Probing the Optical Properties and Strain-Tuning of Ultrathin Mo1–xWxTe2

Aslan, Ozgur Burak; Datye, Isha M.; Mleczko, Michal J.; Cheung, Karen Sze; Krylyuk, Sergiy; Bruma, Alina; Kalish, Irina; Davydov, Albert V.; Pop, Eric; Heinz, Tony F.

doi:10.1021/acs.nanolett.8b00049

Probing the Optical Properties and Strain-Tuning of Ultrathin Mo_1–xW_xTe₂

Journal Article · Wed Mar 21 00:00:00 EDT 2018 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.8b00049· OSTI ID:1457055

^[1]; Datye, Isha M. ^[2]; Mleczko, Michal J. ^[2]; Cheung, Karen Sze ^[2]; Krylyuk, Sergiy ^[3]; Bruma, Alina ^[4]; ^[4]; Davydov, Albert V. ^[4]; ^[2]; ^[1]

Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Stanford Univ., Stanford, CA (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Theiss Research, La Jolla, CA (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)

Ultrathin transition metal dichalcogenides (TMDCs) have recently been extensively investigated to understand their electronic and optical properties. Here we study ultrathin Mo_0.91W_0.09Te₂, a semiconducting alloy of MoTe₂, using Raman, photoluminescence (PL), and optical absorption spectroscopy. Mo_0.91W_0.09Te₂ transitions from an indirect to a direct optical band gap in the limit of monolayer thickness, exhibiting an optical gap of 1.10 eV, very close to its MoTe₂ counterpart. We apply tensile strain, for the first time, to monolayer MoTe₂ and Mo_0.91W_0.09Te₂ to tune the band structure of these materials; we observe that their optical band gaps decrease by 70 meV at 2.3% uniaxial strain. The spectral widths of the PL peaks decrease with increasing strain, which we attribute to weaker exciton–phonon intervalley scattering. Furthermore, strained MoTe₂ and Mo_0.91W_0.09Te₂ extend the range of band gaps of TMDC monolayers further into the near-infrared, an important attribute for potential applications in optoelectronics.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1457055

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 4 Vol. 18; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
MoTe2
MoWTe2
alloyed 2D materials
band gap
photoluminescence
strain engineering