Aggregation in a High Mobility n-type Low Bandgap Copolymer with Implications on Semicrystalline Morphology.
Summary of "Aggregation in a High Mobility n-type Low Bandgap Copolymer with Implications on Semicrystalline Morphology."
We explore the photophysics of P(NDI2OD-T2), a high mobility and air stable n-type donor/acceptor polymer. Detailed steady-state UV-Vis and Photoluminescence measurements on solutions of P(NDI2OD-T2) reveal distinct signatures of aggregation. By performing quantum chemical calculations, we can assign these spectral features to unaggregated and stacked polymer chains. NMR measurements independently confirm the aggregation phenomena of P(NDI2OD-T2) in solution. The detailed analysis of the optical spectra suggests that aggregation is a two-step process with different types of aggregates which we confirm by time-dependent photoluminescence measurements. Analytical ultracentrifugation measurements demonstrate that aggregation takes place within the single polymer chain upon coiling. By transferring these results to thin P(NDI2OD-T2) films, we can conclude that film formation is mainly governed by the chain collapse leading in general to a high aggregate content of ~45%. This process also inhibits the formation of amorphous and disordered P(NDI2OD-T2) films.
Affiliation
Journal Details
This article was published in the following journal.
Name: Journal of the American Chemical Society
ISSN: 1520-5126
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22957688
- DOI: http://dx.doi.org/10.1021/ja306844f
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