Journal
NANO RESEARCH
Volume 8, Issue 12, Pages 3796-3802Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-015-0878-8
Keywords
piezoelectricity; two-dimensional (2D) material; monochalcogenide; density functional theory (DFT) calculation
Categories
Funding
- National Science Foundation [DMR-1410636]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1410636] Funding Source: National Science Foundation
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It is found that several layer-phase group-III monochalcogenides, including GaS, GaSe, and InSe, are piezoelectric in their monolayer form. First-principles calculations reveal that the piezoelectric coefficients of monolayer GaS, GaSe, and InSe (2.06, 2.30, and 1.46 pm center dot V-(TM) 1) are of the same order of magnitude as previously discovered two-dimensional (2D) piezoelectric materials such as boron nitride (BN) and MoS2 monolayers. This study therefore indicates that a strong piezoelectric response can be obtained in a wide range of two-dimensional materials with broken inversion symmetry. The co-existence of piezoelectricity and superior photo-sensitivity in these monochalcogenide monolayer semiconductors means they have the potential to allow for the integration of electromechanical and optical sensors on the same material platform.
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