High-speed enhancement-mode InP MISFET´s grown by chloride vapor-phase epitaxy

The properties of enhancement-mode InP metal-insulator-semiconductor field-effect transistors fabricated on semi-insulating InP substrates are reported. The epitaxial layers of the device structure have been grown by chloride vapor-phase epitaxy. Short-circuit current gain cutoff frequencies of 29.6 GHz were measured for 1-μm-gate-length devices. For devices with submicrometer gate lengths, extrinsic transconductance values up to 300 mS/mm and short-circuit current-gain cutoff frequencies of 38.1 GHz were measured. SiO₂ deposited by electron beam evaporation and plasma-enhanced CVD Si₃N₄ have been utilized as gate insulators, and a drain current drift of 30% within the first 50 h of operation has been observed. The high-speed performance of these devices represent to the authors´ knowledge the fastest InP-based MIS field-effect transistor demonstrated