Transparent and Flexible Graphene-based film as the replacement of Indium-Tin-OxideTechnology #10303n
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Transparent and Flexible Graphene-based film as the replacement of Indium-Tin-Oxide
This technology relates to graphene-based transparent conductors for replacement of Indium Tin Oxide (ITO).
Transparent conductors such as ITO pervade modern technology and consumer electronics. ITO is widely used in flat panel displays including touch screen panels. They also play a vital role in solar cell applications and organic light emitting diode devices. However, the rapid increase in indium demand and the limited supply of rare earth metals is making it an increasingly expensive material. Graphene, as the world’s thinnest material, provides not only a potentially cost effective alternative to ITO, but also combines seemingly mutually exclusive material properties, which are of great importance for the transparent conducting electrode market.
Prof. Barbaros Oezyilmaz’s group from the department of Physics has developed a graphene-based transparent conductor for replacement of Indium Tin Oxide (ITO). Currently, chemical doping is used to reduce the sheet resistance of graphene. However, this method has its drawbacks – i) mobility of graphene is decreased, ii) instability. For this technology, a new approach to solve these drawbacks in a single process based on a novel coating material of large-scale CVD graphene is proposed. The proposed technology will deliver ultra-low sheet resistance (good conductivity), high transparency and excellent mechanical flexibility.
Figure 1: High transmittance over a wide range of wavelength
Application and advantages
Potential application is as a transparent conductor, as a potential replacement for Indium-Tin-Oxide.
The advantages are:
- Ultra-low sheet resistance, ~10 Ω/ and high transparency, 95 – 97% transparency (in contrast, for ITO, a film with 80% transparency has a high sheet resistance of ~ 60 Ω/). Typically, a (thin) film with high transparency has a high sheet resistance.
- Excellent mechanical flexibility (> 100X more flexible than glass). In contrast, ITO is inflexible.
- Scalable synthesis method
Graphene, transparent, conductor, flexible, low sheet resistance
Patents granted in US, CN and SG
Prof. Barbaros Oezyilmaz: Barbaros@nus.edu.sg
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