Regensburg 2013 – scientific programme
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DS: Fachverband Dünne Schichten
DS 11: Poster Session I: Application of thin films; Ion beam induced surface patterns; Ion and electron beam induced processes; Micro- and nanopatterning (jointly with O)
DS 11.23: Poster
Monday, March 11, 2013, 17:00–20:00, Poster B1
Continuous wave UV-laser sintering of ink-jet printed ZnO nanoparticle thin films at low laser powers — •Alice Sandmann1, Jens Theis2, Axel Lorke2, Christian Notthoff1, and Markus Winterer1 — 1Nanoparticle Process Technology and CeNIDE, Universität Duisburg-Essen, Lotharstr.1, 47057 Duisburg, Germany — 2Fachbereich Physik and CeNIDE, Universität Duisburg-Essen, Lotharstr.1, 47057 Duisburg, Germany
We present continuous wave UV-laser sintering experiments of ZnO nanoparticle thin films prepared by ink-jet printing. The ZnO nanoparticles are printed on interdigital gold structures on quartz substrates and characterized by conductivity and microphotoluminescence measurements. The microstructure of the nanoparticle thin films is obtained by scanning electron microscopy. We show that laser sintering can be observed even at laser powers as low as 30 mW, using an UV-laser at 325 nm focused to a 10 µm spot. Furthermore, we describe the laser heating process numerically using an iterative finite element algorithm, which couples the heat equation with a simplified sintering model. The numerical and experimental results match well and reveal two key parameters responsible for the effective heating and sintering process: The laser wavelength in relation to the wavelength corresponding to the band gap of the material and the initial porosity of the film.