Document Detail


Directed Assembly of P3HT:PCBM Blend Films Using A Chemical Template With Sub-300 nm Features.
MedLine Citation:
PMID:  23294517     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Surface energy has been demonstrated as a means to direct interfacial-layer composition in polymer:fullerene blends utilized as active layers in organic photovoltaic (OPV) devices. Combined with recent materials advances in the preparation of nanoscale chemical patterns, surface energy directed control of nanophase separation presents an opportunity to employ patterned surface energy templates to control the 3D blend morphology of polymer:fullerene blends. This report details the directed assembly of poly(3 hexylthiophene):phenyl-C61-butyric acid methyl ester (P3HT:PCBM) blends atop linear grating patterns with domains of alternating high- and low-surface energy 50 to 600 nm wide prepared by Nanoscale Oxidative Lithography (NOL) of alkyl-terminated self assembled monolayers (SAMs) on SiO2 and SiH surfaces. Studies using tapping-, contact-, and current-sensing AFM modes have demonstrated that chemical patterns are effective at directing the 3D morphology of P3HT:PCBM blends at dimensions > 200 nm. As the dimensionality of domains approached 100 nm the chemical patterns were no longer able to direct phase segregation, evidence that a directed spinodal decompositon mechanism was responsible for the observed morphology. Surprisingly, the low-surface energy component (P3HT) was found to be atop the high-surface energy domains of the template, in conflict with current understanding of the role of surface energy directed assembly in polymer blends. These results suggest that the directed-spinodal decomposition mechanism applies to conjugated polymer:fullerene blends, but that additional parameters unique to these types of systems will require refinement of the theory to adequately describe and predict the behavior of these scientifically and industrially interesting materials.
Authors:
David S Germack; Antonio Checco; Benjamin M Ocko
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-8
Journal Detail:
Title:  ACS nano     Volume:  -     ISSN:  1936-086X     ISO Abbreviation:  ACS Nano     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101313589     Medline TA:  ACS Nano     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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