Journal
CHEMISTRY OF MATERIALS
Volume 23, Issue 18, Pages 4257-4263Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm2018423
Keywords
conjugated polymers; organic electronics; structure-property relationship; thin films; self-assembly
Funding
- Japan Science and Technology Agency (JST)
- Chinese Scholarship Council
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A regioregular poly(3-alkylthiophene) with alternating alkyl/semifluoroalkyl side chains (P3DDFT) spontaneously segregates on the surface of poly(3-dodecylthiophene) (P3DDT) during a spin-coating process and forms a thin fluoroalkyl layer with a thickness of less than 3 nm. This surface layer is as dense as fluoroalkyl-based self-assembled monolayers (SAMs) on metals, as demonstrated by angle-dependent X-ray photoelectron spectroscopy and water contact angle measurements. The semifluoroalkyl chains aligned at the air/solid interface form a large molecular dipole moment that continuously shifts the ionization energy by as much as +1.8 eV depending on the surface density of P3DDFT. This can be a novel approach to controlling the energy-level alignment at organic/(in)organic interfaces, analogous to the work function shifts of metals induced by the formation of SAMs.
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