journal article·2021-07-09

Multiple-Defect Management for Efficient Perovskite Photovoltaics

Xiaoyu Yang, Yue Ni, Yuzhuo Zhang, Yanju Wang, Wenqiang Yang, Deying Luo, Yongguang Tu, Qihuang Gong, Haifeng Yu, Rui Zhu

ACS Energy Letters· Volume 6· Issue 7
Publisher page

Abstract

A variety of defects exist on the crystalline surfaces of solution-processed polycrystalline perovskites, resulting in photovoltaic output losses and subsequent degradations. It is necessary to develop a versatile passivator that can concurrently eliminate multiple defects, including vacancy, interstitial, antisite substitution, and dissociative I2. Herein, we focus on multiple-defect management to optimize defective perovskite surfaces by using three kinds of chemical bonds with a pyridine-containing polymeric agent. Coordination bonds alleviate the distorted PbIx octahedrons by digesting I vacancies, and hydrogen bonds stabilize ammonium cations to eliminate organic vacancies and deep-level antisite defects. Furthermore, the dissociated I2 acting as electron traps from the coupled I interstitials could be blocked by supramolecular halogen bonds. Based on the low-defect perovskite films, substantial increases in photovoltaic efficiencies, going up to 22.02% and 23.14%, are achieved in planar and mesoporous devices, respectively, with nonencapsulated cells retaining 90% of their original efficiencies after 2200 h of aging in ambient conditions.
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Research context

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

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

Affiliations

State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871, China

School of Materials Science and Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, China

Department of Materials Science and Engineering, University of Toronto, Toronto M5G 3E4, Canada

Frontiers Science Center for Flexible Electronics, Xi’an Institute of Flexible Electronics (IFE) and Xi’an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China

Peking University Yangtze Delta Institute of Optoelectronics, Nantong, Jiangsu 226010, China

Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Shaanxi Province

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