Morphology, mechanical stability, and protective properties of ultrathin gallium oxide coatings
Artikel i vetenskaplig tidskrift, 2015

Ultrathin gallium oxide layers with a thickness of 2.8 ± 0.2 nm were transferred from the surface of liquid gallium onto solid substrates, including conjugated polymer poly(3-hexylthiophene) (P3HT). The gallium oxide exhibits high mechanical stability, withstanding normal pressures of up to 1 GPa in contact mode scanning force microscopy imaging. Moreover, it lowers the rate of photodegradation of P3HT by 4 orders of magnitude, as compared to uncovered P3HT. This allows us to estimate the upper limits for oxygen and water vapor transmission rates of 0.08 cm3 m-2 day-1 and 0.06 mg m-2 day-1, respectively. Hence, similar to other highly functional coatings such as graphene, ultrathin gallium oxide layers can be regarded as promising candidates for protective layers in flexible organic (opto-)electronics and photovoltaics because they offer permeation barrier functionalities in conjunction with high optical transparency.


F. Lawrenz

Universität Greifswald

P. Lange

Humboldt-Universität zu Berlin

N. Severin

Humboldt-Universität zu Berlin

J.P. Rabe

Humboldt-Universität zu Berlin

C. A. Helm

Universität Greifswald

Stephan Block

Chalmers, Teknisk fysik, Biologisk fysik


07437463 (ISSN) 15205827 (eISSN)

Vol. 31 21 5836-5842


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