A Pseudomorphic In0.53Ga0.47As/AlAs Resonant Tunneling Barrier with a Peak-to-Valley Current Ratio of 14 at Room Temperature

Abstract
We have studied the effect of barrier height on the negative differential resistance characteristics of In0.53Ga0.47As-based resonant tunneling barriers (RTBs), including In0.53Ga0.47As/(In0.52Al0.48As) x (In0.53Ga0.47As)1-x RTBs, lattice-matched to an InP substrate, and In0.53Ga0.47As/AlAs pseudomorphic RTBs also grown on InP substrates. A peak-to-valley current ratio of 14 (300 K) and 35 (77 K) with a high peak-current density of 2.3×104A/cm2 was achieved for a resonant tunneling barrier structure of In0.53Ga0.47As (15 atomic layers)/AlAs (9 atomic layers).