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arXiv 0907.0448cond-mat.mes-hallcond-mat.mtrl-sci
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颗粒半导体的热电性能

Thermoelectric performance of granular semiconductors

Andreas Glatz, I. S. Beloborodov

摘要:

本文研究了晶粒间具有弱隧穿电导的半导体颗粒的热电性质,g_t < 1。我们计算的热电势和品质因数考虑到转移的化学势和费米表面附近的状态密度的不对称性,由于n-或p-型掺杂的Efros-Shklovskii制度的温度小于充电能量。我们发现,对于弱耦合半导体晶粒的品质因数是优化的典型材料的晶粒尺寸为5 nm的顺序,其值可以大于1。我们还研究了补偿颗粒半导体的情况下,并表明,在这种情况下,热电势仍然可以是有限的,虽然两到三个数量级小于在未补偿制度。

英文摘要:

We study thermoelectric properties of granular semiconductors with weak tunneling conductance between the grains, g_t < 1. We calculate the thermopower and figure of merit taking into account the shift of the chemical potential and the asymmetry of the density of states in the vicinity of the Fermi surface due to n- or p-type doping in the Efros-Shklovskii regime for temperatures less than the charging energy. We show that for weakly coupled semiconducting grains the figure of merit is optimized for grain sizes of order 5nm for typical materials and its values can be larger than one. We also study the case of compensated granular semiconductors and show that in this case the thermopower can be still finite, although two to three orders of magnitude smaller than in the uncompensated regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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