Ab initio electronic transport study of two-dimensional......
Two-dimensional silicon carbide (2d-SiC) is a viable material for next generation electronics due to its moderate, direct bandgap with huge potential. In particular, its potential for p-n junctions is yet to be explored. In this paper, three types of 2d-SiC-based p-n junctions with different doping configuration are modeled. The doping configurations refer to partially replacing carbon with boron or nitrogen atoms along the zigzag or armchair direction, respectively. By employing density functional theory, we calculate the transport properties of the SiC based p-n junctions and obtain negative differential resistance and high rectification ratio. We also find that the junction along the zigzag direction with lower doping density exhibits optimized rectification performance. Our study suggests that 2d-SiC is a promising candidate as a material platform for future nano-devices.
Cite this article：Hanming Zhou, Xiao Lin, Hongwei Guo, Shisheng Lin, Yiwei Sun and Yang Xu. Ab initio electronic transport study of two-dimensional silicon carbide-based p-n junctions. Journal of Semiconductors, 2017, 38(3): 033002
Fig. 5. (a) The electron density distribution of PN-Zlow at zero bias voltage with atomic charge unit (e/Å3). (b) The induced electron density of PN-Zlow at various bias voltages. The density plane corresponds to one unit cell, where V is the volume of the unit cell. The zero-bias electron density is subtracted.