石墨烯-自组织量子点复合结构红外探测器的制备与机理研究

项目名称： 石墨烯-自组织量子点复合结构红外探测器的制备与机理研究

项目编号： No.61474130

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 陈刚

作者单位： 中国科学院上海技术物理研究所

项目金额： 83万元

中文摘要： 目前对石墨烯的研究重心正逐渐从基础物理向微纳电子学器件和光电子学应用领域转移。在此背景下，本项目将探索制备高效率石墨烯红外光电探测器的有效途径。通过分子束外延生长InAs和Ge量子点作为光吸收层，构建石墨烯-量子点复合材料，解决石墨烯单层或稀层光响应低的难题;探索制备高质量石墨烯-自组织量子点复合结合的有效技术途径。建立石墨烯-量子点复合材料场效应管红外探测器的制备方法。剖析石墨烯-自组织量子点复合结构对石墨烯形貌和电子态的影响，揭示复合材料中的电子-空穴对形成和分离等过程，探究石墨烯-量子点界面肖特基势垒和内建电场的结构和形成机制，澄清与之对应的光电流响应机理，为实现高探测效率的红外探测器提供基本的依据。

中文关键词： 红外探测器；石墨烯；分子束外延；增益；场效应管

英文摘要： Recent research interests on graphene are shifting from the fundamental physics to its nanoelectronic and photoelectronic applications. In this proposal, we will probe the strategy to fabricate graphene-based Infrared photodetectors with high gain and high efficiency. A field-effect transistor (FET) photodetector based on graphene-self assembled quantum dots hybrid materials will be designed and fabricated to overcome the low photoresponse of the single Layer or few layer graphene photodetectors. InAs and Ge self-assembled quantum dots will be grown by molecular beam epitaxy (MBE). The technical routes for the fabrication of the hybrid photodetecting materials as well as the FET photodetectors will be developed. The influences on the morphological and electronic states of the graphene from the hybrid materials are to be clarified. The creation and separation of the electron-hole pairs, the structure and formation of the Schottky barriers, as well as the photoresponse mechanism in the hybrid materials will also be elucidated. Based on these efforts, the infrared photodetectors with high efficiency will be achieved as promised by the ultra-high carrier mobility of graphene.

英文关键词： Infrared Photodetector;Graphene;Molecular Beam Epitaxy;Gain;Field Effect Transistor