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Electrical transport in passivated Pt/TiO2/Ti Schottky diodes

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5 Author(s)
Dittrich, Th. ; Hahn-Meitner-Institut, Glienicker Strasse 100, D-14109 Berlin, Germany ; Zinchuk, V. ; Skryshevskyy, V. ; Urban, I.
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Pt/TiO2/Ti Schottky diodes were investigated by current-voltage analysis, photoresponse, and transient photocurrent (PC) in a wide temperature range. The compact TiO2 as well as the SiO2 passivation layers were prepared by the sol-gel technique. The Schottky-barrier height (1.2–1.3 eV) was equal to the difference of the work functions of Pt and Ti. The temperature dependence of the ideality factor was interpreted in terms of a Gaussian distribution of barrier heights [J. H. Werner and H. H. Güttler, J. Appl. Phys. 69, 1522 (1991)]. Space-charge-limited currents under the presence of defects with an exponential distribution were observed. Under zero-potential condition, the PC transients were practically independent of temperature and the electron drift mobility amounted to 2×10-4 cm2/(V s). A screening dipole layer at the Pt/TiO2 junction was formed under low forward and reverse potentials. Defects were generated under electron injection.

Published in:

Journal of Applied Physics  (Volume:98 ,  Issue: 10 )

Date of Publication:

Nov 2005

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