TY - JOUR
T1 - Heat-Resistant Black Insulative Thin Films for Flat-Panel Displays in Al-Doped Ag-Fe-O Systems
AU - Yamaguchi, Mina
AU - Ishii, Akihiro
AU - Oikawa, Itaru
AU - Yamazaki, Yusuke
AU - Imura, Masaaki
AU - Takamura, Hitoshi
N1 - Funding Information:
This work was financially supported in part by JSPS (18H03832 and 21J12847). The authors would like to thank Dr. K. Kobayashi for taking the STEM images. They are grateful to N. Akao and Y. Ohira for technical support about the XPS measurement. M.Y. would like to express her appreciation for support from GP-MS at Tohoku University. The authors would like to thank Prof. Yuji Sutou for his useful input in understanding the microstructure.
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/12/8
Y1 - 2021/12/8
N2 - 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.
AB - 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.
KW - black insulators
KW - nanocermet materials
KW - optical coatings
KW - plasmonic materials
KW - pulsed laser deposition
KW - visible light absorbers
UR - http://www.scopus.com/inward/record.url?scp=85120610154&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85120610154&partnerID=8YFLogxK
U2 - 10.1021/acsami.1c17599
DO - 10.1021/acsami.1c17599
M3 - Article
AN - SCOPUS:85120610154
VL - 13
SP - 57971
EP - 57980
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 48
ER -