Journal article

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

Kaijian Xing, Alexander Tsai, Sergey Rubanov, Daniel L Creedon, Steve A Yianni, Lei Zhang, Wei-Chang Hao, Jincheng Zhuang, Jeffrey C McCallum, Christopher I Pakes, Dong-Chen Qi

APPLIED PHYSICS LETTERS | AMER INST PHYSICS | Published : 2020

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 ± ..

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Grants

Awarded by Australian Research Council


Funding Acknowledgements

This work was supported by the Australian Research Council under the Discovery Project (No. DP150101673). D.Q. acknowledges the support of the Australian Research Council (Grant No. FT160100207) and the continuous support from the Queensland University of Technology (QUT) through the Centre for Materials Science.