超窄带隙聚合物半导体材料及其超薄光电传感器件研究

Photodetectors based on organic / polymer semiconductor materials have attracted more and more attentions in academia and industry because of their unique properties of light weight, flexibility, low cost and so on. Among the organic semiconductors, polymers always show broadening of the spectrum comparing with small molecules and display more extension of optical sensor applications field. However, the designing of ultra-low band gap polymers and preparing high performance detectors are very difficult. This project will be based on the previous experience of the applicant to solve the scientific problems in ultra narrow gap molecular materials and their related sensors. Ultra narrow band gap (0.6-0.8 eV) of the polymeric semiconductor materials will be synthesized. The relationship between interface controlling and photosensitivity will be studied. High performance ultrathin polymeric photosensors with wide spectrum (370-2000 nm) will be prepared and a comprehensive study will be done in this project. Finally, the research of integrated imaging of flexible sensor devices will be also explored.

基于有机半导体材料的光电探测器以其质量轻、柔性、溶液法可加工、低成本等特性受到了学术界和工业界越来越多的关注。其中有机聚合物半导体分子相对于有机小分子半导体分子往往拥有更宽的吸收光谱和更广阔的应用前景。然而超窄带隙聚合物半导体材料的设计以及器件的应用，仍然存在着很大的困难。本项目将在申请者已有的工作基础上，针对超窄带隙分子材料与光传感器件面临的科学问题，以合成具有超窄带隙（0.6-0.8 eV）的聚合物半导体材料为基础；以研究传感器的界面调控与光敏感度的关系为切入点；以制备高性能宽光谱(370-2000 nm)超薄聚合物光传感器为目标，全面研究超窄带隙聚合物半导体材料及其超薄光电传感器件，并探索柔性超薄传感器件的集成成像研究。

基于聚合物半导体材料的超窄带隙分子受到了人们的广泛关注。因为利用该类材料制备的器件不仅具备了对可见光区的成像特点，在近红外区的响应还极大的拓展了有机光探测器在远程光控制和环境监测等方面的应用。但也面临着材料体系缺乏、性能低和成像器件研究不足等缺点。依托项目的支持，项目研究团队设计合成靛蓝类和喹喔啉类等超窄带隙有机聚合物分子材料，其PBTTQCN-TT材料的最窄带隙达到了0.66 eV。基于超窄带隙材料通过溶液法加工和异质结构设计，制备了晶体管型的红外传感器，光暗电流比>10^4，峰值探测率D*>10^13 Jones. 其中柔性探测器的弯曲半径小于5微米，曲挠次数>5000次。通过器件的阵列集成，实现了类视网膜的红外成像。为未来柔性、低成本的红外探测研究提供了新思路。共发表致谢论文33篇，申请相关发明专利6项，授权2项。