Syntheses and characterization of carbazole based new low-band gap copolymers containing highly soluble benzimidazole derivatives for solar cell application
作者:Jaehong Kim、Sung Heum Park、Jinwoo Kim、Shinuk Cho、Youngeup Jin、Joo Young Shim、Hyunmin Shin、Sooncheol Kwon、Il Kim、Kwanghee Lee、Alan J. Heeger、Hongsuk Suh
DOI:10.1002/pola.24435
日期:2011.1.15
These alternating copolymers show low‐band gap properties caused by internal charge transfer from an electron‐rich unit to an electron‐deficient moiety. HOMO and LUMO levels are –5.53 and –3.86 eV for PCDTCHBI, and –5.49 and –3.84 eV for PCDTEHOCHBI, respectively. Optical band gaps of PCDTCHBI and PCDTEHOCHBI are 1.67 and 1.65 eV, respectively. The new carbazole based the 2H‐benzimidazole polymers show
合成了新设计的在2位具有可溶性基团的2 H-苯并咪唑衍生物,并将其掺入两种高溶解性咔唑基交替共聚物中,即聚[2,7-(9-(1'-辛基壬基)-9 H-咔唑) - ALT -5,5-(4',7'-二(噻吩-2-基)-2- ħ -苯并咪唑-2'-螺环己烷)](PCDTCHBI)和聚[2,7-(9-(1' -辛基壬基)-9 H-咔唑)alt- 5,5-(4′,7′-二(噻吩-2-基)-2 H苯并咪唑-2'-螺-4-'(((2'''-乙基己基)氧基)-环己烷)](PCDTEHOCHBI)用于光伏应用。这些交替共聚物显示出低带隙性质,这是由于内部电荷从富电子单元转移到缺电子部分所引起的。对于PCDTCHBI,HOMO和LUMO电平分别为–5.53和–3.86 eV,对于PCDTEHOCHBI,分别为–5.49和–3.84 eV。PCDTCHBI和PCDTEHOCHBI的光学带隙分别为1.67和1.65