| 초록 |
A planar D-A type conjugated copolymer PTBT, which consists of alternating thiophene and alkoxy substituted benzothiadiazole, was synthesized by stille polycondensation. Our polymer is designed with two alkoxy chains which make the polymer soluble in organic solvents on the benzothiadiazole group resulting in the enhanced planarity and rigidity of the polymer. Moreover, a HOMO level was not increased because the HOMO is mainly related to the electron-rich moiety in the polymeric structure. The number-average molecular weight (Mn) was 30,000 g/mol by using gel permeation chromatography and optical band gap was 1.74 eV. The photovoltaic device characteristics will be discussed in detail. |
