Strain tolerance of two-dimensional crystal growth on curved surfaces
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science
- Nanjing Univ. of Aeronautics and Astronautics, Nanjing (China). College of Aerospace Engineering
- Rice Univ., Houston, TX (United States). Dept. of Materials Science and NanoEngineering
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science; Auburn Univ., Auburn, AL (United States). Dept. of Electrical and Computer Engineering
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Div.
Two-dimensional (2D) crystal growth over substrate features is fundamentally guided by the Gauss-Bonnet theorem which mandates that rigid, planar crystals cannot conform to surfaces with nonzero Gaussian curvature. Here we reveal how topographic curvature of lithographically-designed substrate features govern the strain and growth dynamics of triangular WS2 monolayer single crystals. Single crystals grow conformally without strain over deep trenches and other features with zero Gaussian curvature, however features with nonzero Gaussian curvature can easily impart sufficient strain to initiate grain boundaries and fractured growth in different directions. Within a strain tolerant regime, however, triangular single crystals can accommodate considerable (< 1.1%) localized strain exerted by surface features that shift the band gap up to 150 meV. Within this regime the crystal growth accelerates in specific directions, which we describe using a growth model. These results present a novel strategy to strain-engineer the growth directions and optoelectronic properties of 2D crystals.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1574020
- Alternate ID(s):
- OSTI ID: 1607203
- Journal Information:
- Science Advances, Vol. 5, Issue 5; ISSN 2375-2548
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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