Alkyl Substituent Length Dependence of Octaalkylphthalocyanine Bulk Heterojunction Solar Cells

Alkyl substituent length dependences of photovoltaic performance of bulk-heterojunction (BHJ) organic solar cells (OSCs) utilizing 1,4,8,11,15,18,22,25-octaalkylphthalocyanine (C$n$PcH 2 ) mixed in [6,6]-phenyl C 71 butyric acid methyl ester have been studied. By shortening the alkyl substituents, s...

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Bibliographic Details
Published in:Applied physics express 2013-12, Vol.6 (12), p.122301-122301-4
Main Authors: Dao, Quang-Duy, Saito, Takashi, Nakano, Shohei, Fukui, Hitoshi, Kamikado, Toshiya, Fujii, Akihiko, Shimizu, Yo, Ozaki, Masanori
Format: Article
Language:English
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Summary:Alkyl substituent length dependences of photovoltaic performance of bulk-heterojunction (BHJ) organic solar cells (OSCs) utilizing 1,4,8,11,15,18,22,25-octaalkylphthalocyanine (C$n$PcH 2 ) mixed in [6,6]-phenyl C 71 butyric acid methyl ester have been studied. By shortening the alkyl substituents, stacking of the discotic C$n$PcH 2 columns is probably changed from 2D rectangular lattices to pseudohexagonal structures, and Davydov splitting at the Q-band of C$n$PcH 2 absorbance spectra decreases, which results in the higher hole mobility and the deeper highest occupied molecular orbital energy levels. As a result, the power conversion efficiencies of C$n$PcH 2 -based BHJ OSCs are improved from 0.3 to 3.7% by changing the alky substituent length.
ISSN:1882-0778
1882-0786
DOI:10.7567/APEX.6.122301