The influence of the optoelectronic properties of poly(3-alkylthiophenes) on the device parameters in flexible polymer solar cells

Photovoltaic devices were prepared on flexible PET-ITO foils on ambient conditions using P3HT/PCBM (1:3 wt.%) with ηAM1.5 = 1.54%, P3OT/PCBM (1:3 wt.%) with ηAM1.5 = 1.1% and P3DDT/PCBM (1:3 wt.%) with ηAM1.5 = 0.59% (A: 0.25 cm2, PIN = 100 mW/cm2). The serial and parallel resistance increases within the series P3HT:PCBM < P3OT:PCBM < P3DDT:PCBM cells, therefore the short-circuit current decreases and the open-circuit voltage increases in this order.