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Charge-transfer doped intrinsic diamond electrochemical electrodes

Published online by Cambridge University Press:  17 August 2011

Waileong Chen ,
Chiuan-Yi Li ,
Shoupu Yeh ,
Shin-Hung Yei  and
Yonhua Tzeng
Waileong Chen
Affiliation:
Institute of Microelectronics
Chiuan-Yi Li
Affiliation:
Institute of Nanotechnology and Microsystems Engineering, National Cheng Kung University No.1, University Road Tainan City 701, Taiwan (R.O.C.)
Shoupu Yeh
Affiliation:
Institute of Nanotechnology and Microsystems Engineering, National Cheng Kung University No.1, University Road Tainan City 701, Taiwan (R.O.C.)
Shin-Hung Yei
Affiliation:
Institute of Microelectronics
Yonhua Tzeng
Affiliation:
Institute of Microelectronics Institute of Nanotechnology and Microsystems Engineering, National Cheng Kung University No.1, University Road Tainan City 701, Taiwan (R.O.C.)
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Abstract

We report electrochemical characteristics of hydrogen terminated charge-transfer doped intrinsic microcrystalline diamond films. Microcrystalline diamond was synthesized by Direct- Current Plasma Enhanced Chemical Vapor Deposition (DC-PECVD) in methane diluted by hydrogen. The diamond films were subjected to further treatment by microwave plasma in pure hydrogen to increase the hydrogen termination of the diamond surfaces and their negative electron affinity. When the diamond is exposed to the ambient moisture, valance electrons tend to tunnel from the first few atomic layers of the diamond surface to the adsorbed water adlayer. This charge transfer process results in the surface of hydrogen-terminated diamond behaving like a p-type semiconductor.

Electrochemical characteristics of hydrogen-terminated diamond films were exposed to an air plasma for depleting the surface hydrogen atoms and then re-hydrogenated the same diamond films with atomic hydrogen. Cyclic voltammetry in 0.1M H2S04 aqueous solution and 0.01M Fe(CN)6-4/-3+0.1M KCl aqueous solution was applied to reveal high current density and wide potential window for hydrogen-terminated diamond grown on silicon substrates. The faceted surface morphology has been observed by SEM. The crystalline characteristics and carbon phases in the diamond film were examined by Raman spectroscopy.

Keywords

diamondhydrogenationchemical vapor deposition (CVD) (deposition)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1362: Symposium QQ – Carbon Functional Interfaces , 2011 , mrss11-1362-qq09-51
Copyright
Copyright © Materials Research Society 2011

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