Ab initio description of the thermoelectric properties of heterostructures in the diffusive limit of transport

传输扩散极限下异质结构热电性质的从头计算

• 批准号: 120913074
• 负责人: Professor Dr. Arthur Ernst
• 金额: --
• 依托单位: Institut für Ionenstrahlphysik und Materialforschung
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/120913074?language=en
• 关键词: Ab; initio; description; thermoelectric; properties

The aim of the proposal is the ab initio description of the thermoelectric properties of nanosized materials in particular heterostructures. The investigations are based on density functional theory. The transport properties such as, electrical conductivity, thermopower and thermal conductivity are described in the diffusive limit of transport using the Boltzmann equation. That means, the mean free path is still short with respect to the characteristic length scale of the considered systems. The main idea is to study the influence of quantum size effects in the electronic and phonon properties in layered structures on the individual transport coefficient to optimize the figure of merit of the thermoelectric properties. The method will be applied to semiconductor and telluride heterostructures.

该提案的目的是从头计算描述的纳米材料，特别是异质结构的热电性能。研究是基于密度泛函理论。输运性质，如，电导率，热功率和热导率描述在扩散极限的运输使用玻尔兹曼方程。这意味着，相对于所考虑系统的特征长度尺度，平均自由程仍然很短。其主要思想是研究量子尺寸效应对层状结构中电子和声子性质的影响，以优化热电性能的优值。该方法将应用于半导体和碲化物异质结构。