期刊
NANO LETTERS
卷 16, 期 10, 页码 6383-6389出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b02788
关键词
MoS2; h-BN; substrate doping interface trap density; Coulomb scattering; Schottky barrier height; dipole alignment
类别
资金
- Institute for Basic Science [IBS-R011-D1]
- National Research Foundation of Korea (NRF) [2015069202]
- Ministry of Science, ICT & Future Planning, Republic of Korea
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS-R011-D1-2016-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Layered hexagonal boron nitride (h-BN) thin film is a dielectric that surpasses carrier mobility by reducing charge scattering with silicon oxide in diverse electronics formed with graphene and transition metal dichalcogenides. However, the h-BN effect on electron doping concentration and Schottky barrier is little known. Here, we report that use of h-BN thin film as a substrate for monolayer MoS2 can induce similar to 6.5 x 10(11) cm(-2) electron doping at room temperature which was determined using theoretical flat band model and interface trap density. The saturated excess electron concentration of MoS2 on h-BN was found to be similar to 5 x 10(13) cm(-2) at high temperature and was significantly reduced at low temperature. Further, the inserted h-BN enables us to reduce the Coulombic charge scattering in MoS2/h-BN and lower the effective Schottky barrier height by a factor of 3, which gives rise to four times enhanced the field-effect carrier mobility and an emergence of metal-insulator transition at a much lower charge density of similar to 1.0 x 10(12) cm(-2) (T = 25 K). The reduced effective Schottky barrier height in MoS2/h-BN is attributed to the decreased effective work function of MoS2 arisen from h-BN induced n-doping and the reduced effective metal work function due to dipole moments originated from fixed charges in SiO2.
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