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Interfacial width in polymer bilayer films prepared by double-spin-coating and flotation methods.

Yoshihisa Fujii¹, Hironori Atarashi, Masahiro Hino

¹Department of Applied Chemistry, Kyushu University, Fukuoka 819-0395, Japan, and Research Reactor Institute, Kyoto University, Osaka 590-0494, Japan.

ACS Applied Materials & Interfaces

|April 2, 2010

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Spin-coating organic devices may not be as precise as assumed. Solvents can invade structures, widening interfaces more than expected, impacting device fabrication. This finding is crucial for multilayer construction.

Area of Science:

Materials Science
Polymer Science
Surface Science

Background:

Multilayer structures are key for organic electronics.
Spin-coating is a common fabrication method, assuming solvent non-invasion.
The validity of this assumption needs experimental verification.

Purpose of the Study:

To investigate solvent invasion during spin-coating of polymer bilayers.
To quantify the interfacial width (lambda(i)) using different fabrication methods.
To assess the impact of spin-coating on multilayer integrity.

Main Methods:

Fabrication of model polymer bilayers using spin-coating and flotation.
Utilizing neutron reflectivity measurements to determine interfacial width.
Employing polystyrene and perdeuterated poly(methyl methacrylate) as model polymers.

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Main Results:

Interfacial width (lambda(i)) was significantly larger for spin-coated bilayers compared to flotation-prepared bilayers.
Neutron reflectivity confirmed increased interfacial mixing in spin-coated samples.
The assumption of non-invading solvents in spin-coating is challenged.

Conclusions:

Spin-coating processes may lead to greater interfacial diffusion than previously assumed.
The observed interfacial widening impacts the precise construction of multilayer organic devices.
Careful consideration of solvent-structure interactions is necessary for reliable multilayer fabrication.