TY - JOUR
T1 - Good solvent effects of C70 cluster formations and their electron-transporting and photoelectrochemical properties
AU - Tezuka, Noriyasu
AU - Umeyama, Tomokazu
AU - Matano, Yoshihiro
AU - Shishido, Tetsuya
AU - Kawasaki, Mitsuo
AU - Nishi, Masayuki
AU - Hirao, Kazuyuki
AU - Lehtivuori, Heli
AU - Tkachenko, Nikolai V.
AU - Lemmetyinen, Helge
AU - Honsho, Yoshihito
AU - Seki, Shu
AU - Imahori, Hiroshi
PY - 2010/11/8
Y1 - 2010/11/8
N2 - Good solvent effects of C70 cluster formations and their electron-transporting and photoelectrochemical properties have been systematically examined for the first time. Nano-to-micrometer scale assemblies of C70 with different morphologies were prepared by rapidly injecting poor solvent (i.e., acetonitrile) into a solution of C70 dissolved in various good solvents (i.e., benzene, toluene, chlorobenzene, etc). The cluster morphology engineering was successfully achieved by changing the good solvent, yielding the spherical, rodlike, or platelike clusters in the mixed solvents. The clusters of C70 were electrophoretically deposited onto a nanostructured SnO2 electrode to examine the photoelectrochemical properties under the white light or monochromatic light illumination. The maximum incident photon-to-current efficiency (IPCE) varied from 0.8 to 10% depending on the combinations of the poor-good solvents. The differences in the IPCE values are discussed in terms of the surface area, thickness, and electron mobility of the deposited cluster films. The electron mobility is found to be the most predominant factor for the IPCE, indicating the importance of the electron-transporting process in the overall photocurrent generation. In addition, the electron mobility is closely correlated with the underlying molecular alignment and the resultant cluster structure. Thus, these results will provide basic clue for the design of C70-based molecular devices including the organic photovoltaics.
AB - Good solvent effects of C70 cluster formations and their electron-transporting and photoelectrochemical properties have been systematically examined for the first time. Nano-to-micrometer scale assemblies of C70 with different morphologies were prepared by rapidly injecting poor solvent (i.e., acetonitrile) into a solution of C70 dissolved in various good solvents (i.e., benzene, toluene, chlorobenzene, etc). The cluster morphology engineering was successfully achieved by changing the good solvent, yielding the spherical, rodlike, or platelike clusters in the mixed solvents. The clusters of C70 were electrophoretically deposited onto a nanostructured SnO2 electrode to examine the photoelectrochemical properties under the white light or monochromatic light illumination. The maximum incident photon-to-current efficiency (IPCE) varied from 0.8 to 10% depending on the combinations of the poor-good solvents. The differences in the IPCE values are discussed in terms of the surface area, thickness, and electron mobility of the deposited cluster films. The electron mobility is found to be the most predominant factor for the IPCE, indicating the importance of the electron-transporting process in the overall photocurrent generation. In addition, the electron mobility is closely correlated with the underlying molecular alignment and the resultant cluster structure. Thus, these results will provide basic clue for the design of C70-based molecular devices including the organic photovoltaics.
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U2 - 10.1021/jp911141s
DO - 10.1021/jp911141s
M3 - Article
C2 - 20136111
AN - SCOPUS:79952278997
VL - 114
SP - 14287
EP - 14297
JO - The Journal of Physical Chemistry B
JF - The Journal of Physical Chemistry B
SN - 1520-6106
IS - 45
ER -