High electrical conductivity in out of plane direction of electrodeposited Bi2Te3 films

Miguel Muñoz Rojo, Cristina V. Manzano, Daniel Granados, M. R. Osorio, Theodorian Borca-Tasciuc, Marisol Martín-González

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Abstract

The out of plane electrical conductivity of highly anisotropic Bi2Te3 films grown via electro-deposition process was determined using four probe current-voltage measurements performed on 4.6 - 7.2 μm thickness Bi2Te3 mesa structures with 80 - 120 μm diameters sandwiched between metallic film electrodes. A three-dimensional finite element model was used to predict the electric field distribution in the measured structures and take into account the non-uniform distribution of the current in the electrodes in the vicinity of the probes. The finite-element modeling shows that significant errors could arise in the measured film electrical conductivity if simpler one-dimensional models are employed. A high electrical conductivity of (3.2 ± 0.4) · 105 S/m is reported along the out of plane direction for Bi2Te3 films highly oriented in the [1 1 0] direction.

Original languageEnglish
Article number087142
JournalAIP advances
Volume5
Issue number8
DOIs
Publication statusPublished - 1 Aug 2015
Externally publishedYes

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