| 초록 |
The surface-mediated crystal structures of N,N′-ditridecylperylene-3,4,9,10-tetracarboxylic diimide (PTCDI-C13) and dinaphtho [2,3-b:2′,3′-f] thieno[3,2-b]thiophene (DNTT) on polymer/SiO2 bilayer dielectrics are investigated for organic field-effect transistors (OFETs) applications. The ordered structures of the PTCDI-C13 and DNTT films increases with increasing annealing temperature (TA), but the semiconductor–dielectric interfaces are also changed depending on the physical properties of the polymeric surfaces. When TA is increased above the glass transition temperature (Tg) of polymers, the physisorbed polymer layers become softened and further dewetted from the oxide surfaces, resulting in the subsidence of semiconducting crystal grains into the undulated polymer layers. In contrast, the polymer monolayer grafted to the SiO2 surface could maintain a wetting layer even at TA ＞ Tg. On the hydroxyl free surface, the organic semiconductors yield high-performance OFETs |
