The optical properties of ultra-thin films fabricated by layer-by-layer adsorption process depending on dipping time

Shiro Fujita, Seimei Shiratori

Research output: Contribution to journalConference article

15 Citations (Scopus)


The layer-by-layer (LBL) self-assembled polyelectrolytes adsorption process is a very slow process. For the fabrication of low-cost application, fabrication time must be decreased. In this work, we measured optical properties of poly(acrylic acid) (PAA)/poly(allylamine hydrochloride) (PAH) thin films depending on deposition time and added impurities. As dipping time was short from 900 s to 180 s, thickness was almost the same. The reason for this was that adsorption quantity was almost the same between 900 s and 180 s from frequency shift of the quartz crystal microbalance measurement. When dipping time was 900 s and 180 s, the refractive index dispersion curves were different before HCl treatment. However, the refractive index dispersion curves were almost the same after HCl treatment. The total fabrication time of the anti-reflection (AR) film decreased from about 6 h (dipping time 900 s) to 2 h (dipping time 180 s), three times faster. Luminous reflection of the film decreased from 0.5 to 0.2, performing 2.5 times better. We propose a high-performance AR film fabrication method for LBL process by the optimization of the film thickness.

Original languageEnglish
Pages (from-to)54-60
Number of pages7
JournalThin Solid Films
Issue number1-2
Publication statusPublished - 2006 Mar 21
EventProceedings of the Sixth International Conference on Nano-Molecular Electronics (ICNME 2004) -
Duration: 2004 Dec 152004 Dec 17



  • Anti-reflection film
  • Layer-by-layer
  • Microporous
  • Polyelectrolyte

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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