Quinoxaline-based Conjugated Polymers with Electron Accepting Chlorine Groups for Photovoltaic Cell Applications
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We designed and synthesized the new Quinoxaline-based D-A type conjugated polymers with the chlorine atom for photovoltaic cell applications. The D-A structure of the polymer backbone was constructed through the benzodithiophene (BDT) derivatives as electron-donating units and the chlorine substituted-quinoxaline as an electron-accepting unit. In addition, the chlorine atoms have been introduced at different numbers and positions into the quinoxaline units. After confirming the structural features, the electrochemical and optical properties were measured, and the photovoltaic properties using the Y6 acceptor were examined. The photovoltaic properties were investigated with a device composed of the typical inverted-type device with the general configuration of ITO/ZnO/Polymers: Y6/MoO3/Ag. As a result, this study can explain the correlation of the chlorine substituent in the quinoxaline structures with photovoltaic properties.