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JST Press Release

Dec. 25, 2013
Japan Science and Technology Agency (JST)
5-3, Yonbancho, Chiyoda-ku, Tokyo 102-8666
URL http://www.jst.go.jp/EN/index.html

Experimental elucidation of mechanism of efficient photocurrent generation
in the organic thin-film solar cells

Nanosecond time-resolved electron paramagnetic resonance spectroscopy has been utilized to determine geometries and electronic couplings of transient charge-separated (CS) states in the photoactive layers of the organic thin-film solar cells. Generations of highly distant CS states are explained by a coupling of the hole dissociation to the polymer librations. Shallowly trapped, delocalized electron–hole pairs have been characterized at the organic photovoltaic interfaces. This unique molecular-wire behavior and the effect of the molecular motions on the carrier dissociations in the interface are keys for designs of more efficient organic active layers.

Researcher Information

Research Area :
" Photoenergy conversion systems and materials for the next generation solar cells"

Research Theme :
" Analysis of electron-transport function on organic solar-cell substrate using electron spin coherence measurements"

Journal Information

Taku Miura, Motoko Aikawa, and Yasuhiro Kobori.
“Time-Resolved EPR Study of Electron-Hole Dissociations Influenced by Alkyl Side Chains at the Photovoltaic Polyalkylthiophene:PCBM Interface”
Journal of Physical Chemistry Letters, December 24, 2013
doi: 10.1021/jz402300m


[About Research]
Yasuhiro Kobori, Ph.D.
Professor, Department of Chemistry, Graduate School of Science, Kobe University

[About Program]
Koji Matsuo, Masashi Furukawa, Natsuko Kawazoe
Green Innovation Group, Department of Innovation Research, JST


JST, an integrated organization of science and technology in Japan, establishes an infrastructure for the entire process from the creation of knowledge to the return to the society. For more information, visit http://www.jst.go.jp/EN/