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Issue 3, 2015

Black phosphorus nanoelectromechanical resonators vibrating at very high frequencies

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Abstract

We report on the experimental demonstration of a new type of nanoelectromechanical resonator based on black phosphorus crystals. Facilitated by a highly efficient dry transfer technique, crystalline black phosphorus flakes are harnessed to enable drumhead resonators vibrating at high and very high frequencies (HF and VHF bands, up to ∼100 MHz). We investigate the resonant vibrational responses from the black phosphorus crystals by devising both electrical and optical excitation schemes, in addition to measuring the undriven thermomechanical motions in these suspended nanostructures. Flakes with thicknesses from ∼200 nm down to ∼20 nm clearly exhibit elastic characteristics transitioning from the plate to the membrane regime. Both frequency- and time-domain measurements of the nanomechanical resonances show that very thin black phosphorus crystals hold interesting potential for moveable and vibratory devices and for semiconductor transducers where high-speed mechanical motions could be coupled to the attractive electronic and optoelectronic properties of black phosphorus.

Graphical abstract: Black phosphorus nanoelectromechanical resonators vibrating at very high frequencies

Supplementary files

Article information


Submitted
21 Aug 2014
Accepted
12 Oct 2014
First published
13 Oct 2014

Nanoscale, 2015,7, 877-884
Article type
Communication

Black phosphorus nanoelectromechanical resonators vibrating at very high frequencies

Z. Wang, H. Jia, X. Zheng, R. Yang, Z. Wang, G. J. Ye, X. H. Chen, J. Shan and P. X.-L. Feng, Nanoscale, 2015, 7, 877 DOI: 10.1039/C4NR04829F

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