Transport, optical and thermoelectrical properties of Cr and Fe disilicides and their alloys on Si(111)

被引:7
作者
Galkin, NG
Konchenko, AV
Vavanova, SV
Maslov, AM
Talanov, AO
机构
[1] Russian Acad Sci, Far Eastern Div, Inst Automat & Control Proc, Vladivostok 690041, Russia
[2] Far Eastern State Tech Univ, Vladivostok 690067, Russia
[3] Far Eastern State Univ, Vladivostok 690090, Russia
关键词
silicide; alloy; band structure; template; shunting effect;
D O I
10.1016/S0169-4332(01)00062-9
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
Transport, optical and thermopower properties of thin epitaxial CrSi2 and beta -FeSi2 films and their alloys (10-100 nm thick) on Si(1 1 1) p-type substrates have been investigated. Ex situ temperature Hall measurements of thin silicide films on Si(1 1 1) p-type substrate with 10 Omega cm resistivity have shown that only at room and low temperatures the shunting effect of the substrate can be accounted within the two-layer model of semiconductor layers connected in parallel. It has been shown that in beta -FeSi2 films. grown on Si(1 1 1)by template technology, the majority carriers are the electrons with high mobility. Template growth technology for alloy silicide films has been offered based on deposition of Cr and Fe with different deposition rates on hot silicon substrate. As-grown alloy films display semiconductor type optical absorption, but only Fe0.9Cr0.1Si2 film keeps the crystalline structure of beta -FeSi2. It has been shown that the iron disilicide, doped by chromium atoms, displays the semiconductor properties with direct band gap of about 0.6 eV. The majority carriers in the both alloy silicide films are holes from Hall effect and thermopower measurements. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:299 / 305
页数:7
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