標題: Synthesis, Molecular and Photovoltaic Properties of Donor-Acceptor Conjugated Polymers Incorporating a New Heptacylic Indacenodithieno[3,2-b]thiophene Arene
作者: Chang, Huan-Hsuan
Tsai, Che-En
Lai, Yu-Ying
Chiou, De-Yang
Hsu, So-Lin
Hsu, Chain-Shu
Cheng, Yen-Ju
應用化學系
Department of Applied Chemistry
公開日期: 11-十二月-2012
摘要: We have developed a new multifused indacenodithieno[3,2-b]thiophene arene (IDTT) unit where the central phenylene is covalently fastened with the two outer thieno[3,2-b]thiophene (TT) rings, forming two cyclopentadiene rings embedded in a heptacyclic structure. This rigid and coplanar IDTT building block was copolymerized with electron-deficient acceptors, 4,7-dibromo-2,1,3-benzothiadiazole (BT), 4,7-dibromo-5,6-difluoro-2,1,3-benzothiadiazole (FBT) and 1,3-dibromo-thieno[3,4-c]pyrrole-4,6-dione (TPD) via Stifle polymerization, respectively. Because the higher content of the thienothiophene moieties in the fully coplanar IDTT structure facilitates pi-electron delocalization, these new polymers show much improved light-harvesting abilities and enhanced charge mobilities compared to PDITTBT copolymer using hexacyclic diindenothieno[3,2-b]thiophene (DITT) as the donor moieties. The device using PIDTTBT:PC71BM (1:4, w/w) exhibited a decent power conversion efficiency (PCE) of 3.8%. Meanwhile, the solar cell using PIDTTFBT:PC71BM (1:4 in wt %) blend exhibited a greater V-oc value of 0.9 V and a larger J(sc) of 10.08 mA/cm(2), improving the PCE to 4.2%. The enhanced V-oc is attributed to the lower-lying of HOMO energy level of PIDTTFBT as a result of fluorine withdrawing effect on the BT unit. A highest PCE of 4.3% was achieved for the device incorporating PIDTTTPD:PC71BM (1:4 in wt %) blend.
URI: http://dx.doi.org/10.1021/ma3019552
http://hdl.handle.net/11536/20834
ISSN: 0024-9297
DOI: 10.1021/ma3019552
期刊: MACROMOLECULES
Volume: 45
Issue: 23
起始頁: 9282
結束頁: 9291
顯示於類別:期刊論文


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