Inversion-mode self-aligned In0.53Ga0.47 As N-channel metal-oxide-semiconductor field-effect transistor with HfAlO gate dielectric and TaN metal gate

Abstract

A high-performance In0.53Ga0.47As n-channel MOSFET integrated with a HfAlO gate dielectric and a TaN gate electrode was fabricated using a self-aligned process. After HCl cleaning and (NH4)2S treatment, the chemical vapor deposition HfAlO growth on In0.53Ga0.47As exhibits a high-quality interface. The fabricated nMOSFET with a HfAlO gate oxide thickness of 11.7 nm shows a gate leakage current density as low as 2.5 × 10-7A/cm2 at Vg of 1 V. Excellent inversion capacitance was illustrated. Silicon implantation was self-aligned to the gate, and low-temperature activation for source and drain was achieved by rapid thermal annealing at 600 °C for 1 min. The source and drain junction exhibited an excellent rectifying characteristic and high forward current. The result of an In0.53Ga0.47As nMOSFET shows well-performed Id-Vd and Id-Vg characteristics. The record high peak electron mobility of 1560 cm2Vs has been achieved without any correction methods considering interface charge and parasitic resistance. © 2008 IEEE.