Effect of pentacene–dielectric affinity on pentacene thin film growth morphology in organic field-effect transistors

Improving the performance of organic thin film transistors formed on a vacuum flash-evaporated acrylate insulator

“…Of course, the transistor performance is likely to be dominated by the pentacene order very close to the dielectric surface, which may be very different from the bulk and free-surface morphology, as suggested by the "layer þ island" crystal growth mode for the first few layers of pentacene. 16,17,19 In Table I and Fig. 3(a), we present the charge carrier mobility of OTFTs with different dielectric surface buffers and bare TPGDA.…”

Kelvin probe microscopic visualization of charge storage at polystyrene interfaces with pentacene and gold

“…This is consistent with charging occurring in the PS away from the interface. This interface should resemble vertical device interfaces, 10 in that any pentacene molecules on the edge of the PS should be oriented with the long axis normal to that edge, 14 regardless of its exact orientation.…”

Hydrophobic dielectric surface influenced active layer thickness effect on hysteresis and mobility degradation in organic field effect transistors

“…As mentioned before, it has been discussed in the literature that nucleation density and grain size of organic semiconductors depend mainly on the surface energy conditions of the dielectric surface [9,15,16]. As molecular ordering is reported to improve due to the increased moleculeemolecule interaction of organic semiconductors on hydrophobic surfaces, it is essential to determine the optimum thickness of the active layer on such hydrophobic dielectrics and to understand the influence of the hydrophobic dielectrics in deciding the optimum thickness to obtain higher mobility and threshold voltage stability.…”

“…Additionally, high density of interchain cross linking of alkyl chain molecules ensure smoothening of dielectric surface roughness which in turn improves molecular ordering. Use of self assembled monolayers also have the advantage in tuning of the dielectric surface energy by using alkyl chain molecules with suitable functional groups [9,10]. SAMs with CH 3 end groups convert hydrophilic dielectric surface to highly hydrophobic in nature enabling strong moleculeemolecule interaction and thus improving molecular ordering significantly [8,11].…”