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http://dx.doi.org/10.5012/bkcs.2014.35.4.1098

A Novel Donor-Acceptor-Acceptor-Acceptor Polymer Containing Benzodithiophene and Benzimidazole-Benzothiadiazole-Benzimidazole for PSCs  

Tamilavan, Vellaiappillai (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University)
Song, Myungkwan (Advanced Functional Thin Films Department, Korea Institute of Materials Science)
Agneeswari, Rajalingam (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University)
Kim, Sangjun (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University)
Hyun, Myung Ho (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University)
Publication Information
Bulletin of the Korean Chemical Society / v.35, no.4, 2014 , pp. 1098-1104 More about this Journal
Abstract
New electron deficient acceptor-acceptor-acceptor type of monomer unit composed of weak electron accepting benzimidazole and relatively strong electron accepting benzothiadiazole derivatives namely 4,7-bis(6-bromo-1-(2-ethylhexyl)-1H-benzo[d]imidazol-2-yl)benzo[c][1,2,5]thiadiazole (BBB) was synthesized. The Stille polycondensation of the newly synthesized BBB monomer with electron donating 2,6-bis(trimethyltin)-4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b']dithiophene (BDT) afforded donor-acceptor-acceptor-acceptor type of polymer namely 2,6-(4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b']dithiophene)-alt-4,7-bis(1-(2-ethylhexyl)-1H-benzo[d]imidazol-2-yl)benzo[c][1,2,5]thiadiazole (PBDTBBB). The opto-electrical studies revealed that the absorption band of PBDTBBB appeared in the range of 300 nm-525 nm and its highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels were positioned at -5.18 eV and -2.84 eV, respectively. The power conversion efficiency (PCE) of the polymer solar cell (PSC) prepared from PBDTBBB:PC71BM (1:2 wt %) blend was 1.90%.
Keywords
Donor-acceptor polymer; Benzodithiophene; Benzimidazole; Benzothiadiazole;
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