基于无铅钙钛矿纳米材料的柔性光电探测器件的构筑及光电性能研究

近年来，柔性光电探测器在仿生电子眼和可穿戴电子设备领域发挥了越来越大的作用。目前，钙钛矿材料由于其优异的光电性能在柔性光电探测器的应用方面展示出了巨大潜力。然而目前大部分钙钛矿材料含铅元素，毒性较高，为器件长期佩戴的生物安全性埋下隐患。因此，开发无铅钙钛矿材料并应用于柔性光电探测器具有非常重要的科学价值。本项目围绕无铅钙钛矿纳米材料的开发和柔性光电探测器的构筑拟开展以下研究内容：1）无铅钙钛矿材料的可控制备与光电性能研究，重点研究铅元素被替代后材料的光电性能变化规律；2）在优化材料光电性能的基础之上，构筑柔性光电探测器，通过物理和化学手段对界面官能团进行调控，提高柔性电极与无铅钙钛矿层之间的结合能力和载流子输运能力，进一步优化器件的机械稳定性和光电性能；3）在获得高性能器件的基础之上，研究器件中载流子产生和层间输运等基本物理问题，建立理论模型，构建“材料成分调控-器件性能优化”的内在联系。

In recent years, flexible photodetectors have played an increasingly important role in the field of biomimetic eyes and wearable electronics. Nowadays, perovskite materials open up a great opportunity for the flexible photodetector because of their excellent photoelectric properties. However, most of the perovskite materials contain lead, which is highly toxic to human beings and the ecosystem. Especially in flexible and wearable electronics, the containing lead keeps perovskite materials away from long-term wearing for biological safety concern. Therefore, developing lead-free perovskite materials and exploring their application in flexible photodetectors are significant to the scientific community. Based on the development of lead-free perovskite nanomaterials and the construction of flexible photodetectors, the research content of the proposal can be summarized as follows: 1) To study the controllable synthesis and photoelectric properties of lead-free perovskite materials, especially the variation tendency of photoelectric properties in lead-free perovskite materials after replacing lead; 2) On the basis of optimizing the photoelectric properties of materials, to construct the flexible photodetectors and to regulate the interfaces of each layer in devices through physical and chemical strategies, further to improve the binding force and carrier transportation between the flexible electrodes and the lead-free perovskite materials, thereby enhancing the mechanical stability and photoelectric properties of the flexible photodetectors; 3) On the basis of constructing high-performanced flexible photodetectors, to study fundamental physical issues of the generation and transportation of carriers in devices, to establish the theoretical model, and to build the connection between the regulation of material composition and the optimization of device performances.