Liu Yucheng, Zhang Yunxia, Zhu Xuejie, Yang Zhou, Ke Weijun, Feng Jiangshan, Ren Xiaodong, Zhao Kui, Liu Ming, Kanatzidis Mercouri G, Liu Shengzhong Frank
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; Institute for Advanced Energy Materials; School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, China.
Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
Sci Adv. 2021 Feb 10;7(7). doi: 10.1126/sciadv.abc8844. Print 2021 Feb.
The triple-cation mixed-halide perovskite (FA MA Cs )Pb(IBr ) (FAMACs) is the best composition for thin-film solar cells. Unfortunately, there is no effective method to prepare large single crystals (SCs) for more advanced applications. Here, we report an effective additive strategy to grow 2-inch-sized high-quality FAMACs SCs. It is found that the judiciously selected reductant [formic acid (FAH)] effectively minimizes iodide oxidation and cation deprotonation responsible for phase segregation. Consequently, the FAMACs SC shows more than fivefold enhancement in carrier lifetimes, high charge mobility, long carrier diffusion distance, as well as superior uniformity and long-term stability, making it possible for us to design high-performance self-powered integrated circuit photodetector. The device exhibits large responsivity, high photoconductive gain, excellent detectivity, and fast response speed; all values are among the highest reported to date for planar-type single-crystalline perovskite photodetectors. Furthermore, an integrated imaging system is fabricated on the basis of 12 × 12 pixelated matrixes of the single-crystal photodetectors.
三阳离子混合卤化物钙钛矿（FA MA Cs ）Pb(IBr ) （FAMACs）是用于薄膜太阳能电池的最佳成分。不幸的是，目前还没有有效的方法来制备用于更先进应用的大尺寸单晶（SCs）。在此，我们报道了一种有效的添加剂策略来生长2英寸大小的高质量FAMACs单晶。研究发现，经过精心选择的还原剂[甲酸（FAH）]能有效减少导致相分离的碘化物氧化和阳离子去质子化。因此，FAMACs单晶在载流子寿命方面提高了五倍多，具有高电荷迁移率、长载流子扩散距离以及优异的均匀性和长期稳定性，这使得我们能够设计高性能的自供电集成电路光电探测器成为可能。该器件表现出高响应度、高光导增益、出色的探测率和快速响应速度；所有这些值都是迄今为止平面型单晶钙钛矿光电探测器所报道的最高值之一。此外，基于单晶光电探测器的12×12像素矩阵制造了一个集成成像系统。
