Enhanced Photocurrent Spectral Response in Low‐Bandgap Polyfluorene and C70‐Derivative‐Based Solar Cells

Advanced Functional Materials - Tập 15 Số 10 - Trang 1665-1670 - 2005
Xiaoyu Wang1, Erik Perzon2, Frédéric Oswald3, Fernando Langa3, Shimelis Admassie1, Mats R. Andersson2, Olle Inganäs1
1Biomolecular and Organic Electronics, IFM, Linköping University, S-581 83 Linköping, Sweden
2Materials and Surface Chemistry, Chalmers University of Technology, S‐412 96 Göteborg, Sweden
3Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, ES-45071, Toledo, Spain

Tóm tắt

AbstractPlastic 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.

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Advanced Functional Materials

Tập 15 Số 10

1665-1670

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