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Influence of the chemical potential on the carrier effective mass in the thermoelectric solid solution Cu_2Zn_(1-x)Fe_xGeSe_4

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Abstract

In this paper, we describe the synthesis and characterization of the solid solution Cu_2Zn_(1-x)Fe_xGeSe_4. Electronic transport data have been analyzed using a single parabolic band model and have been compared to Cu_(2+x)Zn_(1-x)GeSe_4. The effective mass of these undoped, intrinsically hole conducting materials increases linearly with increasing carrier concentration, showing a non-parabolic transport behavior within the valence band.

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