Aqueous synthesis of perovskite precursors for highly efficient perovskite solar cells

• 成果类型: Article
• 署名作者: Zhu, Peide; Wang, Deng; Zhang, Yong; Liang, Zheng; Li, Jingbai; Zeng, Jie; Zhang, Jiyao; Xu, Yintai; Wu, Siying; Liu, Zhixin; Zhou, Xianyong; Hu, Bihua; He, Feng; Zhang, Lin; Pan, Xu; Wang, Xingzhu; Park, Nam-Gyu; Xu, Baomin
• 署名单位: Southern University of Science & Technology; Southern University of Science & Technology; Southern University of Science & Technology; City University of Hong Kong; Chinese Academy of Sciences; Hefei Institutes of Physical Science, CAS; Shenzhen Polytechnic University; Southern University of Science & Technology; Harbin Institute of Technology; Central South University; Southern University of Science & Technology; Sungkyunkwan University (SKKU); Sungkyunkwan University (SKKU); Sungkyunkwan University (SKKU)
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9621
• DOI: 10.1126/science.adj7081
• 发表日期: 2024-02-02
• 页码: 524-+
• 关键词: carrier dynamics; crystals; STATES; increase; defects

摘要

High-purity precursor materials are vital for high-efficiency perovskite solar cells (PSCs) to reduce defect density caused by impurities in perovskite. In this study, we present aqueous synthesized perovskite microcrystals as precursor materials for PSCs. Our approach enables kilogram-scale mass production and synthesizes formamidinium lead iodide (FAPbI(3)) microcrystals with up to 99.996% purity, with an average value of 99.994 +/- 0.0015%, from inexpensive, low-purity raw materials. The reduction in calcium ions, which made up the largest impurity in the aqueous solution, led to the greatest reduction in carrier trap states, and its deliberate introduction was shown to decrease device performance. With these purified precursors, we achieved a power conversion efficiency (PCE) of 25.6% (25.3% certified) in inverted PSCs and retained 94% of the initial PCE after 1000 hours of continuous simulated solar illumination at 50 degrees C.