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arXiv 1009.4512cond-mat.mtrl-sci
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Bi2Te3原子五元薄膜的热电性能

Thermoelectric properties of Bi2Te3 atomic quintuple thin films

Ferdows Zahid, Roger Lake

摘要:

激发最近的实验实现的五重原子层薄膜的Bi2Te3,热电优值,ZT,的五重层的计算和发现增加了10倍(ZT = 7.2)相比,在室温下的散装。ZT的大幅提高是由于薄膜中的量子限制引起的模式的价带密度分布的变化。理论模型采用从头计算电子结构计算(VASP)与充分的量子力学结构弛豫结合的线性响应传输系数的Landauer形式主义。

英文摘要:

Motivated by recent experimental realizations of quintuple atomic layer films of Bi2Te3,the thermoelectric figure of merit, ZT, of the quintuple layer is calculated and found to increase by a factor of 10 (ZT = 7.2) compared to that of the bulk at room temperature. The large enhancement in ZT results from the change in the distribution of the valence band density of modes brought about by the quantum confinement in the thin film. The theoretical model uses ab initio electronic structure calculations (VASP) with full quantum-mechanical structure relaxation combined with a Landauer formalism for the linear-response transport coefficients.

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