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JST Press Release

Oct. 22, 2013
Japan Science and Technology Agency (JST)
5-3, Yonbancho, Chiyoda-ku, Tokyo 102-8666
URL http://www.jst.go.jp/EN/index.html

Modification of Donor/Acceptor Interfaces Enhanced Open Circuit Voltage without Loss of Short Circuit Current in Organic Solar Cells

The short circuit current density (JSC) and the open circuit voltage (VOC) are two key factors that have critical influence on the performance of organic solar cells (OSCs). We have found that separating the donor and acceptor layer in bilayer OSCs with a thin insulating layer increases the energy of charge transfer (CT) state by weakening the Coulomb interaction at the interface and this also suppresses photoinduced CT and recombination. Although these effects usually increase VOC and decrease JSC, the trade-off is avoided by doping the insulating layer with a dye to utilize the energy transfer process. The increase in VOC without the reduction in JSC enhances the conversion efficiency of the OSCs by 30%.

Researcher Information

Research Area: “Photoenergy Conversion Systems and Materials for the Next Generation Solar Cells”
Research Theme: “Precise Control of Organic Interfaces toward Highly Efficient Photovoltaic Processes”

Journal Information

Yufei Zhong, Akira Tada, Seiichiro Izawa, Kazuhito Hashimoto, Keisuke Tajima
“Enhancement of VOC without Loss of JSC in Organic Solar Cells by Modification of Donor/Acceptor Interfaces”
Advanced Energy Materials, Published online 22 Oct. 2013
doi: 10.1002/aenm.201301332


[About Research]
Keisuke Tajima, Ph.D.
Team Leader, Center for Emergent Matter Science, RIKEN

[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/