journal article·2022-08-31

Synergistic Effects of Bipolar Additives on Grain Boundary-Mediated Charge Transport for Efficient Carbon-Based Inorganic Perovskite Solar Cells

Yantao Mei, Xiayao Lu, Chen Dong, Furui Tan, Minghuan Cui, Yuki Haruta, Vishal Yeddu, Mengyue Wang, Kong Liu, Gentian Yue, Yueyue Gao, Shengchun Qu, Chaochao Qin, Weifeng Zhang, Liming Ding, Makhsud I. Saidaminov, Zhijie Wang

ACS Applied Materials & Interfaces· Volume 14· Issue 34
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Abstract

Carbon-based all-inorganic CsPbIxBr3–x perovskite solar cells offer high stability against heat and humidity and a suitable band gap for tandem and semitransparent photovoltaics. In CsPbIxBr3–x perovskite films, the defects at grain boundaries (GBs) cause charge trapping, reducing the efficiency of the cell. Electronic deactivation of GB has been a conventional strategy to suppress the trapping, but at the cost of charge carrier transport through the boundaries. Here, we turn the GBs into benign charge transport pathways with the aid of bipolar charge transport semiconductors, namely, Ti3C2TX (MXene) and Spiro-OMeTAD, respectively. Thanks to the synergistic effects of both n- and p-type transport media, the charge transport is improved and balanced at the GBs. As a result, the cells achieve an efficiency of 12.7%, the highest among all low-temperature-processed carbon-based inorganic perovskite solar cells. Benign GBs also lead to enhanced light and aging stabilities. Our work demonstrates a proof-of-concept strategy of benign electronic modulation of GBs for solution-processed perovskite solar cells.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Solid-state spectroscopy and crystallography

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng 475004, P. R. China

Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, Henan Normal University, Xinxiang 453007, P. R. China

Department of Chemistry and Electrical & Computer Engineering, Centre for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, Victoria V8P5C2, Canada

Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japan

Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, P. R. China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Funding

Ministry of Science and Technology of the People's Republic of China · China Postdoctoral Science Foundation · Natural Sciences and Engineering Research Council of Canada · Henan University · Chinese Academy of Sciences · Henan Province · Science and Technology Development Project of Henan Province

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