journal article·2021-06

In‐Situ Hot Oxygen Cleansing and Passivation for All‐Inorganic Perovskite Solar Cells Deposited in Ambient to Breakthrough 19% Efficiency

Kang Wang, Changji Gao, Zhuo Xu, Qingwen Tian, Xiaojing Gu, Lu Zhang, Shiang Zhang, Kui Zhao, Shengzhong (Frank) Liu

Advanced Functional Materials· Volume 31· Issue 25
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Abstract

Abstract All‐inorganic perovskite CsPbI3 has attracted extensive attention recently because of its excellent thermal and chemical stability. However, its photovoltaic performance is hindered by large energy losses (Eloss) due to the presence of point defects. In addition, hydroiodic acid (HI) is currently employed as a hydrolysis‐derived precursor of intermediate compounds, which often leads to a small amount of organic residue, thus undermining its chemical stability. Herein, an in‐situ hot oxygen cleansing with superior passivation (HOCP) for the triple halide‐mixed CsPb(I2.85Br0.149Cl0.001) perovskite solar cells (abbreviated as CsPbTh3) deposited in an ambient atmosphere to reduce the Eloss to as low as 0.48 eV for the power conversion efficiency (PCE) to reach 19.65% is demonstrated. It is found that the hot oxygen treatment effectively removes the organic residues. Meanwhile, it passivates halide vacancies, hence reduces the trap states and nonradiative recombination losses within the perovskite layer. As a result, the PCE is increased significantly from 17.15% to 19.65% under 1 sun illumination with an open‐circuit voltage enlarged to 1.23 from 1.14 V, which corresponds to an Eloss reduction from 0.57 to 0.48 eV. Also, the HOCP‐treated devices exhibit better long‐term stability. This insight should pave a way for decreasing nonradiative charge recombination losses for high‐performance inorganic perovskite photoelectronics.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties

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

Affiliations

Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University No. 620, West Chang'an Avenue Xi'an 710119 P. R. China

School of Materials Science & Engineering Key Laboratory of Powder Material & Advanced Ceramics International Scientific & Technological Cooperation Base of Industrial Waste Recycling and Advanced Materials North Minzu University No. 204, Wenchang North Street Yinchuan Ningxia 750021 P. R. China

School of Electrical and Control Engineering Shaanxi University of Science & Technology Xi'an Weiyang University Park Xi'an 710021 P. R. China

Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences No. 457, Zhongshan Road Dalian Liaoning 116023 P. R. China

University of the Chinese Academy of Sciences Beijing 100039 P. R. China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Fundamental Research Funds for the Central Universities

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