Quinoxaline-based Polymers with Strong Electron-Withdrawing Cyano groups for Photovoltaic Applications
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초록
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We have synthesized three D-A type quinoxaline-based conjugated polymers for organic photovoltaic cells (OPVs). To construct the D-A architecture, the electron-accepting di(m-hexyloxy) phenyl-substituted quinoxaline (m-HoDPQ) unit was linked to electron-donating 2-ethylhexyloxy benzodithiophene (BDT) unit. Furthermore, the strong electron-withdrawing cyano-group was incorporated into the m-HoDPQ unit. In addition, the combination of fluorinated-alkylthienyl substituted BDT unit yielded another target polymer. A typical inverted-type device with the configuration of ITO/ZnO/Polymers : Acceptor/MoO3/Ag was fabricated and examined. Therefore, this study can provide insights into the design and structure-property correlation of cyano-substituted quinoxaline-based polymers for organic photovoltaic cells.