Lin Congjian, Liu Lai, Xu Jinzhuo, Fang Feier, Jiang Ke, Liu Zexiang, Wang Ye, Chen Fuming, Yao Huizhen
SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, College of Optoelectronic Engineering, Shenzhen University Shenzhen 518060 China
Key Laboratory of Material Physics of Ministry of Education, School of Physics and Engineering, Zhengzhou University Zhengzhou 450052 China.
RSC Adv. 2020 Jun 1;10(35):20745-20752. doi: 10.1039/d0ra01239d. eCollection 2020 May 27.
The emerging metal-halide perovskites are promising for next generation optoelectronic devices. Recently, all-inorganic halide perovskites have been developed and show significantly improved stability compared with organic-inorganic hybrid halide perovskites. Here, we report a facile method based on the coffee ring effect of solvents to synthesize dual-phase CsPbBr-CsPbBr single crystal microsheets for the first time. The prepared dual-phase CsPbBr-CsPbBr single crystal is composed of a tetragonal crystalline phase of CsPbBr and a monoclinic phase of CsPbBr according to X-ray diffraction (XRD) patterns. The sharp XRD peaks indicate the high crystallinity of the as-synthesized dual-phase CsPbBr-CsPbBr microsheets. CsPbBr is mainly distributed on the edge of the microsheets based on photoluminescence (PL) mapping images. Besides, a photodetector based on the dual-phase CsPbBr-CsPbBr microsheets exhibits good performance with a high on/off photocurrent ratio of 300 and a photoresponsivity of 2.68 mA W. The rise and decay times of the CsPbBr-CsPbBr microsheet photodetector are around 25.3 ms and 29.6 ms, respectively. The experimental results indicate that the dual-phase CsPbBr-CsPbBr microsheet could be a good candidate for the fabrication of high-performance micro photodetectors compatible with practical applications.
新兴的金属卤化物钙钛矿在下一代光电器件方面具有广阔前景。最近，全无机卤化物钙钛矿已被开发出来，与有机-无机杂化卤化物钙钛矿相比，其稳定性有显著提高。在此，我们首次报道了一种基于溶剂咖啡环效应的简便方法来合成双相CsPbBr₃-CsPbBr₂单晶微片。根据X射线衍射（XRD）图谱，所制备的双相CsPbBr₃-CsPbBr₂单晶由CsPbBr₃的四方晶相和CsPbBr₂的单斜晶相组成。XRD峰尖锐表明所合成的双相CsPbBr₃-CsPbBr₂微片具有高结晶度。基于光致发光（PL）映射图像，CsPbBr₃主要分布在微片边缘。此外，基于双相CsPbBr₃-CsPbBr₂微片的光电探测器表现出良好性能，开/关光电流比高达300，光响应度为2.68 mA/W。CsPbBr₃-CsPbBr₂微片光电探测器的上升和衰减时间分别约为25.3 ms和29.6 ms。实验结果表明，双相CsPbBr₃-CsPbBr₂微片有望成为制造与实际应用兼容的高性能微型光电探测器的良好候选材料。
