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Science 15 December 2006:
Vol. 314. no. 5806, p. 1653
DOI: 10.1126/science.314.5806.1653d
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In an organic photovoltaic devices, separate electron donor and acceptor layers harvest charge carriers created by absorption of photons. Yamamoto et al. (p. 1761; see the Perspective by Würthner) have self-assembled coaxial nanotubes from molecules that contain a large electron-donating aromatic core (hexabenzocoronene) on which is appended, via a long, flexible linker, an electron-accepting trinitrofluoronene group. These nanowires are 16 nanometers in diameter and several micrometers in length. When cast as films on electrodes, the nanotubes show large changes in conductivity (on-off ratios in excess of 104) when irradiated with ultraviolet-visible light. The nanotubes avoid formation of a nonconducting charge-transfer complex that was seen in an alternate microfiber morphology of these same molecules.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)