By using vertical current transport and thin organic layers, these devices allow for low operation voltages and high current densities without the need for active structuring. First devices exhibiting a transmission of 99% and an amplification of over 1000 have been realized.

First very interesting results on new materials for OFETs have been shown by the Voit group. In next steps, mobility characterization experiments will be performed and first transistors with these new materials will be built by the Leo group.

Details of very important achievements of the group are listed below:

• Synthesis of new, all-conjugated block copolymers, first time by Kumada coupling; oxy-gen-stable; publication in preparation;
• Synthesis of monomer for high-mobility polymers (6g), first successful polymerization;
• Synthesis of various polymers as gate dielectrics; studied in device structures, joint publication in preparation;
• Synthesis of high refractive index polymers, studied in OLED systems, one publication submitted, joint publication in preparation;
• Synthesis of new liquid-crystalline dielectrics as gate dielectric, study of dielectric and breakthrough properties, joint publication in preparation.

The group of Prof. Ellinger realized the first fully printed organic amplifier within the matching fund project FLEXIBILITY in cooperation with Organic Path. They demonstrated a TFT operational amplifier on plastic with 23 dB gain and only 160 µW dc power within the matching fund project FLEXIBILITY in cooperation with Organic Path. They realized a compact TFT model developed within the matching fund project FLEXIBILITY in cooperation with Organic Path. They demonstrated a 2.62 MHz 762 µW Cascode Amplifier in Flexible a-IGZO Thin-Film Technology for Textile and Wearable-Electronics Applications within the matching fund project FLEXIBILITY in cooperation with Organic Path. The group successfully cooperates with Prof. Fischer (Polymer technology and devices) and Prof. Hübler (printing technologies).

New dopants for OLEDs have been synthetized by the group of F. Moresco and characterized on the Au(111) surface by scanning tunneling microscopy and spectroscopy to determine their adsorption properties and their electronic structure.

Note:

• Publication in Nature Communications: ‘Doped Organic Transistors: Inversion and Depletion Regime’, by B. Lüssem, K. Leo et al.
• Best Poster prize was awarded to Tim Erdmann at ISSON13 - 7th International Summer School on Nanosciences & Nanotechnologies (Thessaloniki, Greece, 6.-13. July 2013) for the poster: The first chain-growth polymerization of a dithienosilole monomer and new all-conjugated block copolymers for plastic electronics
• R. Brückner was awarded the Goldberg-Prize for an outstanding dissertation (Robert-Luther-Foundation, TU Dresden, 2014)