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High-Resolution Scanning Near-Field Optical Lithography of Conjugated Polymers

Credgington, D. ; Fenwick, O. ; Charas, A. ; Morgado, J. ; Suhling, K. ; Cacialli, F.

Advanced Functional Materials Vol. 20, Nº 17, pp. 2842 - 2847, September, 2010.

ISSN (print): 1616-301X
ISSN (online):

Scimago Journal Ranking: 4,77 (in 2010)

Digital Object Identifier: 10.1002/adfm.201000202

The fabrication of high-resolution nanostructures in both poly( p -phenylene vinylene), PPV, and a crosslinkable derivative of poly(9,9 ′ -dioctylfluorene), F8, using scanning near-fi eld optical lithography, is reported. The ability to draw complex, reproducible structures with 65000 pixels and lateral resolution below 60 nm ( < λ /5) is demonstrated over areas up to 20 μ m × 20 μ m. Patterning on length-scales of this order is desirable for realizing applications both in organic nanoelectronics and nanophotonics. The technique is based on the site-selective insolubilization of a precursor polymer under exposure to the confi ned optical fi eld present at the tip of an apertured near-fi eld optical fiber probe. In the case of PPV, a leaving-group reaction is utilized to achieve insolubilization, whereas the polyfl uorene is insolubilized using a photoacid initiator to create a crosslinked network in situ. For PPV, resolubilization of the features is observed at high exposure energies. This is not seen for the crosslinked F8derivative, r-F8Ox, allowing us to pattern structures up to 200 nm in height.