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THERMAL CHARATERIZATIN OF SILICON NANOWIRES

机译:硅纳米粒子的热甲壳素

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摘要

When crystalline solids are confined to the nanometer range, phonon transport within them can be significantly altered due to various effects, namely (ⅰ) increased boundary scattering; (ⅱ) changes in phonon dispersion relation; and (ⅲ) quantization of phonon transport. For example, theoretical studies (e.g., Chung et al., 2000) have suggested that, as the diameter of a silicon nanowire (NW) becomes smaller than 20 nm, the phonon dispersion relation, and therefore its density of states, could be modified due to phonon confinement. This in turn impacts the phonon group velocities and scattering rates that can further reduce the thermal conductivity of confined structures.
机译:当结晶固体被限制在纳米范围内时,由于各种影响,它们中的声子传输会发生显着变化,即(ⅰ)增加边界散射; (ⅱ)声子色散关系的变化; (ⅲ)声子传输的量化。例如,理论研究(例如Chung等人,2000年)建议,随着硅纳米线(NW)的直径变得小于20 nm,声子的色散关系及其状态密度可以改变。由于声子禁闭。反过来,这会影响声子基团的速度和散射速率,从而进一步降低受限结构的热导率。

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