Abstract
In this letter, bilayer phosphorene and its corresponding nanoribbons are utilized as pressure sensors due to their ${E}_{g}$ modulation mechanism under normal compressive strain. A multiscale simulation flow is implemented from the band structure to the current calculations. To obtain exact tight binding (TB) Hamiltonians and the following current results, unitary Wannier transformations are adopted, and interactions between the four nearest TB neighbors are considered. From the simulations, the sensitivity of the bilayer phosphorene pressure sensor was found to increase exponentially as the pressure increased due to the ${E}_{g}$ modulation mechanism. The sensitivity of zigzag bilayer phosphorene nanoribbons (zBPNRs) was further improved. At low pressures, the improvements are mainly derived from the restriction of the flat region. The sensitivities of zBPNRs reached ${4.2} \times {10}^{{8}}$ KPa $^{-{1}}$ under a pressure of approximately 2.5 GPa, which indicates their potential application in pressure sensor arrays.
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