Spatial distribution of two-dimensional electron gas in a ZnO/ Mg0.2 Zn0.8 O heterostructure probed with a conducting polymer Schottky contact

M. Nakano, A. Tsukazaki, K. Ueno, R. Y. Gunji, A. Ohtomo, T. Fukumura, M. Kawasaki

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15 Citations (Scopus)

Abstract

A ZnO/ Mg0.2 Zn0.8 O heterostructure was characterized at T=2 K through capacitance measurements with using a conducting polymer, poly(3,4- ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS), as a Schottky contact. The Nyquist diagram, which is the trajectory curve of the complex impedance vector, appeared to be an excellent semicircular shape, implying that the PEDOT:PSS/ZnO/ Mg0.2 Zn0.8 O junction can be described with an equivalent single RC parallel circuit. Capacitance-voltage characteristics elucidate the existence of a two-dimensional electron gas, where 1019 cm-3 electrons are confined within 5 nm at the ZnO/ Mg0.2 Zn0.8 O heterointerface.

Original languageEnglish
Article number052116
JournalApplied Physics Letters
Volume96
Issue number5
DOIs
Publication statusPublished - 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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