新型自驱动光探测器及其力-光-电耦合机制研究

Self-powered photodetector has became a hot spot in recent years, which can spontaneously collect energy from the external environment to self driven. Contrast with the piezoelectric effect, triboelectric effect with higher electrical output, wider sensitive sensing range and more material selection was extensively used in many reserches on the self-powered sensors. This project will present a new type self-powered photodetector based on the joint properties of triboelectric effect and photoelectric effect, by utilizing the transport characteristics of photon generated carriers in the composite ferroelectric material to modulate the tribo-induced charge quantity between the electrodes. The regularity and mechanism of the charge generation, separation and migration in the devices are revealed by micro measuring of surface charge density and internal photoconductivity. This project will broaden the research scope of the self-powered photodetector and lay the foundation for the development of the new energy conversion devices.

自驱动光探测器能从外界环境中收集能量并进行自我驱动，成为了近些年研究的热点。摩擦效应可以产生比压电更高的电信号输出，拥有更敏感的传感范围和更多的材料选择，被广泛应用于自驱动传感器件的研究。本项目开发了一种基于摩擦-光电耦合效应的新型自驱动光探测器，利用复合铁电材料光生载流子输运特性实现对探测器电极间摩擦感应电荷转移量的调制。通过观测材料微区表面电荷密度和内部光电导率变化，揭示器件中电荷产生、分离和迁移的规律及机理，构建基于力-光-电耦合效应的高效探测机制并开发其他新型能量转换器件。本项目将拓宽自驱动光探测器的研究范畴并为新型能量转换器件的开发奠定基础。

本研究利用化学溶液沉积法，制备了新型铁电材料Ag2O-BNdT和其他多种多功能光电子材料。在此基础上开发了一种基于摩擦-光电耦合效应的新型自驱动光探测器，利用复合铁电材料光生载流子输运特性实现对探测器电极间摩擦感应电荷转移量的调制。此外，详细研究了基于力-光-电耦合效应的高效探测机制并在此机制的启发下开发了其他多种高性能能量转换器件。本项目的完成将拓宽自驱动光探测器的研究范畴并为新型能量转换器件的开发奠定基础。