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Large Area Fabrication of Periodic TiO2 Nanopillars Using Microsphere Photolithography on a Photopatternable Sol-Gel Film.

Authors
  • Shavdina, O
  • Berthod, L
  • Kämpfe, T
  • Reynaud, S
  • Veillas, C
  • Verrier, I
  • Langlet, M
  • Vocanson, F
  • Fugier, P
  • Jourlin, Y
  • Dellea, O
Type
Published Article
Journal
Langmuir
Publisher
American Chemical Society
Publication Date
Jul 21, 2015
Volume
31
Issue
28
Pages
7877–7884
Identifiers
DOI: 10.1021/acs.langmuir.5b01191
PMID: 26102428
Source
Medline
License
Unknown

Abstract

The authors demonstrate a unique low cost process to print 2D, submicron size, and high refractive index nanopillars using a direct colloidal-photolithography process. A well collimated i-line source emitting at 365 nm wavelength illuminates a mono layer of silica microspheres of 1 μm diameter deposited on a photosensitive TiO2-based sol-gel layer. No etching process is needed since this layer is directly UV photo patternable like a negative photoresist. Furthermore, this thin layer offers interesting optical properties (high refractive index and optical transparency) and good mechanical and chemical stability and thus can be directly used as a functional microstructure (for PV or sensor applications, for example). The paper describes the modeling of the electric field distribution below the spheres during the illumination process, the photochemistry of the TiO2 sol-gel layer process, and preliminary results of TiO2 nanopillars of around 200 nm in diameter fabricated on a three-inch substrate.

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