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Vol. 15 (2023)

Stabilizing Buried Interface via Synergistic Effect of Fluorine and Sulfonyl Functional Groups Toward Efficient and Stable Perovskite Solar Cells

https://doi.org/10.1007/s40820-022-00992-5
Cheng Gong
Key Laboratory of Optoelectronic Technology and Systems (Ministry of Education), Chongqing University, Chongqing 400044, People’s Republic of China
Cong Zhang
Key Laboratory of Optoelectronic Technology and Systems (Ministry of Education), Chongqing University, Chongqing 400044, People’s Republic of China
Qixin Zhuang
Key Laboratory of Optoelectronic Technology and Systems (Ministry of Education), Chongqing University, Chongqing 400044, People’s Republic of China
Haiyun Li
Key Laboratory of Optoelectronic Technology and Systems (Ministry of Education), Chongqing University, Chongqing 400044, People’s Republic of China
Hua Yang
Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, People’s Republic of China
Jiangzhao Chen
Key Laboratory of Optoelectronic Technology and Systems (Ministry of Education), Chongqing University, Chongqing 400044, People’s Republic of China
Zhigang Zang
Key Laboratory of Optoelectronic Technology and Systems (Ministry of Education), Chongqing University, Chongqing 400044, People’s Republic of China

Corresponding Author: Zhigang Zang

zangzg@cqu.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 17

Abstract

The interfacial defects and energy barrier are main reasons for interfacial nonradiative recombination. In addition, poor perovskite crystallization and incomplete conversion of PbI2 to perovskite restrict further enhancement of the photovoltaic performance of the devices using sequential deposition. Herein, a buried interface stabilization strategy that relies on the synergy of fluorine (F) and sulfonyl (S=O) functional groups is proposed. A series of potassium salts containing halide and non-halogen anions are employed to modify SnO2/perovskite buried interface. Multiple chemical bonds including hydrogen bond, coordination bond and ionic bond are realized, which strengthens interfacial contact and defect passivation effect. The chemical interaction between modification molecules and perovskite along with SnO2 heightens incessantly as the number of S=O and F augments. The chemical interaction strength between modifiers and perovskite as well as SnO2 gradually increases with the increase in the number of S=O and F. The defect passivation effect is positively correlated with the chemical interaction strength. The crystallization kinetics is regulated through the compromise between chemical interaction strength and wettability of substrates. Compared with Cl−, all non-halogen anions perform better in crystallization optimization, energy band regulation and defect passivation. The device with potassium bis (fluorosulfonyl) imide achieves a tempting efficiency of 24.17%.


Highlights:


1 An effective buried interface stabilization strategy based on synergistic effect of fluorine and sulfonyl functional groups is proposed.
2 The correlations between molecular structures, defect passivation, interfacial energy band alignment, perovskite crystallization and device performance are established.
3 The device with KFSI achieves an impressive efficiency of 24.17%.

Keywords

Perovskite solar cells Buried interface Multiple chemical bonds Synergistic effect of functional groups Defect passivation
Gong, Cheng, Cong Zhang, Qixin Zhuang, Haiyun Li, Hua Yang, Jiangzhao Chen, and Zhigang Zang. 2022. “Stabilizing Buried Interface via Synergistic Effect of Fluorine and Sulfonyl Functional Groups Toward Efficient and Stable Perovskite Solar Cells”. Nano-Micro Letters 15 (December):17. https://doi.org/10.1007/s40820-022-00992-5.
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