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Lanzi M.♦, Salatelli E.♦, Di-Nicola F.P.♦, Zuppiroli L.♦, Pierini F., A new photocrosslinkable oligothiophene for organic solar cells with enhanced stability,
MATERIALS CHEMISTRY AND PHYSICS, ISSN: 0254-0584, DOI: 10.1016/j.matchemphys.2016.10.034, Vol.186, pp.98-107, 2017 Abstract:
A novel thiophenic tetramer containing a cinnamate group in the side chain with a functionalization degree of 50% is reported. The tetramer was obtained by means of a simple and straightforward procedure involving the functionalization of a p-methoxyphenoxy substituted thiophenic precursor, which led to a soluble product with a good yield. The oligomer was fully characterized from a structural and chemical point of view and employed for the fabrication of small molecule organic solar cells exploiting the bulk heterojunction (BHJ) architecture. The presence of an UV-light sensitive group in the tetramer allowed the photocrosslinking of tetramer/PCBM blends, giving high values of photocurrent and conversion efficiency for the exposed samples. Moreover, the UV-treated devices showed improved stability, even upon heating for three days at 130 °C, thus confirming that photocrosslinking can strongly reduce phase segregation under severe operational conditions. Keywords:
electronic materials, polymers, fullerenes, nanostructures, electrical characterization, semiconductors Affiliations:
| Lanzi M. | - | University of Bologna (IT) | | Salatelli E. | - | University of Bologna (IT) | | Di-Nicola F.P. | - | University of Bologna (IT) | | Zuppiroli L. | - | University of Bologna (IT) | | Pierini F. | - | IPPT PAN |
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