TY - JOUR
T1 - Spatial distribution of two-dimensional electron gas in a ZnO/ Mg0.2 Zn0.8 O heterostructure probed with a conducting polymer Schottky contact
AU - Nakano, M.
AU - Tsukazaki, A.
AU - Ueno, K.
AU - Gunji, R. Y.
AU - Ohtomo, A.
AU - Fukumura, T.
AU - Kawasaki, M.
N1 - Funding Information:
The work is partly supported by the Asahi Glass Foundation and Global COE program.
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
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U2 - 10.1063/1.3309699
DO - 10.1063/1.3309699
M3 - Article
AN - SCOPUS:76449091084
VL - 96
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 5
M1 - 052116
ER -