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Tailorable PC71BM Isomers: Using the Most Prevalent Electron Acceptor to Obtain High-Performance Polymer Solar Cells.
- Source :
- Chemistry - A European Journal; 12/23/2016, Vol. 22 Issue 52, p18709-18713, 5p
- Publication Year :
- 2016
-
Abstract
- Despite being widely used as electron acceptor in polymer solar cells, commercially available PC<subscript>71</subscript>BM (phenyl-C<subscript>71</subscript>-butyric acid methyl ester) usually has a 'random' composition of mixed regioisomers or stereoisomers. Here PC<subscript>71</subscript>BM has been isolated into three typical isomers, α-, β<subscript>1</subscript>- and β<subscript>2</subscript>-PC<subscript>71</subscript>BM, to establish the isomer-dependent photovoltaic performance on changing the ternary composition of α-, β<subscript>1</subscript>- and β<subscript>2</subscript>-PC<subscript>71</subscript>BM. Mixing the isomers in a ratio of α/β<subscript>1</subscript>/β<subscript>2</subscript>=8:1:1 resulted in the best power conversion efficiency (PCE) of 7.67 % for the polymer solar cells with PTB7:PC<subscript>71</subscript>BM as photoactive layer (PTB7=poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2- b:4,5- b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4- b]thiophenediyl]]). The three typical PC<subscript>71</subscript>BM isomers, even though sharing similar LUMO energy levels and light absorption, render starkly different photovoltaic performances with average-performing PCE of 1.28-7.44 % due to diverse self-aggregation of individual or mixed PC<subscript>71</subscript>BM isomers in the otherwise same polymer solar cells. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09476539
- Volume :
- 22
- Issue :
- 52
- Database :
- Complementary Index
- Journal :
- Chemistry - A European Journal
- Publication Type :
- Academic Journal
- Accession number :
- 120308179
- Full Text :
- https://doi.org/10.1002/chem.201604263