Articles you may be interested inThickness modulation effects of Al2O3 capping layers on device performance for the top-gate thin-film transistors using solution-processed poly(4-vinyl phenol)/Zn-Sn-O gate stacks
We have investigated effect of polymer on solution-processed organic thin-film transistors (TFTs) with polymer-blend semiconductors. Organic TFTs made from a solution of 6,13-bis(triisopropylsilylethynyl)-pentacene with a poly(-methylstyrene) (PaMS) molecular weight of 20 k or above, exhibited mobility around 0.1 cm 2 /(VÁs). On the other hand, the organic TFTs with a PaMS molecular weight of 2 k or with a poly(isobutyl methacrylate), exhibited much lower mobility. This can be explained in terms of the structure and crystallinity of the films. The results of film structure can be explained by applying the Flory-Huggins theory.
The surface morphology and preferential orientation of μc-Si:H has been studied on c-Si substrate in relation to the Si-H bonding mode. Epitaxy-like growth is observed on Si (001) substrate at a moderate temperature and under low ion bombardment, while the surface is significantly roughened. With increasing or decreasing the temperature or increasing the ion bombardment, the lattice orientation is randomized and an amorphous component is increased, resulting in the reduction of the surface roughness. The growth mode is intimately related to the Si-H bonding configuration. The epitaxy-like growth is collapsed accompanying the disappearance of the surface Si-H 2,3 mode. The resemblance of these phenomena to the low temperature MBE is discussed.
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