In-situ characterizing the tri-phase contact line in a brushing-coating process: towards the enhanced efficiency of polymer solar cells.
ACS applied materials & interfaces(2018)
Abstract
Solution processes have been widely used for making polymer films in organic photoelectric devices, but suffer from difficulties in controlling the film formation. Here, by in-situ characterizing tri-phase contact lines (TCLs) in a brush-coating process, we clarify how TCLs affect the quality of as-prepared films. By fine tuning the dewetting of a binary polymer solution (P3HT:PCBM) via different directions, TCLs with different patterns lead to films with different morphologies. High quality nano-thin films with larger crystallized size and higher orientation were enabled when TCLs parallel to the brush edge, based on which a polymer solar cell shows higher power conversion efficiency (2.665%) comparing with that of the spin-coated film.
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Key words
dewetting,triphase contact line,in situ characterization,the Chinese brush,polymer films
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