石墨烯/钽酸锂场效应晶体管温度电阻特性研究  

Temperature-Resistance Behavior of Graphene/Lithium Tantalate Field Effect Transistor

作　　者：金庆喜 连紫薇 赵永敏 明安杰 魏峰 毛昌辉[1,2,3] Jin Qingxi;Lian Ziwei;Zhao Yongmin;Ming Anjie;Wei Feng;Mao Changhui(State Key Laboratory of Advanced Materials for Smart Sensing,China GRINM Group Co.,Ltd.,Beijing 101407,China;GRIMAT Engineering Institute Co.,Ltd.,Beijing 101407,China;General Research Institute for Non-ferrous Metals,Beijing 100088,China)

机构地区：[1]中国有研科技集团有限公司智能传感功能材料国家重点实验室,北京101407 [2]有研工程技术研究院有限公司先进电子材料事业部,北京101407 [3]北京有色金属研究总院,北京100088

出　　处：《稀有金属》2024年第7期1056-1062,共7页Chinese Journal of Rare Metals

基　　金：国家自然科学基金面上项目(61874137);国家重点研发计划项目(2019YFB2005705);山东省重点研发计划项目(2020CXGC010203)资助。

摘　　要：二维石墨烯材料的原子尺度厚度和其可调的能带结构使其对电介质环境高度敏感,从而使得石墨烯/电介质材料体系对外界多种物理量有敏感响应特性。通过制备石墨烯/钽酸锂热释电栅场效应晶体管并分析该体系的电学传输特性,研究了石墨烯/钽酸锂体系对温度的敏感性,证明该体系中石墨烯载流子浓度的变化与外界温度的变化成正比。场效应晶体管器件在不同温度下的伏安特性表明,25℃时石墨烯沟道的阻值约为3850Ω,随着温度的升高电阻变大。器件的温度响应曲线表明,当温度升高至61.2℃时,该体系电阻达到最大值(7900Ω),继续升温电阻减小。当温度(T)介于30~61.2℃之间时,其温度电阻系数(TCR)约为3.2%·℃^(-1),当温度介于61.2~66℃之间时,其TCR约为-3.94%·℃^(-1)。温度变化引起钽酸锂表面电场发生变化,而石墨烯的载流子浓度及种类可随电场强度发生变化,从而导致其电阻随温度变化。石墨烯/钽酸锂材料体系可应用于热探测器领域。Graphene is a two-dimensional material with a hexagonal honeycomb lattice structure composed of carbon atoms periodically arranged.It has excellent optical,electrical,and mechanical properties.The conduction band and valence band of intrinsic graphene intersect in the Brillouin zone,which is a zero-band gap semiconductor material.Graphene has little effect on its resistance due to temperature,so it is difficult to be applied to temperature sensors.However,the atomic-scale thickness of the single to several layers of graphene and its adjustable energy band structure make it highly sensitive to the dielectric environment,which makes the graphene/dielectric material system sensitive to a variety of external physical quantities,so the band gap of graphene can be regulated by a variety of methods,among which the electric field control is the most common methods in order to regulate the resistance of graphene.Lithium tantalate(LiTaO_(3))is a material with trigonal distortion perovskite structure.Due to its non-centrosymmetric structure,it has good pyroelectric properties.The carrier concentration of graphene can be changed by the polarization of LiTaO_(3)when graphene is integrated on its surface,so it results in the resistance changing,thereby converting the thermal signal into an electric signal.For the graphene/pyroelectric material composite structure,the surface of the pyroelectric material is affected by the thermal field to produce a higher polarization electric field,which can effectively affect the carrier transport performance of graphene.Therefore,the graphene/LiTaO_(3)material system can be used as the key material for the thermal detector.The graphene/LiTaO_(3)material system had been studied in this paper.The influence of temperature on the system was theoretically explained and it also showed that the change of the graphene carrier concentration was proportional to the change of temperature in the system.Based on this property,a new type of the thermal detector was made by integrating graphene on the sur

关 键 词：石墨烯 石墨烯晶体管 钽酸锂 热释电 温度电阻系数(TCR) 

分 类 号：TN30[电子电信—物理电子学]