Abstract
As we move toward roll‐to‐roll processing of organic photovoltaics (OPVs), it is important to validate the process and the ink formulations. A poly[[9‐(1‐octylnonyl)‐9Hcarbazole‐2,7‐diyl]‐2,5‐thiophenediyl‐2,1,3‐benzothiadiazole‐4,7 diyl2,5thiophenediyl]:[6,6]‐phenyl C71 butyric acid methyl ester (PCDTBT:PC71BM)‐based OPV with an increase in power conversion efficiency (PCE) from 4.6% up to 5.4% by incorporating bis(tri‐hexylsiloxy) silicon phthalocyanine ((3HS)2‐SiPc) NIR absorbing ternary additives on indium tin oxide (ITO)/polyethyleneterapthalate (PET) flexible substrate with active area of 1 cm2 under simulated AM 1.5G one sun irradiation. Maximum PCE of the ternary OPVs was obtained with 5 wt% of (3HS)2‐SiPc added when processing the active layer by spin coating, whereas the addition of 10 wt% of (3HS)2‐SiPc is required for the maximization of PCE when processing the films by blade coating. The importance of processing conditions when optimizing the concentration of ternary additives in bulk heterojunction (BHJ) OPVs is demonstrated.
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