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Enhanced Photocurrent Spectral Response in Low‐Bandgap Polyfluorene and C 70 ‐Derivative‐Based Solar Cells
Author(s) -
Wang X.,
Perzon E.,
Oswald F.,
Langa F.,
Admassie S.,
Andersson M. R.,
Inganäs O.
Publication year - 2005
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200500114
Subject(s) - materials science , photocurrent , polyfluorene , optoelectronics , photoluminescence , band gap , photochemistry , acceptor , energy conversion efficiency , open circuit voltage , fluorene , electroluminescence , polymer , voltage , nanotechnology , chemistry , physics , layer (electronics) , condensed matter physics , quantum mechanics , composite material
Plastic solar cells have been fabricated using a low‐bandgap alternating copolymer of fluorene and a donor–acceptor–donor moiety (APFO‐Green1), blended with 3′‐(3,5‐bis‐trifluoromethylphenyl)‐1′‐(4‐nitrophenyl)pyrazolino[70]fullerene (BTPF70) as electron acceptor. The polymer shows optical absorption in two wavelength ranges, λ < 500 nm and 600 < λ < 1000 nm. The BTPF70 absorbs light at λ < 700 nm. A broad photocurrent spectral response in the wavelength range 300 < λ < 1000 nm is obtained in solar cells. A photocurrent density of 3.4 mA cm –2 , open‐circuit voltage of 0.58 V, and power‐conversion efficiency of 0.7 % are achieved under illumination of AM1.5 (1000 W m –2 ) from a solar simulator. Synthesis of BTPF70 is presented. Photoluminescence quenching and electrochemical studies are used to discuss photoinduced charge transfer.