CUED Publications database

Hierarchical orientation of crystallinity by block-copolymer patterning and alignment in an electric field

Goldberg-Oppenheimer, P and Kabra, D and Vignolini, S and Hüttner, S and Sommer, M and Neumann, K and Thelakkat, M and Steiner, U (2013) Hierarchical orientation of crystallinity by block-copolymer patterning and alignment in an electric field. Chemistry of Materials, 25. pp. 1063-1070. ISSN 0897-4756

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Abstract

Electron and hole conducting 10-nm-wide polymer morphologies hold great promise for organic electro-optical devices such as solar cells and light emitting diodes. The self-assembly of block-copolymers (BCPs) is often viewed as an efficient way to generate such materials. Here, a functional block copolymer that contains perylene bismide (PBI) side chains which can crystallize via π-π stacking to form an electron conducting microphase is patterned harnessing hierarchical electrohydrodynamic lithography (HEHL). HEHL film destabilization creates a hierarchical structure with three distinct length scales: (1) micrometer-sized polymer pillars, containing (2) a 10-nm BCP microphase morphology that is aligned perpendicular to the substrate surface and (3) on a molecular length scale (0.35-3 nm) PBI π-π-stacks traverse the HEHL-generated plugs in a continuous fashion. The good control over BCP and PBI alignment inside the generated vertical microstructures gives rise to liquid-crystal-like optical dichroism of the HEHL patterned films, and improves the electron conductivity across the film by 3 orders of magnitude. © 2013 American Chemical Society.

Item Type: Article
Uncontrolled Keywords: anisotropic optical behavior electron-conducting block-co-polymer hierarchical electrohydrodynamic patterning orientation of crystallinity
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:41
Last Modified: 22 Dec 2014 01:21
DOI: 10.1021/cm3038075