基于界面电荷转移的关联荧光辐射行为的调控与表征

半导体器件的核心是其内部多样化的电子运动，控制低维半导体异质结界面的载流子传输（交换），可以实现诸多不同寻常的物理化学性质与量子现象。本项目从弱界面相互作用条件下二维发光材料单元间的间歇性界面电荷转移行为出发，利用光、电等外场手段对I型和II型二维异质结中电子和空穴传输行为进行精细调控，探索一系列新奇动态荧光辐射现象的可控实现方法，包括相关性符号、动态变化规律的调控以及动态光电流、交变光电流信号的获取等。在开展上述探索性研究同时，积极发展密切相关的动态、多通道的新型光谱学分析与光学成像方法。通过这些基于界面电荷转移的动态关联荧光信号、交变光电流信号的获取、调控与表征实验，我们将深入认识与理解二维异质结界面载流子运动规律，发展纳尺度界面载流子行为的系统调控方法，相关研究成果将为新型光电器件的设计与开发提供新思路。

The diverse internal electronic motions are heart factors for semiconductor devices. Control of carrier transport (exchange) at low-dimensional semiconductor heterojunction interfaces, enables many unusual physical/chemical properties and observation of quantum phenomena. This project is motivated by the intriguing intermittent charge transfer behavior in weakly contacted 2D semiconductor heterojunctions with appropriate interfacial interactions. With the aid of light or an electrical filed, we will explore ways towards fine control on motions of electron/holes in both type I and type II heterostructures, and towards the realization of a series of novel phenomena related with dynamically correlated fluorescence emission, including switching of correlation sign, state-distribution control, “blinking” photo-current, or even acquisition of alternating photo-current signals. Meanwhile, we will develop a series of novel dynamic, multi-channel spectroscopy and optical imaging methods for further in-depth investigations. Through the above studies on acquisition, control and characterization of dynamically correlated fluorescence emission and blinking/alternating photo-current signals, we will have a better understanding on the general rules of carrier motions at 2D heterojunction interface, which helps to develop systematic strategies towards controllable carrier motions at nanoscale interface. Our study will provide new concepts for the design/development of novel semiconductor optoelectronic devices.