中国物理B ›› 2016, Vol. 25 ›› Issue (6): 67304-067304.doi: 10.1088/1674-1056/25/6/067304
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
Dakhlaoui H, Almansour S
Dakhlaoui H, Almansour S
摘要:
In this work, the electronic properties of resonant tunneling diodes (RTDs) based on GaN-AlxGa(1-x)N double barriers are investigated by using the non-equilibrium Green functions formalism (NEG). These materials each present a wide conduction band discontinuity and a strong internal piezoelectric field, which greatly affect the electronic transport properties. The electronic density, the transmission coefficient, and the current-voltage characteristics are computed with considering the spontaneous and piezoelectric polarizations. The influence of the quantum size on the transmission coefficient is analyzed by varying GaN quantum well thickness, AlxGa(1-x)N width, and the aluminum concentration xAl. The results show that the transmission coefficient more strongly depends on the thickness of the quantum well than the barrier; it exhibits a series of resonant peaks and valleys as the quantum well width increases. In addition, it is found that the negative differential resistance (NDR) in the current--voltage (I-V) characteristic strongly depends on aluminum concentration xAl. It is shown that the peak-to-valley ratio (PVR) increases with xAl value decreasing. These findings open the door for developing vertical transport nitrides-based ISB devices such as THz lasers and detectors.
中图分类号: (III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)