Palladium forms Ohmic contact on hydrogen-terminated diamond down to 4 K

Abstract

A hydrogen-terminated diamond (H-terminated diamond) surface supports a two-dimensional (2D) p-type surface conductivity when exposed to the atmosphere, as a result of the surface transfer doping process. The formation of reliable Ohmic contacts that persist to cryogenic temperature is essential for the exploration of quantum transport in the diamond 2D conducting channel. Herein, the contact properties of Pd on H-terminated diamond have been fully investigated down to 4 K using transmission line method measurements. Pd is shown to form an Ohmic contact on H-terminated diamond with linear I-V characteristics and low specific contact resistance in the range of (8.4 ± 1) ×10-4 ω·cm2 to (1.3 ± ..