Résumé
This communication will display the use of novel organosilica materials embedding π-conjugated moieties1 as semiconductors into field effect transistors. The π-conjugated core chosen is [1]benzothieno[3,2-b][1]benzothiophene (BTBT), first functionalized with hydroxyl groups3 and then modified with hydrolysable and cross-linkable triethoxysilyl moieties. After polycondensation, this compound forms a hybrid material found to be a semiconductor. Taking advantage of the sol-gel chemistry involved here, we built Hybrid Field Effect Transistors that are fully cross-linked with covalent bonds. Molecules are cross-linked to each other, covalently bonded to the silicon oxide dielectric and also covalently bonded to the gold electrode thanks to the use of an appropriate surface modifier in between. This is the first report of fully covalent transistors4. Those devices with low mobility (10-5 cm2.V-1.s-1) show impressive resilience against polar, aliphatic and aromatics solvents (even under sonication). Our latest progress has enabled to better control the packing of molecules in Herringbone scheme, reaching now state-of-the-art mobility in the range of 0.1 to 1 cm2.V-1.s-1 but keeping their extraordinary robustness thanks to their hybrid crosslinked nature5.