Picard, Florian and Lincker, Frédéric and Kervella, Yann and Zagorska, Malgorzata and DeBettignies, Rémi and Peigney, Alain and Flahaut, Emmanuel and Louarn, Guy and Lefrant, Serge and Demadrille, Renaud and Pron, Adam Composites of Double-Walled Carbon Nanotubes with bis-Quaterthiophene-Fluorenone Conjugated Oligomer: Spectroelectrochemical and Photovoltaic Properties. (2009) The Journal of Physical Chemistry C (n° 113). pp. 17347-17354. ISSN 1932-7455
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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp906112p
A new composite consisting of a semiconducting oligomer, namely 2,7-bis-(3,3′′′-didodecyl-[2,2′,5′,2′′;5′′,2′′′]quaterthiophen-5-yl)-fluoren-9-one (QTF12), and double wall carbon nanotubes (DWCNT) has been prepared in view of its application as an active component in bulk heterojunction photovoltaic cells. Raman spectroelectrochemical investigations show that the onset of the oxidative doping of QTF12 in the presence of DWCNT occurs at E ) 0.475 V vs Ag/Ag+, that is, by 50 mV lower than in the case of pure QTF12. This effect was independently confirmed by UV-vis-NIR spectroelectrochemistry. The lowering of the oxidative doping potential, detected by spectroelectrochemistry, can be taken as a spectroscopic evidence of oligomer-nanotube interactions which result in raising, by 0.05 eV, the HOMO level of these QTF12 molecules which are at the interface with DWCNT. Bulk heterojunction test photovoltaic cells consisting of a ternary system (QTF12-DWCNT, PCBM) show the open circuit voltage (Voc) ) 0.53 V and the power conversion efficiency of 0.43%.
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