Phonon drag of electrons at high temperatures

TL;DR

This paper investigates the phonon drag effect on electrons at high temperatures in semiconductors with electron-vibrational centers, suggesting an extension of existing theory beyond low temperatures.

Contribution

It proposes expanding the phonon drag of electrons theory to high temperatures in the presence of strong electron-phonon coupling due to electron-vibrational centers.

Findings

Observation of narrow peaks at Debye temperatures in TEP.

Existence of pius at substrate phonon Debye temperatures.

Need to extend PDE theory to high temperatures with strong electron-phonon coupling.

Abstract

Temperature-dependent thermoelectric power (TEP) in semiconductor crystals and crystal structures containing an electron-vibrational centers (EVC) was investigated in this article. The TEP contain narrow pius at Debye temperatures for different phonons. In thin epitaxial layers on substrates such pius exist at Debye temperatures of substrates phonons. These pius existence imposable to explain on basis of known TEP theory but it may be explained by the phonon drag of electrons (PDE) effect. In this connection there is the necessity to change traditional point of view on the PDE effect existence only at low temperatures and expand the PDE theory on case of strong electron-phonon coupling provided by EVC at high temperatures.