Synthesis and Characterization of a Low-Bandgap Polymer Incorporating N-Octyl-2,7-Dithia-5-Azacyclopenta[α]pentalene-4,6-Dione as an Electron-withdrawing Unit
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초록
내용
In this study, we successfully synthesized a low-bandgap polymer, PBDTDTPD. This polymer consists of dialkylthiophenyl benzodithiophene (BDT) donor units and N-octyl-2,7-dithia-5-aza-cyclopenta[a]pentalene-4,6-dione (DTPD) acceptor units. The synthesized polymer is thermally stable and dissolves well in common organic solvents. The PBDTDTPD:PC71BM (1:1) blend film exhibited a power conversion efficiency of 3.18% and an open-circuit voltage of 0.75 V. This study demonstrates that the DTPD moiety is a promising building block for developing low-bandgap materials that can absorb a broad spectrum of light and possess high thermal stability.