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Preparation and properties of hybrid bilayer structures based on organic Alq3, ferromagnetic La[sub]2/3[/sub]Sr[sub]1/3[/sub]MnO[sub]3[/sub] and Fe[sub]3[/sub]O[sub]4[/sub]
Author(s): B. Vengalis; K. Šliužienė; I. Černiukė; R. Butkutė; V. Lisauskas; A. Maneikis
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Paper Abstract

We report preparation and properties of hybrid bilayer structures composed of the organic semiconductor, 8-hydroxyquinoline aluminum (Alq3), p-type Si and two ferromagnetic oxides, namely, colossal magnetoresistance manganite, La2/3Sr1/3MnO3 (LSMO), and magnetite (Fe3O4). Thin Alq3 films were thermally evaporated in vacuum. The bottom LSMO films were grown in-situ at 750°C by dc magnetron sputtering on crystalline SrTiO3 while Fe3O4 films were magnetron sputtered at 400°C on glass. Current versus voltage in a case of vertical current flow has been investigated for the heterojunctions. The investigations revealed dominating role of thermoionic emission in a barrier of Schottky type for the Alq3/p-Si heterojunction while a mechanism based on carrier tunnelling through an interface and space charge limited current processes were considered to explain nonlinear electrical transport in the Alq3/LSMO, Alq3/ Fe3O4 heterojunctions. The Alq3/LSMO demonstrated magnetoresistance values up to 11 % (at T=240 K and B=1 T).

Paper Details

Date Published: 2 December 2008
PDF: 6 pages
Proc. SPIE 7142, Sixth International Conference on Advanced Optical Materials and Devices (AOMD-6), 71420V (2 December 2008); doi: 10.1117/12.815942
Show Author Affiliations
B. Vengalis, Semiconductor Physics Institute (Lithuania)
K. Šliužienė, Semiconductor Physics Institute (Lithuania)
I. Černiukė, Semiconductor Physics Institute (Lithuania)
R. Butkutė, Semiconductor Physics Institute (Lithuania)
V. Lisauskas, Semiconductor Physics Institute (Lithuania)
A. Maneikis, Semiconductor Physics Institute (Lithuania)

Published in SPIE Proceedings Vol. 7142:
Sixth International Conference on Advanced Optical Materials and Devices (AOMD-6)
Janis Spigulis; Andris Krumins; Donats Millers; Andris Sternberg; Inta Muzikante; Andris Ozols; Maris Ozolinsh, Editor(s)

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