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Mechanisms of current flow in metal-semiconductor ohmic contacts

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Abstract

Published data on the properties of metal-semiconductor ohmic contacts and mechanisms of current flow in these contacts (thermionic emission, field emission, thermal-field emission, and also current flow through metal shunts) are reviewed. Theoretical dependences of the resistance of an ohmic contact on temperature and the charge-carrier concentration in a semiconductor were compared with experimental data on ohmic contacts to II–VI semiconductors (ZnSe, ZnO), III–V semiconductors (GaN, AlN, InN, GaAs, GaP, InP), Group IV semiconductors (SiC, diamond), and alloys of these semiconductors. In ohmic contacts based on lightly doped semiconductors, the main mechanism of current flow is thermionic emission with the metal-semiconductor potential barrier height equal to 0.1–0.2 eV. In ohmic contacts based on heavily doped semiconductors, the current flow is effected owing to the field emission, while the metal-semiconductor potential barrier height is equal to 0.3–0.5 eV. In alloyed In contacts to GaP and GaN, a mechanism of current flow that is not characteristic of Schottky diodes (current flow through metal shunts formed by deposition of metal atoms onto dislocations or other imperfections in semiconductors) is observed.

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  1. Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia

    T. V. Blank & Yu. A. Gol’dberg

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  1. T. V. Blank
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  2. Yu. A. Gol’dberg
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Original Russian Text © T.V. Blank, Yu.A. Gol’dberg, 2007, published in Fizika i Tekhnika Poluprovodnikov, 2007, Vol. 41, No. 11, pp. 1281–1308.

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Blank, T.V., Gol’dberg, Y.A. Mechanisms of current flow in metal-semiconductor ohmic contacts. Semiconductors 41, 1263–1292 (2007). https://doi.org/10.1134/S1063782607110012

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