基于WS2/Ta2Pd3Se8混合维度异质结能带工程的电荷转移机制与调控

低维半导体材料体系界面间存在高效电荷转移过程，是其作为新一代高性能电子和光电器件的理论前提。本项目在前期基于二维异质结电荷转移能带工程调控的基础上进一步拓展研究，旨在完善低维界面间电荷转移理论体系和相关器件性能优化与功能拓展，解决在低维异质结界面研究与器件应用中面临的科学问题。为此，首先构筑基于可剥离的新型一维半导体材料Ta2Pd3Se8及二维层状半导体材料WS2的混合维度异质结，研究其高效可控制备方法。通过电子输运、稳态荧光和拉曼光谱、光电响应等测量手段，研究基于能带工程的混合维度界面间电荷转移规律和调控机制，并结合二维和一维体系各自优势，完善低维界面间高效电荷转移的清晰物理图像。在此基础上，进行混合维度异质结光电器件设计与开发，从接触模式、晶格取向、界面处理等角度开展器件性能优化和功能拓展，促进混合维度异质结界面基础研究与新型光电器件开发。

Efficient charge transfer process is generally existed between interfaces built by low dimensional semiconducting materials, which is the fundamental basis for next generation of high performance electric and optoelectronic devices. Based on our earlier research background on the study of charge transfer manipulation through two dimensional heterostructure band engineering, this project aims to unravel the remaining puzzles for low dimensional charge transfer mechanisms and its manipulations, so as to broaden the functionality and improve the performance of related devices based on low dimensional heterostructures, and finally promote their practical applications. For this purpose, our project will build mixed-dimensional heterostructures based on exfoliated one-dimensional (1D) semiconducting Ta2Pd3Se8 and two-dimensional (2D) semiconducting WS2 with high efficiency and controllability, which will serve as a unique platform for studying high efficiency charge transfer processes between low dimensional interfaces through electronic transport, steady state spectroscopy, photoresponse studies, etc. Based on band engineering by controlling the thickness and alignment of these two materials, we will be able to uncover the underlying manipulation mechanisms as interplayed with the peculiarities from both 1D and 2D systems. Besides, we will design and develop the optoelectronic devices based on this mixed-dimensional heterostructure. By studying the contacting mode, crystal orientation dependence, and interface treatments, this project will promote the fundamental studies of mixed-dimensional interfaces and their practical applications.