A comparative study of diketopyrrolopyrrole and isoindigo based polymers for organic photovoltaic applications

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• 作者：Shugang Li^a ; Jianyu Yuan^b ; Ping Deng^a ; Wanli Ma^b ; ^{wlma@suda.edu.cn" class="auth_mail} ; Qing Zhang^a ; ^{qz14@sjtu.edu.cn" class="auth_mail}
• 关键词：Isoindigo ; Diketopyrrolopyrrole ; Naphthodifuran ; Low bandgap polymer ; Polymer solar cells ; Donor/acceptor polymers
• 刊名：Dyes and Pigments
• 出版年：July, 2014
• 年：2014
• 卷：106
• 期：Complete
• 页码：121-127
• 全文大小：2585 K

文摘

Two new donor/acceptor 蟺-conjugated polymers with functional dyes, either diketopyrrolopyrrole or isoindigo as the electron accepting units and 5,10-bis(2,3-didecylthiophen-5-yl)-naphtho[1,2-b:5,6-b鈥瞉difuran as an electron donating units have been synthesized. The photo-physical, electrochemical and photovoltaic properties of the new polymers have been studied and compared. With the same donor unit, the diketopyrrolopyrrole based polymer showed low bandgap and broad absorption extended into near IR region. The isoindigo based polymer showed little absorption in near IR region. However, the isoindigo based polymer showed more efficient absorption than diketopyrrolopyrrole based polymer in the most of visible region (from 300 to 690聽nm) in solution. The isoindigo based polymer showed lower HOMO and LUMO energy levels than diketopyrrolopyrrole based polymer. The isoindigo polymer based solar cell devices consistently showed higher open circuit voltages than the diketopyrrolopyrrole polymer based devices.