Tetrathienodibenzocarbazole Based Donor鈥揂cceptor Type Wide Band-Gap Copolymers for Polymer Solar Cell Applications

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• 作者：Zhong鈥檃n Li ; Yue Zang ; Chu-Chen Chueh ; Namchul Cho ; Jinrong Lu ; Xuyang Wang ; Jiang Huang ; Chang-Zhi Li ; Junsheng Yu ; Alex K.-Y. Jen
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：November 11, 2014
• 年：2014
• 卷：47
• 期：21
• 页码：7407-7415
• 全文大小：476K
• ISSN：1520-5835

文摘

Two new donor鈥揳cceptor alternating wide band gap copolymers, PTTDBC-PhQC8 and PTTDBC-BTC12, based on an electron-rich tetrathienodibenzocarbazole (TTDBC) donor have been designed and synthesized, wherein two additional thienyl rings are fused into a 2,7-dithienylcarbazole skeleton to reinforce the structural coplanarity and rigidity of polymers. The quinoid thiophene in TTDBC can endow not only a wide optical band gap (鈭?.9 eV) but also a deep HOMO (鈭?.3 eV) for the resulting polymers. The conventional configuration solar cells based on PTTDBC-BTC12 exhibit a large V_oc of 0.91 V and a power conversion efficiency of 4.30% (with a J_sc of 9.27 mA cm^鈥? and a FF of 0.51), while a slightly higher PCE of 4.50% can be achieved for the inverted structure devices. We believe that these wide band gap polymers have potential to be used for tandem cell applications.