Journal of Industrial and Engineering Chemistry, Vol.73, 192-197, May, 2019
Synthesis of quinoxaline-based polymers with multiple electron-withdrawing groups for polymer solar cells
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Two quinoxaline-based conjugated polymers with multiple electron-withdrawing moieties were synthesized by the Stille coupling reaction for polymer solar cells (PSCs). For the construction of a typical donor-π-acceptor structure, the electron-donating indacenodithiophene (IDT) and indacenodithieno[3,2-b]thiophene (IDTT) were linked to the electron-withdrawing quinoxaline (DPQCF3F) that contained trifluoromethyl and fluorine units via a thiophene bridge to produce PIDT-Qx and PIDTT-Qx, respectively. Owing to the significant contribution of the DPQCF3F unit in the polymer backbone, Voc of the inverted-type PSCs was increased up to 0.92 V. In addition, the replacement of two thiophenes of IDT to two thieno[3,2-b] thiophene units of IDTT in the quinoxaline-based polymer backbone can efficiently improved the light absroption and charge carrier mobility of the resultant polymer. Therefore, a higher PCE of 4.54% was achieved from the device based on PIDTT-Qx with a short circuit current density of 9.30 mA/cm2, an open-circuit voltage of 0.92 V, and a fill factor of 53%, compared with the device based on PIDT-Qx (2.83%).
Keywords:Quinoxaline;Electron-withdrawing;Polymer solar cell;Indacenodithiophene;Indacenodithieno[3,2-b]thiophene
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