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http://dx.doi.org/10.5012/bkcs.2014.35.5.1485

Synthesis and Characterization of New Dihydroindolo[3,2-b]indole and 5,6-Bis(octyloxy)-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole-Based Polymer for Bulk Heterojunction Polymer Solar Cells  

Kranthiraja, Kakaraparthi (Department of Chemistry Education, Graduate Department of Chemical Materials, BK21 PLUS Team for Advanced Chemical Materials, and Institute for Plastic Information and Energy Materials, Pusan National University)
Gunasekar, Kumarasamy (Department of Chemistry Education, Graduate Department of Chemical Materials, BK21 PLUS Team for Advanced Chemical Materials, and Institute for Plastic Information and Energy Materials, Pusan National University)
Song, Myungkwan (Surface Technology Division, Korea Institute of Materials Science)
Gal, Yeong-Soon (Polymer Chemistry Laboratory, Kyungil University)
Lee, Jae Wook (Department of Chemistry, Dong-A University)
Jin, Sung-Ho (Department of Chemistry Education, Graduate Department of Chemical Materials, BK21 PLUS Team for Advanced Chemical Materials, and Institute for Plastic Information and Energy Materials, Pusan National University)
Publication Information
Bulletin of the Korean Chemical Society / v.35, no.5, 2014 , pp. 1485-1490 More about this Journal
Abstract
We have designed and developed a new ladder type tetrafused ${\pi}$-conjugated building block such as dihydroindolo[3,2-b]indole (DINI) and investigated its role as an electron rich unit. The photovoltaic properties of a new semiconducting ${\pi}$-conjugated polymer, poly[[5,10-bisoctyl-5,10-dihydroindolo[3,2-b]indole-[5,6- bis(octyloxy)-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole]], represented by PDINI-OBTC8 are described. The new polymer PDINI-OBTC8 was synthesized in donor-acceptor (D-A) fashion, where fused ${\pi}$-conjugated tetracyclic DINI, and 5,6-bis(octyloxy)-4,7-di(thiophen-2-yl) benzo[c][1,2,5]thiadiazole (OBTC8) were employed as electron rich (donor) and electron deficient (acceptor) moieties, respectively. The conventional bulk heterojunction (BHJ) device structure ITO/PEDOT:PSS/PDINI-OBTC8:PCB71M/LiF/Al was utilized to fabricate polymer solar cells (PSCs), which comprises the blend of PDINI-OBTC8 and [6,6]-phenyl-$C_{71}$-butyric acid methyl ester ($PC_{71}BM$) in BHJ network. A BHJ PSC that contain PDINI-OBTC8 delivered power conversion efficiency (PCE) value of 1.68% with 1 vol% of 1,8-diidooctane (DIO) under the illumination of A.M 1.5G 100 $mW/cm^2$.
Keywords
Fused ${\pi}$-conjugated polymer; Dihydroindolo[3,2-b]indole; Low band gap polymer; Bulk heterojunction polymer solar cells;
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