Impact of grain size on the Seebeck coefficient of bulk polycrystalline thermoelectric materials

• 来源期刊: 科学通报(英文版)
• 学科: 物理学
• 关键词: 晶粒尺寸 热电材料 材料系数 塞贝克系数 电子散射 平均自由程 粮食运输 输运方程
• 年，卷（期）: 2010,（1）
• 所属期刊栏目: ARTICLES
• 页码范围: 16-21
• 页数: 6页
• 分类号: O561.5 TB383
• 语种: 英文

摘要

Based on the Boltzmann transport equation of electrons and taking the scattering effect of electrons in the grain boundary as the boundary conditions of electrons transport in the grain, we presented a theoretical model for the Seebeck coefficient of bulk poly- crystalline thermoelectric materials, and applied it to studying the grain size effect on the Seebeck coefficient. Then we discussed the effects of transmissivity, temperature and the mean free path of electrons on the size effect. The results show t...