91.5% initial power conversion efficiency retained after 500 h light illumination.

Keywords

Perovskite solar cells Organic Inorganic complexes Multifunctional interfacial material Buried interface layer
Liu, Heng, Zhengyu Lu, Weihai Zhang, Hongkang Zhou, Yu Xia, Yueqing Shi, Junwei Wang, Rui Chen, Haiping Xia, and Hsing‑Lin Wang. 2023. “Synergistic Optimization of Buried Interface by Multifunctional Organic–Inorganic Complexes for Highly Efficient Planar Perovskite Solar Cells”. Nano-Micro Letters 15 (June):156. https://doi.org/10.1007/s40820-023-01130-5.
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