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Enhanced photocurrent spectral response in low-bandgap polyfluorene and C<sub>70</sub>-Derivative-Based Solar Cells
Article in journal
Xiangjun Wang, Erik Perzon, Frédéric Oswald, Fernando Langa, Shimelis Admassie, Mats R. Andersson, Olle Inganäs
Publication Year
Advanced Functional Materials, 2005, (15)10, 1665-1670
Link to Source (DOI)
<p>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<img src="http://www3.interscience.wiley.com/giflibrary/12/prime.gif" />-(3,5-bis-trifluoromethylphenyl)-1<img src="http://www3.interscience.wiley.com/giflibrary/12/prime.gif" />-(4-nitrophenyl)pyrazolino[70]fullerene (BTPF70) as electron acceptor. The polymer shows optical absorption in two wavelength ranges, <img src="http://www3.interscience.wiley.com/giflibrary/12/lambda.gif" /> &lt; 500 nm and 600 &lt; <img src="http://www3.interscience.wiley.com/giflibrary/12/lambda.gif" /> &lt; 1000 nm. The BTPF70 absorbs light at <img src="http://www3.interscience.wiley.com/giflibrary/12/lambda.gif" /> &lt; 700 nm. A broad photocurrent spectral response in the wavelength range 300 &lt; <img src="http://www3.interscience.wiley.com/giflibrary/12/lambda.gif" /> &lt; 1000 nm is obtained in solar cells. A photocurrent density of 3.4 mA cm<sup>-2</sup>, open-circuit voltage of 0.58 V, and power-conversion efficiency of 0.7 % are achieved under illumination of AM1.5 (1000 W m<sup>-2</sup>) from a solar simulator. Synthesis of BTPF70 is presented. Photoluminescence quenching and electrochemical studies are used to discuss photoinduced charge transfer.</p>