In:
Chemistry – A European Journal, Wiley, Vol. 22, No. 52 ( 2016-12-23), p. 18709-18713
Abstract:
Despite being widely used as electron acceptor in polymer solar cells, commercially available PC 71 BM (phenyl‐C 71 ‐butyric acid methyl ester) usually has a “random” composition of mixed regioisomers or stereoisomers. Here PC 71 BM has been isolated into three typical isomers, α‐, β 1 ‐ and β 2 ‐PC 71 BM, to establish the isomer‐dependent photovoltaic performance on changing the ternary composition of α‐, β 1 ‐ and β 2 ‐PC 71 BM. Mixing the isomers in a ratio of α/β 1 /β 2 =8:1:1 resulted in the best power conversion efficiency (PCE) of 7.67 % for the polymer solar cells with PTB7:PC 71 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 71 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 71 BM isomers in the otherwise same polymer solar cells.
Type of Medium:
Online Resource
ISSN:
0947-6539
,
1521-3765
DOI:
10.1002/chem.201604263
Language:
English
Publisher:
Wiley
Publication Date:
2016
detail.hit.zdb_id:
1478547-X
detail.hit.zdb_id:
1231884-X
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