The electronic transport and photoelectric properties of hydrogenated borophene ${\mathrm{B}}_4{\mathrm{H}}_4$, which were realized in a recent experiment by Nishino, et al. [J. Am. Chem. Soc. 139, 13761 (2017)] are systematically investigated using the density functional theory and nonequilibrium Green's function methods. We find that ${\mathrm{B}}_4{\mathrm{H}}_4$ exhibits a perfect current-limiting effect and has high (along the zigzag direction) and low (along the armchair one) optional levels due to its strong electrical anisotropy. Moreover, ${\mathrm{B}}_4{\mathrm{H}}_4$ can generate sizable photocurrents under illumination, with strong photoelectronic response to blue or green light along the zigzag or armchair direction. Our work demonstrates that ${\mathrm{B}}_4{\mathrm{H}}_4$ is promising for the applications of current limiter and photodetectors.

• Received 14 January 2019
• Revised 18 March 2019

DOI:https://doi.org/10.1103/PhysRevApplied.11.064031