Special Features of Thermoelectric Phenomena in Granulated Semiconductors

摘要

A model of the heterogeneous semiconductor medium consisting of multiphase granules, which are the crystal semiconductor grains covered by the oxide film has been proposed. The effective medium model (EMM) of the set of contacting granules has been constructed. Each granule phase is characterised by its own conductivity σi, heat conductivity xi, Seebeck factor αi, characteristic size d_i and, accordingly, efficiency of thermoelectric transformation Z_i. Expressions for the estimation of σ_9eff) ,x_(eff),α_(eff)and Z_(eff) are constructed, and their values depending on asymmetry degree of characteristics of the granule components are analysed. The complicated ternary thermoelectric media is considered. The possibilities of acquisition of the optimal medium characteristics under various technological conditions and the action of ionizing radiation have been studied.