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Thermopower, Electrical and Hall Conductivity of Undoped and Doped Iron Disilicide Single Crystals

Published online by Cambridge University Press:  15 February 2011

A. Heinrich ,
G. Behr ,
H. Griessmann ,
S. Teichert  and
H. Lange
A. Heinrich
Affiliation:
Institut für Festkörper- und Werkstofforschung Dresden, Helmholtzstr.20, D-01069 Dresden, Germany
G. Behr
Affiliation:
Institut für Festkörper- und Werkstofforschung Dresden, Helmholtzstr.20, D-01069 Dresden, Germany
H. Griessmann
Affiliation:
Institut für Festkörper- und Werkstofforschung Dresden, Helmholtzstr.20, D-01069 Dresden, Germany
S. Teichert
Affiliation:
Technische Universität Chemnitz-Zwickau, Institut für Physik, D-09107 Chemnitz, Germany
H. Lange
Affiliation:
Hahn-Meitner Institut Berlin GmbH, Abt. Photovoltaik, Rudower Chaussee 6, D-12489 Berlin, Germany
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Abstract

The electrical transport properties of β-FeSi2 single crystals have been investigated in dependence on the purity of the source material and on doping with 3d transition metals. The transport properties included are electrical conducticvity, Hall conductivity and thermopower mainly in the temperature range from 4K to 300K. The single crystals have been prepared by chemical transport reaction in a closed system with iodine as transport agent. In undoped single crystals prepared with 5N Fe both electrical conductivity and thermopower depend on the composition within the homogeinity range of β-FeSi2 which is explained by different intrinsic defects at the Sirich and Fe-rich phase boundaries. In both undoped and doped single crystals impurity band conduction is observed at low temperatures but above 100K extrinsic behaviour determined by shallow impurity states. The thermopower shows between 100K and 200K a significant phonon drag contribution which depends on intrinsic defects and additional doping. The Hall resistivity is considered mainly with respect to an anomalous contribution found in p-type and n-type single crystals and thin films. In addition doped single crystals show at temperatures below about 130K an hysteresis of the Hall voltage. These results make former mobility data uncertain. Comparison will be made between the transport properties of single crystals and polycrystalline material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 478: Symposium Q – Thermoelectric Materials - New Directions and Approaches , 1997 , 255
Copyright
Copyright © Materials Research Society 1997

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