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송관욱,최민희,이장용,문두경 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
To increase open-circuit voltage (Voc), we introduced thieno[3,4-c]pyrrole-4,6-dione (TPD) moietieswhich has unsubstituted and substituted thiophene spacers. Poly(2,7-carbazole-alt-TPD) derivatives,namely PCDTTPD and PCDHTTPD, were copolymerized with 2,7-carbazole through Suzuki couplingreaction. An increase in the molecular weight and a decrease in the highest occupied molecular orbital(HOMO) energy level are confirmed. Steric hindrance caused by rotational dynamics was measured bydensity functional theory calculation. When the resulting polymers, PCDHTTPD, were used to fabricate abulk heterojunction device with PC71BM, Voc increased to 0.84 V, whereas the short-circuit currentdensity (Jsc) decreased to 0.93 mA/cm2 because of poor charge dissociation.
송관욱,최민희,한명희,문두경 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
We reported on two donor polymers containing thieno[3,4-c]pyrrole-4,6-dione(TPD) derivatives aselectron withdrawing units for organic photovoltaics (OPVs). To control molecular weight and solubilityof polymers, hexyl side chains are inserted to thiophene spacers. Due to the electron donatingcharacteristic of hexyl side chains, highest occupied molecular orbital (HOMO) energy level of polymer isdecreased as 0.18 eV, whereas the open circuit voltage is increased to 1.08 V. When bulk heterojunctiondevices were fabricated, the best PCE value of 0.360% (VOC = 0.89 V, JSC = 1.2 mA/cm2, FF = 36.3%) under100 mW/cm2 irradiation.