Publication Date:
2015-08-28
Description:
The piezotronic effect uses strain-induced piezoelectric charges at interfaces and junctions to tune and/or control carrier transport in piezoelectric semiconductor devices. This effect has recently been observed in single-layer 2D MoS 2 materials. However, previous work had found that metallic states are generated at the edge of a free-standing MoS 2 flat sheet, and these states may screen the piezoelectric charges. Using density functional theory simulations, we found that the metal–MoS 2 interface structure plays an important role in enhancing both the piezoelectric and piezotronic effects in MoS 2 transistors by breaking the metallic state screening effect at the MoS 2 edge. This study not only provides an understanding of the piezoelectric and piezotronic effects based on first principles calculations but also offers guidance for the design of two-dimensional piezotronic devices.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics
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