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

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 (MoS)/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 O cycling test and a low-frequency noise spectroscopy, the graphite on top of the MoS 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.

A Synergistic Approach to Unraveling the Thermodynamic Stability of Binary and Ternary Chevrel Phase Sulfides

“…Microwave irradiationcoupled with a graphitic microwave susceptor , facilitated rapid conversion of incident radiation into thermal energy where temperatures were maintained at ∼1273 K for 10 min for each metal-intercalated CP. In order to obtain binary Mo 6 S 8 , wet chemical etching was employed according to methods discussed by Lancry et al where Cu 2 Mo 6 S 8 was stirred overnight in a 6 M HCl solution with O 2 bubbling …”