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Thin-film transistors


​VTT offers materials testing as well as process, device, circuit and demonstrator development for large-area active semiconductor electronics such as printed thin-film-transistor (TFT) and diode-based solutions. The majority of applications in the growing large-area-electronics market need TFTs distributed over a large area, due to which the usage of silicon-based IC solutions can be far from the optimum solution. Such applications include display backplanes, sensor arrays, wearable sensors / computing and smart packages. Join with VTT in developing large area electronics products.

In collaboration between Nokia and VTT, a printed flexible sensor array with a TFT backplane was reported at the LOPEC 2015 conference in March 2015. The sensor data was read from the array to a cell phone over an NFC interface.

In the Points EU FP7 project, together with Stora Enso, VTT demonstrated a functional card at the LOPEC 2014 conference. The card included a TFT-based flip-flop circuit to control LEDs.

VTT develops printed thin-film transistor technologies based on organic materials, carbon nanotubes and metal-oxide materials. Key focuses are in materials development and testing, process development for sheet-to-sheet and roll-to-roll printing as well as in device and circuit development. VTT can collaborate with clients at all levels of the development from materials testing to demonstrators. VTT is also partnering and coordinating a number EU projects for TFT developments. Recent research focuses have included lowering the curing temperature of oxide semiconductors (J. Leppäniemi et al., App. Phys. Lett. 105, 113514, 2014) and fully R2R printed OTFTs (Vilkman et al., Organic Electronics 20, 8 – 14, 2015).