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Directed phase separation of PFO:PS blends during spin-coating using feedback controlled in situ stroboscopic fluorescence microscopy

Directed phase separation during spin-coating is used in the production of organic electronics and has potential to take lithographic techniques beyond the optical resolution limit. This paper describes the use of real-time information to directly determine the composition fluctuations and therefore control the phase separation during spin-coating. This approach, utilising a fluorescent polymer allows for the image intensity to be mapped to composition. The techniques can be applied to many other systems, therefore, will facilitate a deeper understanding of phase separation in general. This work has the potential for far reaching impact for both device processing and fundamental polymer physics.