CAREER: Graphene Heterostructures Based Hot Carrier Optoelectronics

目的：本研究的目的是研究石墨烯中的非平衡热载流子动力学，并探索新型石墨烯异质结器件用于热载流子光电应用。该方法是基于扫描光电流技术与飞秒时间延迟测量技术的集成。该项目还旨在展示一种新型的基于石墨烯异质结构的高响应度超宽带红外光电探测器。智力优势：智力优势是石墨烯基热载流子光电子学的先驱。飞秒扫描光电流测量技术可以应用于其他光电器件，石墨烯中热载流子动力学的研究将有助于提高对低维光电物理的基本认识。石墨烯异质结晶体管中的热载流子隧穿介导的光响应也将导致新的光电探测机制，非常适合中远红外应用。更广泛的影响：这项研究具有高度的变革性，将产生一种新型的室温宽带红外探测器，具有无与伦比的灵敏度。求婚？对基础科学、纳米材料和器件物理学的重视将加强本科和研究生阶段的科学和工程教育。拟议的外展活动也将提高K-12和本科生对纳米科学和纳米技术的认识和兴趣。该计划将重点从代表性不足的群体中招收学生。从这项研究中获得的知识和技术将被纳入本科课程的修订和一个新的研究生课程的发展，重点是碳纳米材料。

Objective: The objective of this proposal is to study the nonequilibrium hot carrier dynamics in graphene, and to explore novel graphene heterostructure devices for hot carrier optoelectronic applications. The approach is based on the integration of scanning photocurrent technique with femtosecond time-delay measurement technique. The proposal also aims to demonstrate a new type of graphene heterostructure based ultra-broadband infrared photodetector with high responsivity.Intellectual Merit: The intellectual merit is the pioneering of graphene based hot carrier optoelectronics. The femtosecond scanning photocurrent measurement technique can be applied to other optoelectronic devices, and the investigation of hot carrier dynamics in graphene should improve the fundamental understanding of optoelectronic physics in low dimension. The hot carrier tunneling mediated photoresponse in graphene heterostructure transistors will also lead to new photodetection mechanism ideal for mid-far infrared applications. Broader Impacts: The proposed research is highly transformative and will generate a new type of room temperature broadband infrared detector with unparalleled sensitivity. The proposal?s strong emphasis on basic science, nanoscale material, and device physics will enhance science and engineering education at both undergraduate and graduate level. The proposed outreach activities will also promote the awareness and interest in nanoscience and nanotechnology for K-12 and undergraduate students. This program will place emphasis on recruiting students from underrepresented groups. Knowledge and technologies gain from this research will be incorporated into undergraduate course revision and the development of a new graduate course focusing on carbon nanomaterials.