What They Say
Queen Mary University of London (which must have re-branded from Queen Mary College) working with Paragraf (Cambridge, UK) and Tokyo, Japan, have collaborated in a research project that used a monolayer graphene anode to replace ITO in an OLED. The paper shows ‘identical’ performance to ITO when used in touch systems. The graphene was fabricated onto a sapphire substrate without any metal catalyst using a commercial MOCVD system. Optical transmittance of the graphene layer was >97%.
The sheet resistance of the as-grown single layer graphene (SLG) is 2290 ± 105 ? sq–1, measured over a distance of 7 mm. This value is typical for graphene deposited on sapphire, and is higher than for unsupported exfoliated graphene due to a strong electron–phonon interaction between the graphene and the sapphire. However, after doping the SLG with HNO3 vapor the sheet resistance is reduced to 450 ± 47 ? sq–1, again measured over a distance of 7 mm.
What We Think
Hmmm, this is an interesting development. One of the challenges of ITO is that it is not very flexible. Graphene is quite flexibible although I didn’t spot any comments about this aspect in a quick look at the paper. (BR)
