| 초록 |
Newly designed 2H-benzimidazole derivatives which have solubility groups at 2-position have been synthesized and incorporated into two highly soluble carbazole based alternating copolymers, poly[2,7-(9-(1′-octylnonyl)-9H-carbazole)-alt-5,5-(4′,7′-di(thien-2-yl)-2H-benzimidazole-2′-spirocyclohexane)] (PCDTCHBI) and poly[2,7-(9-(1′-octylnonyl)-9H-carbazole)-alt-5,5-(4′,7′-di(thien- 2-yl)-2H-benzimidazole-2′-spiro-4-((2″′-ethylhexyl)oxy)-cyclohexane)] (PCDTEHOCHBI) for photovoltaic application. These alternating copolymers show low-band gap properties caused by internal charge transfer from an electron-rich unit to an electron deficient moiety The power conversion efficiencies of PCDTCHBI and PCDTEHOCHBI blended with [6,6]phenyl-C71- butyric acid methyl ester (PC71BM) are 1.03 and 1.15%, respectively. |
