Electrothermal Local Annealing via Graphite Joule Heating on Two-Dimensional Layered Transistors

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Title
Electrothermal Local Annealing via Graphite Joule Heating on Two-Dimensional Layered Transistors
Author(s)
Yoojoo Yun; Jeongmin Park; Hyun Kim; Jung Jun Bae; Min-Kyu Joo; Dongseok Suh
Publication Date
2018-08
Journal
ACS APPLIED MATERIALS & INTERFACES, v.10, no.30, pp.25638 - 25643
Publisher
AMER CHEMICAL SOC
Abstract
A simple but powerful device platform for electrothermal local annealing (ELA) via graphite Joule heating on the surface of transition-metal dichalcogenide, is suggested here to sustainably restore intrinsic electrical properties of atomically thin layered materials. Such two-dimensional materials are easily deteriorated by undesirable surface/interface adsorbates and are screened by a high metal-to-semiconductor contact resistance. The proposed ELA allows one to expect a better electrical performance such as an excess electron doping, an enhanced carrier mobility, and a reduced surface traps in a monolayer molybdenum disulfide (MoS2)/graphite heterostructure. The thermal distribution of local heating measured by an infrared thermal microscope and estimated by a finite element calculation shows that the annealing temperature reaches up to >400 K at ambient condition and the high efficiency of site-specific annealing is demonstrated unlike the case of conventional global thermal annealing. This ELA platform can be further promoted as a practical gas sensor application. From an O2 cycling test and a low-frequency noise spectroscopy, the graphite on top of the MoS2 continuously recovers its initial condition from surface adsorbates. This ELA technique significantly improves the stability and reliability of its gas sensing capability, which can be expanded in various nanoscale device applications. Copyright © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/5532
ISSN
1944-8244
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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