Probing the nanoscale phase separation in binary photovoltaic blends of poly(3-hexylthiophene) and methanofullerene by energy transfer

Ruseckas, Arvydas, Shaw, Paul E. and Samuel, Ifor D. W. (2009) Probing the nanoscale phase separation in binary photovoltaic blends of poly(3-hexylthiophene) and methanofullerene by energy transfer. Dalton Transactions, 45: 10040-10043. doi:10.1039/b912198f

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Author Ruseckas, Arvydas
Shaw, Paul E.
Samuel, Ifor D. W.
Title Probing the nanoscale phase separation in binary photovoltaic blends of poly(3-hexylthiophene) and methanofullerene by energy transfer
Journal name Dalton Transactions   Check publisher's open access policy
ISSN 1477-9226
1477-9234
Publication date 2009
Sub-type Article (original research)
DOI 10.1039/b912198f
Open Access Status File (Publisher version)
Issue 45
Start page 10040
End page 10043
Total pages 4
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Abstract The generation of charge carriers in organic photovoltaic devices requires exciton diffusion to an interface of electron donor and acceptor materials, where charge separation occurs. We report a time resolved study of fluorescence quenching in films of poly(3-hexylthiophene) containing a range of fractions of the electron acceptor [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). We show that energy transfer from P3HT to PCBM helps to bring excitons to the interface, where they dissociate into charge carriers. Fluorescence quenching in blends with ≤50 wt% of PCBM is controlled by exciton diffusion in P3HT. This allows us to estimate the average size of PCBM domains to be about 9 nm in the 1:1 blend. The implications for polymer solar cells are discussed.
Keyword Bulk Heterojunction Materials
Solar-Cells
Carrier Generation
Charge-Transfer
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemistry and Molecular Biosciences
 
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