Abstract
Two D-A type conjugated polymers, in which the electron-donating benzodithiophene monomers are connected to the electron-accepting indolo-thiadiazoloquinoxaline (ITQ) monomers via a thiophene bridge, are synthesized under Stille coupling conditions. Once the reference PB-ITQ is prepared, one fluorine atom is incorporated into the ITQ unit of PB-ITQ to afford the additional target polymer PB-ITQF. An inverted-type device with the configuration of indium tin oxide (ITO)/ZnO/Polymer:PC71BM/MoO3/Ag is utilized to examine the photovoltaic properties of the two polymers. Owing to the positive contributions of fluorine atoms, all the photovoltaic parameters of the device based on PB-ITQF such as the short-circuit current density, open-circuit voltage, and fill factor are improved as compared with those of the device based on PB-ITQ. As a result, the highest PCE of 2.32% is achieved from the fullerene-based polymer solar cell based on PB-ITQF.
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