Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 46, Pages 39448-39454Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b15746
Keywords
dewetting; triphase contact line; in situ characterization; the Chinese brush; polymer films
Funding
- National Natural Science Foundation of China [21622302, 21872002, 21574005]
- Fundamental Research Funds for the Central Universities
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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 characterization triphase contact lines (TCLs) in a brush coating process, we clarify how TCLs affect the quality of as-prepared films. By finetuning the dewetting of a binary polymer solution (P3HT:PCBM) via different directions, TCLs with different patterns lead to films with different morphologies. High-quality nanothin films with larger crystallized sizes and higher orientations were enabled when TCLs were parallel to the brush edge, based on which the polymer solar cell shows higher power conversion efficiency (2.665%) compared with that of the spin-coated film.
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