摘要
石墨烯具有从紫外到太赫兹波段范围内的超宽吸收光谱、超高载流子迁移率和超快光响应速度,被认为是制作快速光电探测器的理想材料。然而,具有一个原子层厚度的石墨烯的光吸收仅为2.3%,同时石墨烯载流子皮秒量级的超快复合速率,导致石墨烯光电探测器的光响应度较低,为几十甚至零点几mA/W。为此,科研人员提出了多种提高石墨烯光电探测器光响应度的方法,使石墨烯光电探测器的光响应度获得显著提升,目前最高已达到107 A/W。综述近年增强石墨烯光电探测器光响应度的研究进展,分析各种方法的特点,讨论石墨烯光电探测器未来可能的发展趋势和前景。
Graphene has distinguished characteristics of ultra-wide absorption spectrum from ultraviolet to terahertz,ultra-high carrier mobility,ultra-fast photoresponse speed and so on.Graphene is considered to be the candidate for making fast photodetectors.However,graphene absorbs only 2.3% of light because of the thin film thickness of one atomic layer.Furthermore,graphene carriers usually recombine within picoseconds.These two factors lead to a low photoreponsivity up to tens of mA/W for graphene photodetectors.Therefore,researches have been focused on how to improve the photoresponsivity of graphene photodetectors and achieved positive results.Up to now,the highest photoresponsivity of 107 A/W is impressive.Thus,researches a-bout enhancing photoresponsivity of graphene photodetectors will be reviewed.Characteristics of different methods and the future development of graphene photodetector will be discussed and analyzed at the same time.
作者
王兰喜
周晖
张凯锋
王虎
曹生珠
熊玉卿
王金晓
高恒蛟
李学磊
李坤
周超
WANG Lanxi;ZHOU Hui;ZHANG Kaifeng;WANG Hu;CAO Shengzhu;XIONG Yuqing;WANG Jinxiao;GAO Hengjiao;LI Xuelei;LI Kun;ZHOU Chao(Science and Technology on Vacuum Technology of Physics,Lanzhou and Physics Laboratory,Lanzhou Institute 730000,CH)
出处
《光电子技术》
CAS
北大核心
2018年第3期151-161,166,共12页
Optoelectronic Technology
基金
国家自然科学基金项目(No.61405084)
关键词
石墨烯
光电探测器
光电响应度
研究进展
Graphene
photodetector
photoresponsivity
recent research progress
