New Technology InsightsSilver Nanowire Transparent Conducting Film

In sophisticated displays with a touch panel, such as foldable smartphones, a demand for decoration on each component is being increased.
A transparent conducting film is a main component of capacitive touch sensors mounted on displays. Innovative films having flexibility, low resistivity, and high transparency are being developed; one candidate for next-generation films is silver nanowire film (AgNW TCF).

What is AgNW TCF?

Currently, indium tin oxide (ITO) films are widely used as transparent conducting films, but they have low flexibility and bendability.

AgNW TCF offers excellent flexibility, excellent bendability, and low resistance compared with ITO films.

Using our original binder resin and overcoat material, we have further improved the bendability of AgNW TCF to overcome its disadvantage of low durability, while keeping its advantage of low resistivity.
Regarding bendability, AgNW TCF can withstand 1,000,000 mountain and valley folds (R = 1 mm), which is required by foldable smartphones.

Basic properties

Film structure

Protecting film Overcoat layer AgNW layer Base film Protecting film

Properties of our standard-grade AgNW TCF

Base filmMaterialCOPPC
Thickness[μm] 13 50 100
Electrical propertiesSheet resistance [Ω/□] 40 50 50
Optical propertiesTotal transmittance[%] 90 90 88
Haze[%] 0.8 0.8 1.0
b* 1.2 1.0 1.2

Data represents experimental results and does not guarantee specific performance levels under actual usage.

Flexibility

Using our original overcoat layer, our AgNW TCF has better bendability than the base film alone, which is the major determinant of bendability.

Folding testing machine(Tension-Free® Folding Clamshell-type)
YUASA SYSTEM CO., LTD. (https://www.yuasa-system.jp/test/s-cs/)
  Bending property
Radius of curvatureBending sideBending times
SDK-AgNW TCF
(Base film:COP/13µm)
R=1mm Valley Fold 1,000k*1
R=1mm Mountain Fold 1,000k*1
COP(13µm) R=1mm 230k*2

*1:No damage, *2:Crack

Data represents experimental results and does not guarantee specific performance levels under actual usage.

Electrical insulation reliability(High temperature and High humidity Bias Test)

Silver is generally known to be easily migrated; however, we have achieved high insulation reliability using our original binder resin.

Test sample Etching part(30μm)
  Short circuits
SDK AgNW TCF O.K. (0/4)
Other company's AgNW TCF N.G. (4/4)

Data represents experimental results and does not guarantee specific performance levels under actual usage.

HHBT results(85℃85%)
Data represents experimental results and does not guarantee specific performance levels under actual usage.