TIPS-DBC small molecule O-FETs fabricated by evaporation and solution processing

The performance of organic field effect transistors using the small molecule, tri-isopropyl- silane-di-benzo chrysene (TIPS-DBC) is reported. The field effect mobility _FE is found to depend on the deposition conditions, which affect the morphology of the film. A mobility in the range of 1.5×10 ^-6 to 2.4×10 ^-4cm ²V ^-1s ^-1 is obtained from the evaporated films depending on the substrate treatment and deposition temperature, while films deposited by solution-processing techniques yield mobilities in the range of 0.7×10 ^-3 to 1.5×10 ^-3cm ²V ^-1s ^-1. The enhanced performance in polycrystalline solution-processed coatings and its relationship to crystallite size is an important parameter in the design of high-performance devices based on small molecules.