Multifunctional organic ammonium salt-modified SnO2 nanoparticles toward efficient and stable planar perovskite solar cells

Huan Bi; Xin Zuo; Baibai Liu; Dongmei He; Le Bai; Wenqi Wang; Xiong Li; Zeyun Xiao; Kuan Sun; Qunliang Song; Zhigang Zang; Jiangzhao Chen

doi:10.1039/D0TA12612H

Multifunctional organic ammonium salt-modified SnO₂ nanoparticles toward efficient and stable planar perovskite solar cells†

Huan Bi,

^a Xin Zuo,^b Baibai Liu,^a Dongmei He,^a Le Bai,^a Wenqi Wang,^a Xiong Li,^b Zeyun Xiao,

^c Kuan Sun,

^d Qunliang Song,

^e Zhigang Zang

*^a and Jiangzhao Chen

*^a

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* Corresponding authors

^a Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
E-mail: zangzg@cqu.edu.cn, jiangzhaochen@cqu.edu.cn

^b Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China

^c Chongqing Institute of Green and Intelligent Technology, Chongqing School, University of Chinese Academy of Sciences (UCAS Chongqing), Chinese Academy of Sciences, Chongqing, China

^d MOE Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400044, China

^e Institute for Clean Energy and Advanced Materials, School of Materials and Energy, Southwest University, Chongqing 400715, China

Abstract

Bulk and interfacial nonradiative recombination hinder the further enhancement of the power conversion efficiency (PCE) and stability of SnO₂-based planar perovskite solar cells (PSCs). To date, it is still a huge challenge to minimize the bulk and interfacial nonradiative recombination losses, and thus maximize the potentials of PCE and stability. Herein, a novel and effective multifunctional modification strategy through incorporating Girard's Reagent T (GRT) molecules with multiple functional groups to modify SnO₂ nanoparticles (NPs), which significantly reduces the bulk and interfacial nonradiative recombination losses through the simultaneous achievement of suppressing nanoparticle agglomeration, improving the electronic property of SnO₂ films, facilitating the vertical growth and enlarging the grain size of perovskite crystals, and passivating interfacial defects is reported. As a result, the device based on GRT modification delivers a much higher PCE of 21.63%, along with significantly suppressed hysteresis, as compared to the control device (19.77%). The device stability is ameliorated after GRT modification. The unencapsulated device with GRT maintains 99.5% of its initial PCE after aging at 60 °C for 720 h and 58.5% after illumination for 672 h under one sun, respectively. The present work provides guidance for the design of multifunctional modification molecules toward efficient and stable PSCs.

Journal of Materials Chemistry A

Multifunctional organic ammonium salt-modified SnO₂ nanoparticles toward efficient and stable planar perovskite solar cells†

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Multifunctional organic ammonium salt-modified SnO₂ nanoparticles toward efficient and stable planar perovskite solar cells

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Journal of Materials Chemistry A