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Evidence of shallow band gap in ultrathin 1T '-MoTe2 via infrared spectroscopy

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Title
Evidence of shallow band gap in ultrathin 1T '-MoTe2 via infrared spectroscopy
Author(s)
Jin Cheol Park; Eilho Jung; Sangyun Lee; Jungseek Hwang; Young Hee Lee
Subject
TRANSITION, ; OPPORTUNITIES, ; CONDUCTIVITY
Publication Date
2020-06
Journal
PHYSICAL REVIEW B, v.101, no.23, pp.235434
Publisher
AMER PHYSICAL SOC
Abstract
ⓒ2020 American Physical Society Although van der Waals (vdW) layered MoS2 shows the phase transformation from the semiconducting 2H phase to the metallic 1T phase through chemical lithium intercalation, vdW MoS2 is thermodynamically reversible between the 2H- and 1T' phases, and can be further transformed by energetics, laser irradiation, strain or pressure, and electrical doping. Here, thickness- and temperature-dependent optical properties of 1T'-MoTe2 thin films grown by chemical vapor depsition are investigated via Fourier-transformed infrared spectroscopy. An optical gap of 28 +/- 2 meV in a three-layer (or 2-nm)-thick 1T'-MoS2 is clearly observed at a low-temperature region below 50 K. No discernible optical band gap is observed in samples thicker than similar to 4 nm. The observed thickness-dependent band-gap results agree with the measured dc resistivity data; the thickness-dependent 1T'-MoTe2 clearly demonstrates the metal-semiconductor transition at a crossover below the 2-nm-thick sample
URI
https://pr.ibs.re.kr/handle/8788114/7812
DOI
10.1103/PhysRevB.101.235434
ISSN
2469-9950
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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