| 초록 |
A series of new terpolymers composed of two electron-rich units, thienyl-substituted benzo[1,2-b:4,5-b’]dithiophene (BDT) and dithieno[3,2-b:2’,3’-d]silole (DTS), and one electron-deficient unit, thieno[3,4-c]pyrrole-4,6-dione (TPD) was synthesized with different ratio of DTS unit to BDT unit (25%, 50%, and 75% DTS). The compositional effect of the terpolymers on their physicochemical properties and device performances were investigated. It was found that the different compositions of BDT and DTS units had a significant effect on the electrochemical properties of the terpolymers. PTPD-BDT75-DTS25 showed excellent light harvesting ability, high charge carrier mobility, and low-lying HOMO energy level. In addition, the photovoltaic performance of the terpolymer based BHJ PSCs was strongly influenced by the different composition. The inverted BHJ PSCs based on the PTPD-BDT75-DTS25 exhibited a Voc of 0.94 V, a Jsc of 10.83 mA/cm2, and a FF of 56.52%, resulting in a high PCE of 5.78%. |
