Since the {irst demonstration of organic photo voltaic devices much progress has been made. Organic solar cells reach now power conversion efficiencies of up to 3% over the solar spectrum. The morphology of the active film is very important for efficient devices. Films spin-coated from blend solutions phase separate. The scale of the phase separation depends on the solvent, solubility of the ma...

Polym. Adv g liquid processed polymer deposition method for the film preparation of functional polymers in photo-electronic devices. In this report, the results on the IJP of a fluorenebased electroluminescent polymer, poly(9,9-dihexylfluorene-alt-2,5-dioctyloxybenzene) (PF6OC8), from a piezoelectric droplet generator are presented. The polymer film thickness has been found to show an approxima...

Polyelectrolyte spin assembly (PSA) of multilayers is a sequential process featuring adsorption of oppositely charged polyelectrolytes from dilute solutions undergoing spin-coating flow. Here, we report on the dependence of PSA multilayer buildup of poly(sodium 4-styrenesulfonate) and poly(allylamine hydrochloride) on solution ionic strength and spin speed. We observed that at a given spin spee...

Both 2D and 3D colloidal particle “crystals” and patterned nanoparticle arrays deposited from colloidal suspensions are the subject of intense study owing to their potential applications in electronics, photonics, biological and chemical sensors, and catalysis. Colloidal particle crystals and patterned colloidal particles are most often formed using processes such as gravity sedimentation, spin...

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We study the spreading and fingering of drops of silicone oil on a rotating substrate for a range of rotation speeds and drop volumes. The spreading of the drop prior to the onset of fingering is found to follow the theoretically predicted time dependence, but with a large shift in time scale. For the full range of experimental parameters studied, the contact line becomes unstable and fingers d...

Spin-coating, one of Philips’ widespread wet-chemical coating technologies, is sensitive to substrate inhomogeneities. That leads sometimes to coating imperfections that are much larger than their causes. In order to understand how some of these imperfections affect the coating procedure, some experiments are going to be studied. In this case, a gravity-driven set-up will be used. The phenomeno...