NDLI: Structure formation in P3HT/F8TBT blends

Content Provider	Royal Society of Chemistry (RSC)
Author	Sheng, Xiaoyuan Sepe, Alessandro Steiner, Ullrich Hüttner, Sven Müller-Buschbaum, Peter Rong, Zhuxia Yang, Le Friend, Richard H. Vaynzof, Yana Sommer, Michael Smilgies, Detlef-M. Tan, Zhi-Kuang
Copyright Year	2014
Abstract	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)-2′,2′′-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.
Starting Page	1725
Ending Page	1736
Page Count	12
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	7
Issue Number	5
Journal	Energy & Environmental Science
DOI	10.1039/c3ee44125c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Polythiophene Phenyl-C61-butyric acid methyl ester Miscibility gap X-ray scattering techniques Heterojunction Grain boundary Solar cell Nanostructure Exciton Dissociative
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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