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Application of self-assembling photosynthetic dye for organic photovoltaics

Published online by Cambridge University Press:  17 January 2011

Ryu Tange ,
Koji Inai ,
Takashi Sagawa  and
Susumu Yoshikawa
Ryu Tange
Affiliation:
Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
Koji Inai
Affiliation:
Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
Takashi Sagawa*
Affiliation:
Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
Susumu Yoshikawa*
Affiliation:
Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan; and Core Research of Evolutional Science & Technology (CREST), Japan Science Technology Agency (JST), Gokasho, Uji, Kyoto 611-0011, Japan
*
a)Address all correspondence to these authors. e-mail: t-sagawa@iae.kyoto-u.ac.jp
b)e-mail: s-yoshi@iae.kyoto-u.ac.jp
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Abstract

We have developed novel photovoltaic systems composed of the fullerene derivative (6,6)-phenyl C61 butyric acid methyl ester as electron acceptor with a second functional organic molecule, in this case bacteriochlorophyll c, as the light-harvesting and photosensitizing part. It was found that heat treatment of a thin film of bacteriochlorophyll c altered the morphological states of the aggregates and conductivity of the thin film could be regulated through the annealing process. Blended fullerene derivative and bacteriochlorophyll c thin films were fabricated on the surface of an indium-tin oxide/poly(ethylene dioxythiophene) doped with polystyrene sulfonic acid substrate layer and their photovoltaic properties were characterized and evaluated. Formation of fullerene-coordinated bacteriochlorophyll c complex was confirmed by changes in the visible absorption spectra and by FTIR. Such complexation promoted generation of photocurrent in the region of the Qyband and the current density of the thin film increased. A maximum incident photon-to-current conversion efficiency of 5.1% was attained at 745 nm.

Type
Reviews
Information
Journal of Materials Research , Volume 26 , Issue 2: Focus Issue: Self-Assembly and Directed Assembly of Advanced Materials , 28 January 2011 , pp. 306 - 310
Copyright
Copyright © Materials Research Society 2011

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