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Research Article

Reducing surficial and interfacial defects by thiocyanate ionic liquid additive and ammonium formate passivator for efficient and stable perovskite solar cells

Mengfei Zhu§, Yuren Xia§, Lina Qin§, Kaiqiang Zhang, Junchuan Liang, Cheng Zhao, Daocheng Hong, Minghang Jiang, Xinmei Song, Jie Wei, Pengbo Zhang, Yuxi Tian, Zhong Jin( )
State Key Laboratory of Coordination Chemistry, MOE Key Laboratory of Mesoscopic Chemistry, MOE Key Laboratory of High Performance Polymer Materials and Technology, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, China

§ Mengfei Zhu, Yuren Xia, and Lina Qin contributed equally to this work.

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Graphical Abstract

We proposed a synergistic strategy of employing a pseudo-halide ion liquid additive for grain enlargement and non-halide ammonium formate for surface passivation to improve the efficiency and stability of ternary-cation perovskite solar cells.

Abstract

Organic–inorganic metal halide perovskites have attained extensive attention owing to their outstanding photovoltaic performances, but the existence of numerous defects in crystalline perovskites is still a serious constraint for the further development of perovskite solar cells (PSCs). In particular, the rapid crystallization guided by anti-solvents leads to plenty of surficial and interfacial defects in perovskite films. Herein, we report the adoption of a pseudo-halide anion based ionic liquid additive, 1-butyl-3-methylimidazolium thiocyanate (BMIMSCN) for growing ternary cation (CsFAMA, where FA = formamidinium and MA = methylammonium) perovskites with large-scale crystal grains and strong preferential orientation via the enhanced Ostwald ripening. Meanwhile, a novel halide-free passivator, benzylammonium formate (BAFa), was employed as a buffering layer on the perovskite films to suppress surface-dominated charge recombination. As a result, the cooperative effects of BMIMSCN additive and BAFa passivator lead to significant enhancements on fluorescence lifetime (from 79.41 to 201.01 ns), open-circuit voltage (from 1.13 to 1.19 V), and photoelectric conversion efficiency (from 18.90% to 22.33%). Moreover, the BMIMSCN/BAFa-CsFAMA PSCs demonstrated greatly improved stability against moisture and heat. This work suggests a promising strategy to improve the quality of perovskite materials via reducing the surficial and interfacial defects by the synergistic effects of lattice doping and interface engineering.

Keywords

organic–inorganic perovskite solar cellspseudo-halide ion liquid additivenon-halide ammonium formate passivatorcrystalline and interface engineeringefficiency and stability improvements

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Nano Research
Volume 16 Issue 5,
May 2023
Pages 6849-6858
DOI: 10.1007/s12274-023-5403-x
Cite this article:
Zhu M, Xia Y, Qin L, et al. Reducing surficial and interfacial defects by thiocyanate ionic liquid additive and ammonium formate passivator for efficient and stable perovskite solar cells. Nano Research, 2023, 16(5): 6849-6858. https://doi.org/10.1007/s12274-023-5403-x
Topics:
Perovskite solar cells

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Received: 21 October 2022
Revised: 01 December 2022
Accepted: 11 December 2022
Published: 21 January 2023
© Tsinghua University Press 2023
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