Impact of dimerization on phase separation and crystallinity in bulk heterojunction films containing non-fullerene acceptors

Stoltzfus, Dani M., Clulow, Andrew J., Jin, Hui, Burn, Paul L. and Gentle, Ian R. (2016) Impact of dimerization on phase separation and crystallinity in bulk heterojunction films containing non-fullerene acceptors. Macromolecules, 49 12: 4404-4415. doi:10.1021/acs.macromol.6b00984


Author Stoltzfus, Dani M.
Clulow, Andrew J.
Jin, Hui
Burn, Paul L.
Gentle, Ian R.
Title Impact of dimerization on phase separation and crystallinity in bulk heterojunction films containing non-fullerene acceptors
Journal name Macromolecules   Check publisher's open access policy
ISSN 1520-5835
0024-9297
Publication date 2016-06-28
Year available 2016
Sub-type Article (original research)
DOI 10.1021/acs.macromol.6b00984
Open Access Status Not Open Access
Volume 49
Issue 12
Start page 4404
End page 4415
Total pages 12
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2017
Language eng
Formatted abstract
We report the synthesis of monomeric and dimeric dicyanovinylbenzothiadiazole-based non-fullerene acceptors and investigate the phase behavior of blend systems comprising poly(3-n-hexylthiophene) (P3HT) and the new materials. Differential scanning calorimetry (DSC) thermograms of blends with different compositions revealed that no eutectic composition existed for the blends, in contrast to previously reported P3HT/non-fullerene acceptor combinations. Analysis of the DSC data shows that the thermal properties of the P3HT and the dimeric non-fullerene acceptor are almost independent of blend composition. However, the thermal properties of blends containing the monomeric acceptor were found to depend strongly on the blend composition, with increasing concentrations of the monomeric acceptor depressing the observed melting point of the polymer. These results are complemented by specular X-ray diffraction data, which reveals stark differences in the crystallinity of the two blend systems. In the case of the dimeric acceptor, the polymer and non-fullerene molecules crystallize in a form similar to that of the neat compounds, whereas in the case of the monomeric acceptor the crystallinity of both molecules is substantially altered by the other. We then correlate the structure of the materials with the organic solar cell performance.
Keyword Phase Separation
Crystallinity
Heterojunction Films
Poly(3-alkylthiophene)s (P3ATs)
Differential scanning calorimetry (DSC)
Non-fullerene acceptors
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Chemistry and Molecular Biosciences
 
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