Fabrication and DC current-voltage characteristics of real space transfer transistor with dual-quantum-well channel

We reported the standard ¿¿¿ shape negative differential resistance as well as a level and smooth valley region in real space transfer transistor (RSTT) with dual-quantum-well channel, which are formed by ¿-doping GaAs quantum-well and InGaAs/GaAs heterojunction quantum-well. The highest peak-to-valley current ratio (PVCR) of RSTT reaches 4 at room temperature. The highest peak current density transconductance (¿J_P/¿V_GS) is 130 ms/mm, which demonstrates the control ability of gate to J_P. The mechanism of obvious NDR of RSTT can be explained that the hot electron in the InGaAs U-shaped quantum-well channel transfers into V-shaped ¿-doping GaAs quantum-well channel, and the hot electron transfers into gate electrode from V-shaped ¿-doping GaAs quantum-well channel. This novel NDR device would be expected to applied in NDR circuits to instead of RTD+HEMT.