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Graphene: When a Crystal Goes Flexible

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If you have a question about this talk, please contact Aleksandr Sahakyan.

Flexible electronics is an ever-expanding research area. Applications include touch screens, electronic paper, sensors, photovoltaic cells and electronic textiles. Printing is the most promising technique for cheap large-area flexible electronics and is now well-established to manufacture thin-film transistors (TFTs) based on organic semiconducting inks. For instance, in displays, TFTs are currently made of poly-silicon or, more recently, of Indium Gallium Zinc Oxide (IGZO). However, IGZO is expensive, due to Indium scarcity and both poly-silicon and IGZO are neither printable nor fully-flexible (i.e. flexible in three dimensions). On the other hand, the electron mobility of semiconducting inks is still much lower than standard poly-silicon technology, making the actual printable electronics prototypes extremely slow.

After the isolation of Graphene in Manchester in 2004 and the 2010 Nobel Prize in Physics to Andre Geim and Kostya Novoselov, graphene came at the centre of an ever expanding research area. Near-ballistic transport and high mobility make it an ideal material for nanoelectronics, especially for high frequency applications. Furthermore, its optical and mechanical properties are ideal for thin-film transistors and transparent and conductive electrodes. Here I will show how the extraordinary properties of graphene can be used to fabricate graphene-based printable, transparent and conductive electrodes and TFTs for flexible electronics.

This talk is part of the Darwin College Science Seminars series.

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