Gao Zhan, Zheng Yifan, Zhao Dan, Yu Junsheng
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China.
Nanomaterials (Basel). 2018 Oct 4;8(10):787. doi: 10.3390/nano8100787.
Owing to the superior properties of optical and electronic properties, perovskite single crystals have been in high demand recently. However, the growth of large-sized single crystals requires several processing steps and a long growth time, which engenders great difficulties in device integration. Herein, benzophenone (BP) was firstly introduced as a crystallizing agent to facilitate the construction of a high-quality CH₃NH₃PbBr₃ (MAPbBr₃) film consisting of micron-scale single crystals in a one-step spin-coating method. We studied the influence of the BP concentration upon the size and shape of the micron-scale single crystals. Moreover, due to the enhanced morphology of the MAPbBr₃ film with low-defect micron-scale single crystals, perovskite light-emitting diodes (PeLEDs) have been demonstrated with a maximum luminance of 1057.6 cd/m² and a turn-on voltage as low as 2.25 V. This approach not only proposes a concise and highly repeatable method for the formation of micron-scale perovskite single crystals, but also paves a way for the realization of efficient PeLEDs.
由于钙钛矿单晶具有优异的光学和电学性能，近年来对其需求一直很高。然而，大尺寸单晶的生长需要几个加工步骤和较长的生长时间，这给器件集成带来了很大困难。在此，首次引入二苯甲酮（BP）作为结晶剂，以一步旋涂法促进由微米级单晶组成的高质量CH₃NH₃PbBr₃（MAPbBr₃）薄膜的构建。我们研究了BP浓度对微米级单晶尺寸和形状的影响。此外，由于具有低缺陷微米级单晶的MAPbBr₃薄膜的形貌得到改善，已证明钙钛矿发光二极管（PeLED）的最大亮度为1057.6 cd/m²，开启电压低至2.25V。这种方法不仅为微米级钙钛矿单晶的形成提出了一种简洁且高度可重复的方法，也为实现高效PeLED铺平了道路。
