Sabin-Lucian Suraru

Room #: 406

Phone: +49 931 31-88155

suraru@chemie.uni-wuerzburg.de

Weblink to curriculum vitae and full publication list

Research:

The development of organic thin film transistors (TFTs) has emerged to a great field of research, strongly connected to the finding of new powerful organic semiconductor materials. The finding of n-type materials with high efficiencies, as well as operating stability under ambient conditions, is a great challenge. The latter might be achieved by designing molecules with low-lying LUMO-levels, or by forming a kinetic barrier to the diffusion of ambient oxidants due to the self-segregation of fluorocarbon chains. These presumptions lead us to the synthesis of new core-chlorinated NDIs with fluorinated chains at the imide position. These compounds show n-type behavior with outstanding field-effect mobilities of up to 1.3 cm² V^‑1 s^-1 and on/off ratios of 10⁷. A novel naphthalene diimide with a fully conjugated, extended p-core was synthesized in a one-pot, two-step reaction. This organic semiconductor exhibits ambipolar transport properties with a large hole mobility of 0.56 cm² V^‑1 s^-1 and a current on/off ratio of 10⁶ in bottom-gate, top-contact thin-film transistors prepared by vacuum deposition. Furthermore the discovery of a new diketopyrrolopyrrole (DPP) derivative as an efficient p-type material opens up new perspectives for target molecules as high performance organic semiconductors.

Selected publications:

1.  S.-L. Suraru, U. Zschieschang, H. Klauk, F. Würthner
    A core-extended naphthalene diimide as a p-channel semiconductor
    Chem. Commun. 2011, 47, 11504–11506
2. S.-L. Suraru, U. Zschieschang, H. Klauk, F. Würthner
   Diketopyrrolopyrrole as a p-channel organic semiconductor for high performance OTFTs.
   Chem. Commun. 2011, 47, 1767–1769
3. J. H. Oh, S.-L. Suraru, W.-Y. Lee, M. Könemann, H. W. Höffken, C. Röger, R. Schmidt, Y. Chung,
   W.-C. Chen, F. Würthner, Z. Bao
   High-Performance Air-Stable n-Type Organic Transistors Based on Core-Chlorinated Naphthalene Tetracarboxylic Diimides.
   Adv. Funct. Mater. 2010, 20, 2148–2156