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Structure formation in P3HT/F8TBT blends

Title data

Sepe, Alessandro ; Rong, Zhuxia ; Sommer, Michael ; Vaynzof, Yana ; Sheng, Xiaoyuan ; Müller-Buschbaum, Peter ; Smilgies, Detlef-M. ; Tan, Zhi-Kuang ; Yang, Le ; Friend, Richard H. ; Steiner, Ullrich ; Hüttner, Sven:
Structure formation in P3HT/F8TBT blends.
In: Energy & Environmental Science. Vol. 7 (2014) Issue 5 . - pp. 1725-1736.
ISSN 1754-5692
DOI: https://doi.org/10.1039/C3EE44125C

Abstract in another language

The structure evolution of all-polymer solar cells based on the blends of poly(3-hexylthiophene) (P3HT) and poly(9{,}9-dioctyluorene)-2{,}7-diyl-alt-(4{,}7-bis(3-hexylthien-5-yl)-2{,}1{,}3-benzothiadiazole)-2prime or minute],2prime or minuteprime or minute-diyl (F8TBT) was investigated. The P3HT/F8TBT system exhibits crystallization-driven structure formation similar to the P3HT/phenyl-C61-butyricacidmethylester (PCBM) blend despite the existence of a miscibility gap{,} which was determined for a blend containing regio-random P3HT. The lamellar crystallization of regio-regular P3HT was not perturbed by the addition of F8TBT. X-ray scattering studies indicate that F8TBT is segregated to the interlamellar amorphous phase{,} establishing a bulk heterojunction framework with the crystalline lamellae of P3HT. The excess F8TBT is accommodated at the film-substrate interface and at amorphous grain boundaries. The structural studies were correlated with the photovoltaic device performance of blend films that consisted of large P3HT spherulites. These device results emphasize the importance of a mesoscopic F8TBT network that separates the P3HT crystal domains. Our results suggest that the nanostructure formation in P3HT/F8TBT blends is determined by P3HT crystallization{,} resulting both in a 10 nm crystalline morphology and a F8TBT mesoscopic segregation network{,} both of which are beneficial for exciton dissociation.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy > Junior Professorship Solar Energy - Juniorprof. Dr. Sven Hüttner
Profile Fields > Advanced Fields > Polymer and Colloid Science
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 30 Aug 2017 06:07
Last Modified: 16 Apr 2018 11:48
URI: https://eref.uni-bayreuth.de/id/eprint/39200