窄带多光谱探测技术在国防、机器视觉、物联网、医药化学、食品安全等领域具有巨大应用前景。基于钙钛矿材料的优异光电特性，近年来新型钙钛矿窄带多光谱探测器已成为该领域新兴前沿方向，但目前仍存在外量子效率低、响应速度慢、多光谱响应难以同时片上集成等难点。本课题围绕上述关键问题开展研究，建立通过p型（饱和溶液）和n型（膜）钙钛矿界面相溶结合构筑p-i-n型钙钛矿同质结的新方法，实现可控制备；构建基于p-i-n型钙钛矿同质结的新型窄带多光谱光电探测器，建立光电耦合模型，阐明光生载流子产生、分离、输运、收集的机理与途径，阐明p-i-n型钙钛矿同质结对加强载流子分离和加速载流子输运的影响，及其对提升器件外量子效率和响应速度的作用机理；优化器件结构设计和制备工艺，并通过喷墨打印技术实现柔性多光谱响应器件片上集成。本项目的研究将为高效率、快响应柔性钙钛矿窄带多光谱探测器的研制提供理论支持和技术指导。

Narrowband multispectral photodetectors have demonstrated their huge potential and promising applications in the areas of national defense, machine vision, internet of things, medical chemistry, food safety etc.. Based on the outstanding optoelectronic properties of the organic-inorganic perovskite materials, in recent years, research projects concerning the perovskite narrowband multispectral photodetectors become the cutting-edge topics. However, for further development, several bottleneck issues should be overcome including the slow response speed, relatively low external quantum efficiency (EQE), and difficult to integrate on one chip. We propose this project to deal with those bottleneck issues mentioned above. The key creativity is to construct the perovskite p-i-n homojunction within the active layer through the means of deposition p-type saturated perovskite solution on top of the cured n-type perovskite thin film. On the basis of the p-i-n homojunction, a new narrowband multispectral photodetector will be built to demonstrate our ideas. Besides, opto-electrical models will be construct to unravel the hidden mechanism of the dissociation, transportation, and collection of the photogenerated charge carriers. Focus will be put on the explanation of the influence of the p-i-n homojunction on enhanced dissociation and fast transportation of the photogenerated charge carriers. The mechanism of improvement of EQE and increased response speed of the photodetector will also be discussed in details. Within this project, the device structure and fabrication techniques will be optimized. Through inkjet printing method, flexible and multispectral response photodetector will be realized for large-scale and on-chip integration. This project targeting at fast response, high efficiency, and flexible narrowband multispectral photodetectors whose fruitful results will provide technical support and theoretical guidance for the next generation photodetector.