红外与毫米波学报2023，Vol.42Issue(6)：743-747,5.DOI:10.11972/j.issn.1001-9014.2023.06.006
MoS2和MoTe2同质结和异质结中的表面电势排列
Surface potential alignment in MoS2 and MoTe2 homo-and hetero-junctions
摘要
Abstract
In transition metal dichalcogenides(TMD)flakes,the geometry,such as layer thickness,significant-ly tune the electronic properties,including bandgap,electron affinity and Fermi level.Such characteristic offers a high degree of freedom to tune the functionality of semiconductor device,once the volatile electronic properties are precisely determined.However,to date,there are still significant uncertainties in determining the Fermi-level alignment of TMD homo-or hetero-junctions,which might lead to significant deviations of band-bending and thus device performance.Here,we utilize the Scanning Kelvin Probe Microscopy(SKPM)to characterize the surface-potential/Fermi-level alignment of TMD homo-or hetero-junctions.Through this effort,a distinct phe-nomenon is verified where the Fermi-levels of MoS2 and MoTe2 shift towards the intrinsic level with an increasing layer thickness(in other words,the background doping concentration is continuously lowering).Moreover,we show the significant impact of surface contamination(molecular scale)on the surface potential of monolayer TMD.Finally,we fabricate a MoTe2/MoS2 heterojunction,in which we observe the wide depletion region and large photoresponse.Together,those findings might offer a reference to precisely stack van der Waals(vdW)lay-ers as designed for both electronic and optoelectronic applications.关键词
表面电势/过渡金属硫族化合物(TMD)/扫描开尔文探针显微镜(SKPM)/层厚Key words
surface potential/transition metal dichalcogenides(TMD)/Scanning Kevin Probe Microscopy(SKPM)/layer thickness分类
数理科学引用本文复制引用
江聪,张帅君,李玉莹,王文静,夏辉,李天信..MoS2和MoTe2同质结和异质结中的表面电势排列[J].红外与毫米波学报,2023,42(6):743-747,5.基金项目
Supported by the National Natural Science Foundation of China(11991063,62004207,61725505,62104118) （11991063,62004207,61725505,62104118）
the Shanghai Science and Technology Committee(2019SHZDZX01,19XD1404100,20YF1455900,20ZR1474000) （2019SHZDZX01,19XD1404100,20YF1455900,20ZR1474000）
the Strategic Priority Research Program of Chinese Acade-my of Sciences(XDB43010200) （XDB43010200）
the Youth Innovation Promotion Association CAS(2018276) （2018276）
