Pure 2D Perovskite Formation by Interfacial Engineering Yields a High Open-Circuit Voltage beyond 1.28 V for 1.77-eV Wide-Bandgap Perovskite Solar Cells

Rui He; Zongjin Yi; Yi Luo; Jincheng Luo; Qi Wei; Huagui Lai; Hao Huang; Bingsuo Zou; Guangyao Cui; Wenwu Wang; Chuanxiao Xiao; Shengqiang Ren; Cong Chen; Changlei Wang; Guichuan Xing; Fan Fu; Dewei Zhao

doi:10.1002/advs.202203210

Pure 2D Perovskite Formation by Interfacial Engineering Yields a High Open-Circuit Voltage beyond 1.28 V for 1.77-eV Wide-Bandgap Perovskite Solar Cells

Adv Sci (Weinh). 2022 Dec;9(36):e2203210. doi: 10.1002/advs.202203210. Epub 2022 Nov 13.

Authors

Rui He¹, Zongjin Yi¹, Yi Luo¹, Jincheng Luo¹, Qi Wei², Huagui Lai³, Hao Huang⁴, Bingsuo Zou⁴, Guangyao Cui¹, Wenwu Wang¹, Chuanxiao Xiao⁵, Shengqiang Ren¹, Cong Chen¹, Changlei Wang⁶, Guichuan Xing², Fan Fu³, Dewei Zhao¹

Affiliations

¹ College of Materials Science and Engineering & Institute of New Energy and Low-Carbon Technology, Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education, Sichuan University, Chengdu, 610065, P. R. China.
² Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau, 999078, P. R. China.
³ Laboratory for Thin Films and Photovoltaics, Empa - Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, Duebendorf, CH-8600, Switzerland.
⁴ Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, P. R. China.
⁵ Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo New Material Testing and Evaluation Center Co., Ltd, Ningbo City, 315201, P. R. China.
⁶ School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, 215006, P. R. China.

Abstract

Surface post-treatment using ammonium halides effectively reduces large open-circuit voltage (V_OC ) losses in bromine-rich wide-bandgap (WBG) perovskite solar cells (PSCs). However, the underlying mechanism still remains unclear and the device efficiency lags largely behind. Here, a facile strategy of precisely tailoring the phase purity of 2D perovskites on top of 3D WBG perovskite and realizing high device efficiency is reported. The transient absorption spectra, cross-sectional confocal photoluminescence mapping, and cross-sectional Kelvin probe force microscopy are combined to demonstrate optimal defect passivation effect and surface electric-field of pure n = 1 2D perovskites formed atop 3D WBG perovskites via low-temperature annealing. As a result, the inverted champion device with 1.77-eV perovskite absorber achieves a high V_OC of 1.284 V and a power conversion efficiency (PCE) of 17.72%, delivering the smallest V_OC deficit of 0.486 V among WBG PSCs with a bandgap higher than 1.75 eV. This enables one to achieve a four-terminal all-perovskite tandem solar cell with a PCE exceeding 25% by combining with a 1.25-eV low-bandgap PSC.

Keywords: interfacial passivation; organic arylammonium salts; perovskite solar cells; wide-bandgap perovskites.

Abstract

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