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JST Press Release

Oct. 07, 2013
Japan Science and Technology Agency (JST)
5-3, Yonbancho, Chiyoda-ku, Tokyo 102-8666
URL http://www.jst.go.jp/EN/index.html

Development of a methodology to control polymer orientation - improving solar cell efficiency

We have successfully controlled the polymer orientation by carefully tuning the length and shape of the solubilizing alkyl side chains. With the ideal polymer orientation, charge carriers generated upon sun light absorption can effectively travel through the polymer films, which resulted in the significant improvement of the power conversion efficiency in polymer-based solar cells. This methodology would pave the way towards the practical use of polymer-based solar cells.

Researcher Information

Research Area: “Photoenergy conversion systems and materials for the next generation solar cells”
Research Theme: “Novel semiconducting polymers toward high efficiency organic thin film solar cells”

Journal Information

Itaru Osaka, Masahiko Saito, Tomoyuki Koganezawa, Kazuo Takimiya.
“Thiophene-Thiazolothiazole Copolymers: Significant Impact of Side Chain Composition on Backbone Orientation and Solar Cell Performances”
Advanced Materials, Published online 8 October 2013
doi: 10.1002/adma.201303059


[About Research]
Itaru Osaka, Ph.D.
Senior Research Scientist, Center for Emergent Matter Science, RIKEN

[About Program]
Koji Matsuo, Masashi Furukawa, Natsuko Kawazoe
Green Innovation Group, Department of Innovation Research,
Japan Science and Technology Agency


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/