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Efficient Vacuum‐Deposited Organic Solar Cells Based on a New Low‐Bandgap Oligothiophene and Fullerene C 60
Author(s) -
Schulze K.,
Uhrich C.,
Schüppel R.,
Leo K.,
Pfeiffer M.,
Brier E.,
Reinold E.,
Bäuerle P.
Publication year - 2006
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200600658
Subject(s) - materials science , fullerene , band gap , organic solar cell , optoelectronics , heterojunction , absorption (acoustics) , ionization energy , photochemistry , ionization , organic chemistry , polymer , chemistry , ion , composite material
Organic solar cells based on a new oligothiophene derivative (see figure) and fullerene C 60 exhibit power efficiencies of up to 3.4 %. α,α′‐Bis(2,2‐dicyanovinyl)‐quinquethiophene (DCV5T) features a reduced optical gap with high absorption coefficients between 450 and 650 nm. Dicyanovinyl substituents on the oligothiophene rings lower the bandgap and increase the ionization energy of these oligomers, enabling the formation of photoactive heterojunctions with C 60 and yielding open‐circuit photovoltages as high as 1 V.