The majority of applications in the growing large-area-electronics market need both passive and active components including transistors distributed over a large area. In such applications, including display backplanes, sensor arrays, wearable sensors / computing and smart packages, the optimal solution is mostly not based on silicon integrated circuits.
Join with VTT in developing large area electronics products. VTT offers materials testing, development 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 unique infrastructure of VTT allows the full development path from the lab-scale to the pilot-scale.
VTT develops printed thin-film transistor technologies based on organic materials, carbon nanotubes, layered materials and metal-oxide materials. Key focus is in materials development, characterization and testing, process development for high-resolution sheet-to-sheet and high-throughput 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 participating and coordinating a number of EU projects for TFT developments as well as Academy of Finland projects. Through the active international collaboration in printed TFT development, VTT has a wide network that can be utilized to gather the best group and approach for solving challenges in different flexible TFT applications.
Recent research focus on printed thin-film transistors at VTT have included
- High-resolution reverse-offset-printed oxide semiconductors in
J. Leppäniemi et al., Adv. Electron. Mater. 2019, 5, 8, 1900272
- Providing printed contacts to oxide semiconductors in
L. Gillan et al., J. Mater. Chem. C, 2018, 6, 3220
- Lowering the curing temperature of inkjet-printed oxide semiconductors in
J. Leppäniemi et al., ACS Appl. Mater. Interfaces, 2017, 9, 10, 8774
- Using roll-to-roll-compatible flexographic printing as the fabrication method for oxide TFTs in
J. Leppäniemi et al., Adv. Mater. 2015, 27, 7168.
- Flexible electronics based on printing of layered materials such as graphene or MoS2 for RFID and transistor/sensor applications (several papers published and in progress)
- Fully roll-to-roll processed of OTFTs with printed etchants in
M. Vilkman et al., Organic Electronics, 2015, 20, 8
- All-printed OTFTs on substrates prepared from cellulose nanofibres in
T. Hassinen et al., MRS Advances, 2015, 1, 10, 645
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.