InAs Channel-Based Quantum Well Transistors for High-Speed and Low-Voltage Digital Applications

High-performance indium arsenic (InAs) channel-based quantum well field-effect transistors (QWFETs) have been fabricated. A superior drain–source current density of 1015 mA/mm was achieved, with a high transconductance of 1900 mS/mm when the drain was biased at 0.5 V. The current gain cutoff frequency and maximum oscillation frequency were extracted to be 393 and 260 GHz, respectively. A very low gate delay of 0.54 ps was also achieved at a 0.5 V drain bias. Compared to a silicon n-channel metal-oxide semiconductor field-effect transistor, the QWFETs exhibited a better radio-frequency performance with lower dc power consumption, which indicates the great potential for high-speed and low-voltage digital applications.