Regular ZnO nanopillar arrays by nanosphere photolithography

Szabó, Z. and Volk, János and Gergely-Fülöp, Eszter and Deák, András and Bársony, István (2012) Regular ZnO nanopillar arrays by nanosphere photolithography. PHOTONICS AND NANOSTRUCTURES, 11. pp. 1-7. ISSN 1569-4410

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Abstract

Highly regular vertical ZnO nanopillar arrays were hydrothermally grown through a nucleation window pattern generated by nanosphere photolithography. The in-plane intensity modulation of the exposing ultraviolet light in the photoresist was performed by Sto¨ber silica or polystyrene nanospheres in the masking Langmuir–Blodgett monolayer. By comparing six different nanosphere diameters in the 180–700 nm range only those with diameter above the exposure wavelength of 405 nm generate a pattern in the thin photoresist layer. The pattern quality is improving with increasing diameter, therefore, the masking for nanopillar growth was demonstrated with 700 nm polystyrene nanospheres. The results of the nanosphere photolithography were supported by finitedifference time-domain calculations. This growth approach was shown to have the potential for low-cost, low-temperature, large area fabrication of ZnO pillars or nanowires enabling a precise engineering of geometry. # 2012 Elsevier B.V. All rights reserved.

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