Barrier height and interface characteristics of Au/Mn 5Ge 3/Ge (111) Schottky contacts for spin injection

A. Sellai, A. Mesli, M. Petit, V. Le Thanh, D. Taylor, M. Henini

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Abstract

The interface states in Au/Mn 5Ge 3/Ge Schottky barrier diodes prepared for spintronic applications are investigated using dc I-V-T as well as ac admittance measurements. The latter were performed under forward and reverse biases over a wide range of frequencies (1 kHz3 MHz) while varying the temperature from 50 to 300 K. Variations of the ideality factor with temperature are related to the density of interface states, the presence of which is also evidenced as an excess capacitance in the capacitancefrequency characteristics as well as a peak in the conductance versus frequency. The temperature dependence of these interface state densities, determined to be of the range 10 1310 14eV 1cm 2, and their energy distribution with respect to the bottom of the conduction band are examined.

Original languageEnglish
Article number035014
JournalSemiconductor Science and Technology
Volume27
Issue number3
DOIs
Publication statusPublished - Mar 2012

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Condensed Matter Physics

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