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Microsecond photoresponse in liquid crystalline photoconductor doped with C70 under illumination of visible light

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2 Author(s)
Funahashi, Masahiro ; Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, 226-8503 Japan ; Hanna, Jun-ichi

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Steady-state and transient photocurrent measurements were carried out for C70-doped liquid crystalline photoconductor, 2-(4-octylphenyl)-6-dodecyloxy-naphthalene (8-PNP-O12) in order to clarify its spectral photosensitization in visible region. The C70-doped liquid crystal cells exhibited a photoresponse in visible region of 400–700 nm corresponding to the optical absorption of C70. In the time-of-flight measurement, the fast transient photosignals with fast rise and decay on the order of microseconds were obtained even in a bulk excitation condition, which is governed by the carrier transit. These indicated that C70 can inject both electron and hole into 8-PNP-O12 when photoexcited and does not deteriorate the carrier transport, demonstrating a possible application of liquid crystalline photoconductors to high-speed photosensors with a fast response in microseconds. © 1999 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:74 ,  Issue: 18 )

Date of Publication:

May 1999

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