GAP STATES, DOPING AND BONDING IN TETRAHEDRAL AMORPHOUS-CARBON

被引:41
作者
AMARATUNGA, GAJ [1 ]
ROBERTSON, J [1 ]
VEERASAMY, VS [1 ]
MILNE, WI [1 ]
MCKENZIE, DR [1 ]
机构
[1] UNIV SYDNEY,SCH PHYS,SYDNEY,NSW 2006,AUSTRALIA
关键词
AMORPHOUS CARBON; BONDING; ELECTRON PARAMAGNETIC RESONANCE; SEMICONDUCTOR;
D O I
10.1016/0925-9635(94)05295-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Highly tetrahedral amorphous carbon (ta-C) formed by energetic C ion deposition is shown to have a relatively low density of defect gap states. This allows ta-C to be doped and show photoconductivity, even though unhydrogenated. The spin density is measured as a function of ion energy and is found to decrease with increasing sp(3) bonding from a value of 10(20) cm(-3) to 6 x 10(18) Cm-3. The low defect density of ta-C, despite the presence of 10-40% of sp(2) sites, arises from the ability of sp(2) sites to pair up and form rr bonds, whose states lie outside the gap.
引用
收藏
页码:637 / 640
页数:4
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