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Flexible Nanoscale Organic Thin-Film Transistors

Gemeinsames Kolloquium des Fachbereichs Physik und des SFB 1083

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Abstract:

Organic thin-film transistors (TFTs) are field-effect transistors in which the semiconductor is a thin layer of conjugated organic molecules. Unlike transistors based on inorganic semiconductors (such as silicon or zinc oxide), organic TFTs can often be fabricated at process temperatures no higher than about 100 degrees Celsius and thus on a wide range of unconventional substrates, including plastics, textiles and paper. This makes organic TFTs potentially useful for flexible electronics applications, such as foldable or rollable displays or conformable sensor arrays. An important performance parameter of transistors in general (and of organic TFTs in particular) is the transit frequency, which is the highest frequency at which the transistors are able to switch or amplify electrical signals. A field-effect transistor’s transit frequency depends critically on the channel length and the parasitic gate-to-contact overlaps. Since organic TFTs often have channel lengths and overlaps of several microns or even tens of microns, their transit frequencies are usually no higher than a few megahertz. To explore the performance of organic TFTs with aggressively scaled dimensions, we have used electron-beam lithography and fabricated organic TFTs with channel lengths and overlaps as small as 100 nm on flexible plastic substrates.