A Study on Synthesis of Novel Conjugated Polymers by Using Benzodithiophene and Fluorinated Phenazine for PSCs
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초록
내용
The novel low-bandgap alternating copolymers (PBDT-DT-DoDFPz and PBDT-DT-DHDFPz) based on difluoro-phenazine were synthesized by stille coupling reaction to investigate the effect of alkyl side chain. Absorption spectra of polymers in film state show the bathochromic shift (about 16 ~ 35nm at maximum peak) compared to in solution. PBDT-DT-DoDFPz was red-shifted than PBDT-DT-DHDFPz. The reason is that the polymer with a linear alkyl side chain was better packed in the film than the polymer with a branched alkyl side chain. A TGA (thermogravimetric analysis) figure showed that the 5% weight-loss temperature (Td) of these polymers were over 330℃ under an inert nitrogen. The AFM (Atomic Force Microscopy) images showed that the domain of PBDT-DT-DoDFPz is smaller and more homogeneous than PBDT-DT-DHDFPz. As a result, the polymer PBDT-DT-DoDFPz achieved 3.41% of PCE (power conversion efficiency) and 0.66V of open-circuit voltage (V¬oc).