Ab initio study of field emission from hydrogen defects in diamond subsurfaces

被引：6

作者：

Araidai, M

Watanabe, K

机构：

[1] Tokyo Univ Sci, Fac Sci, Dept Phys, Shinjuku Ku, Tokyo 1628601, Japan

[2] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

来源：

APPLIED SURFACE SCIENCE | 2004年 / 237卷 / 1-4期

关键词：

field emission; hydrogen defects; diamond subsurface; band structures; time-dependent density-functional theory;

D O I：

10.1016/j.apsusc.2004.07.029

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The field-emission (FE) of diamond surfaces with hydrogen defects in the subsurface is investigated by time-dependent density-functional theory calculation. It is found that FE currents from diamond surface with hydrogen atoms in the subsurface region are significantly enhanced because the defect levels induced by the hydrogen atoms in the energy band gap have small ionization energy. The shapes of energy distribution of FE current density vary largely depending on the type of hydrogen defects. The present results suggest that high emission current from diamond surfaces at low electric fields observed in experiments is ascribed to hydrogen defects in diamond subsurfaces. (C) 2004 Elsevier B.V. All rights reserved.

引用

收藏

页码：482 / 487

页数：6

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