Heat-Resistant Black Insulative Thin Films for Flat-Panel Displays in Al-Doped Ag-Fe-O Systems

Mina Yamaguchi, Akihiro Ishii, Itaru Oikawa, Yusuke Yamazaki, Masaaki Imura, Hitoshi Takamura

Research output: Contribution to journalArticlepeer-review

Abstract

Multilayer antireflection (AR) coatings require a material with a large and constant absorption coefficient over the whole visible range and thermal stability. Coatings for use in touch panel displays are also required to be electrically insulative. In this study, 60 mol % Ag-40 mol % (Fe1-xAlx)-O (x = 0, 0.25, 0.50, 0.75, and 1.0) thin films are prepared by pulsed laser deposition, and their optical properties, electric resistance, and thermal stability are clarified by combining the experimental data and density functional theory (DFT) calculations. Over the visible range, large and constant absorption coefficients are obtained for all compositions. The standard deviations of the absorption coefficients of the x = 0.75 and 1.0 samples are found to be smaller than those of conventional materials like graphite and CrOx. High sheet resistance (Rsheet > 107 ω·sq-1) is also confirmed. It is determined that nanometer-sized Ag dispersed into a matrix, which was confirmed to be ionic Ag in the matrix phase, is responsible for the absorption at a shorter visible light range and insulative nature even at high Ag content. The films with high Al content are stable up to 500 °C. The potential of these black insulative Ag-Al-Fe-O thin films for use as black AR coatings is confirmed by optical simulations with multilayer stacks.

Original languageEnglish
Pages (from-to)57971-57980
Number of pages10
JournalACS Applied Materials and Interfaces
Volume13
Issue number48
DOIs
Publication statusPublished - 2021 Dec 8

Keywords

  • black insulators
  • nanocermet materials
  • optical coatings
  • plasmonic materials
  • pulsed laser deposition
  • visible light absorbers

ASJC Scopus subject areas

  • Materials Science(all)

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