Journal
ACS NANO
Volume 3, Issue 9, Pages 2557-2562Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn900798m
Keywords
polymer solar cells; soluble fullerene; asymmetric nanostructure; Raman scattering; field emission transmission electron microscopy
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Funding
- Korean Government [KOSEF-R01-2007-000-10836-0, KRF-2007-331-D00121, KETEP-2008-N-PV08-J-01-30202008, KOSEF-20090072777]
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We found that 1-(3-methoxycarbonyl)propyl-1-phenyl-(6,6)C-61 (PCBM) molecules make a distorted asymmetric body-centered cubic crystal nanostructure in the bulk heterojunction films of reigoregular poly(3-hexylthiophene) and PCBM. The wider angle of distortion in the PCBM nanocrystals was similar to 96 degrees, which can be assigned to the influence of the attached side group to the fullerene ball of PCBM to bestow solubility. Atom concentration analysis showed that after thermal annealing the PCBM nanocrystals do preferentially distribute above the layer of P3HT nanocrystals inside devices.
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