Effects of substrate heating and biasing on nanostructural evolution of nonepitaxially grown TiN nanofilms.
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概要
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The effects of substrate heating and substrate biasing on the initial stage of nonepitaxial heterogeneous growth of TiN on Si(111) was studied by using high-resolution transmission electron microscopy. Although TiN films deposited at room temperature (RT) undergo a transition from continuous amorphous films to polycrystalline films with three-dimensional grains when the film thickness is increased from ~1 to 2 nm, crystallization occurred at a substrate temperature, T/sub s/=570 K, even for film thicknesses less than 1 nm. Compared with growth at T/sub s/=RT, at T/sub s/=570 K, the initial lateral grain size was only slightly larger, and the grains tended to be spherical and discontinuous at higher film thickness. At a substrate bias voltage, V/sub b/=-70 V, the grains were laterally larger and planar. At a film thickness of 50 nm, the films deposited at V/sub b/=-70 V showed the thermodynamically favored (200) preferred orientation, whereas the films deposited at T/sub s/=570 K showed (111) preferred orientation with a weak (200) peak.
- American Institute of Physicsの論文
著者
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Noda S
Univ. Tokyo Tokyo Jpn
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Komiyama H
Department Of Chemical System Engineering School Of Engineering University Of Tokyo
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