Innovative architectures to simultaneously enhance organic photovoltaic device stability and efficiency

2015 Fiscal Year Final Research Report

• Project/Area Number: 26889029
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Electronic materials/Electric materials
• Research Institution: The University of Electro-Communications
• Principal Investigator: VOHRA Varun 電気通信大学, 情報理工学(系)研究科, 助教 (10731713)
• Project Period (FY): 2014-08-29 – 2016-03-31
• Keywords: 有機エレクトロニクス / 有機太陽電池 / 分子配向 / 結晶化 / 分子濃度

Outline of Final Research Achievements

We have demonstrated that controlling the crystallinity and the vertical concentration gradient in regular organic solar cells can result in devices with fill factors (FF) as high as 67%. Furthermore, our polymer:fullerene active layers exhibit a crystallite orientation gradient which is favourable to inverted device architectures. Consequently, inverted devices display an even higher FF reaching 73% with a record PCE of 10.1%.
We successfully developed a process (transfer-printing) to fabricate inverted organic solar cells with the adequate donor-acceptor concentration gradient. Compared with the spin-coated reference devices, they display a 40% increase in FF and PCE.

Free Research Field

有機太陽電池