Strain engineering photonic properties in monolayer semiconductors through mechanically-reconfigurable wrinkling

M. A. Hossain, Yue Zhang, Arend M. Van Der Zande

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Inhomogeneous and three-dimensional strain engineering in two dimensional materials opens up new avenues to straintronic devices for control strain sensitive photonic properties. Here we present a method to tune strain by wrinkling monolayer WSe2 attached to a 15 nm thick ALD support layer and compressing the heterostructure on a soft substrate. The ALD film stiffens the 2D material, enabling optically resolvable micron scale wrinkling rather than nanometer scale crumpling and folding. Using photoluminescence spectroscopy, we show the wrinkling introduces periodic modulation of the bandgap by 47 meV, corresponding with strain modulation from +0.67% tensile strain at the wrinkle crest to -0.31% compressive strain at the trough. Moreover, we show that cycling the substrate strain mechanically reconfigures the magnitude and direction of wrinkling and resulting band tuning. These results pave the way towards stretchable multifuctional devices based on strained 2D materials.

Original languageEnglish (US)
Title of host publicationPhysical Chemistry of Semiconductor Materials and Interfaces XIX
EditorsChristian Nielsen, Daniel Congreve, Andrew J. Musser
PublisherSPIE
ISBN (Electronic)9781510637344
DOIs
StatePublished - 2020
EventPhysical Chemistry of Semiconductor Materials and Interfaces XIX 2020 - Virtual, Online, United States
Duration: Aug 24 2020Sep 4 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11464
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferencePhysical Chemistry of Semiconductor Materials and Interfaces XIX 2020
CountryUnited States
CityVirtual, Online
Period8/24/209/4/20

Keywords

  • 2D materials
  • Nanomechanics
  • Strain Engineering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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