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Fullerene Aggregation in Thin Films of Polymer Blends for Solar Cell Applications.

Fullerene Aggregation in Thin Films of Polymer Blends for Solar Cell Applications.

Authors :
Lindqvist C
Moons E
van Stam J
Source :
Materials (Basel, Switzerland) [Materials (Basel)] 2018 Oct 23; Vol. 11 (11). Date of Electronic Publication: 2018 Oct 23.
Publication Year :
2018

Abstract

We report on the effects of the film morphology on the fluorescence spectra for a thin film including a quinoxaline-based co-polymer (TQ1) and a fullerene derivative ([6,6]-phenyl-C <subscript>71</subscript> -butyric acid methyl ester-PC <subscript>70</subscript> BM). The ratio between the polymer and the fullerene derivative, as well as the processing solvent, were varied. Besides the main emission peak at 700 nm in the fluorescence spectra of thin films of this phase-separated blend, a broad emission band is observed with a maximum at 520⁻550 nm. The intensity of this emission band decreases with an increasing degree of mixing in the film and becomes most prominent in thicker films, films with high PC <subscript>70</subscript> BM content, and films that were spin-coated from solvents with lower PC <subscript>70</subscript> BM solubility. We assign this emission band to aggregated PC <subscript>70</subscript> BM.

Details

Language :
English
ISSN :
1996-1944
Volume :
11
Issue :
11
Database :
MEDLINE
Journal :
Materials (Basel, Switzerland)
Publication Type :
Academic Journal
Accession number :
30360476
Full Text :
https://doi.org/10.3390/ma11112068