材料科学
二硫化钼
异质结
钼
退火(玻璃)
外延
碳化物
肖特基势垒
光电子学
纳米技术
化学工程
冶金
图层(电子)
二极管
工程类
作者
Jae Heung Jeon,Yereum Park,Sang‐Hoon Choi,Jinhee Lee,Sung Soo Lim,Byoung Hun Lee,Young Jae Song,Jeong Ho Cho,Yun Hee Jang,Sungjoo Lee
出处
期刊:ACS Nano
[American Chemical Society]
日期:2018-01-11
卷期号:12 (1): 338-346
被引量:150
标识
DOI:10.1021/acsnano.7b06417
摘要
The epitaxial synthesis of molybdenum carbide (Mo2C, a 2D MXene material) via chemical conversion of molybdenum disulfide (MoS2) with thermal annealing under CH4 and H2 is reported. The experimental results show that adjusting the thermal annealing period provides a fully converted metallic Mo2C from MoS2 and an atomically sharp metallic/semiconducting hybrid structure via partial conversion of the semiconducting 2D material. Mo2C/MoS2 hybrid junctions display a low contact resistance (1.2 kΩ·μm) and low Schottky barrier height (26 meV), indicating the material’s potential utility as a critical hybrid structural building block in future device applications. Density functional theory calculations are used to model the mechanisms by which Mo2C grows and forms a Mo2C/MoS2 hybrid structure. The results show that Mo2C conversion is initiated at the MoS2 edge and undergoes sequential hydrodesulfurization and carbide conversion steps, and an atomically sharp interface with MoS2 forms through epitaxial growth of Mo2C. This work provides the area-controllable synthesis of a manufacturable MXene from a transition metal dichalcogenide material and the formation of a metal/semiconductor junction structure. The present results will be of critical importance for future 2D heterojunction structures and functional device applications.
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