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Dinda Fariesta Nugraha,손동환,Ratri Puspita Wardani,이석우,WHANG PATRICK DONG,김주현,Dong Wook Chang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
In this study, strategic structural modifications of quinoxaline-based polymers were performed toimprove their photovoltaic properties. First, an indacenodithiophene (IDT) unit was connected tomethoxy-substituted quinoxaline via a thiophene linker to produce the reference polymer, PIDTQxTM. The electron-accepting quinoxaline unit was surrounded by the electron-donating IDT and methoxygroup in its horizontal and vertical directions, respectively, creating a beneficial two-dimensionalconfiguration. Subsequently, two promising attempts to position the electron-pulling fluorine atom onthe quinoxaline acceptor and replace IDT with a more extended indacenodithieno[3,2-b]thiophene unitwere sequentially performed to afford the objective polymers PIDT-FQxTM and PIDTT-FQxTM, respectively. Because of the positive and synergistic effects, the photovoltaic characteristics of the polymersin an inverted-type non-fullerene polymer solar cell gradually enhanced in the order of PIDT-QxTM,PIDT-FQxTM, and PIDTT-FQxTM, with power conversion efficiencies of 6.50%, 7.82%, and 8.51%, respectively. The best performance from the device with PIDTT-FQxTM is primarily ascribed to the superiorshort-circuit current density to that of the others.
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