| Abstract | As we move toward roll-to-roll processing of organic photovoltaics (OPVs), it isimportant to validate the process and the ink formulations. A poly[[9-(1-octyl-nonyl)-9Hcarbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7diyl2,5thiophenediyl]:[6,6]-phenyl C71 butyric acid methyl ester (PCDTBT:PC₇₁BM)-based OPV with an increase in power conversion efficiency (PCE) from4.6% up to 5.4% by incorporating bis(tri-hexylsiloxy) silicon phthalocyanine((3HS)2-SiPc) NIR absorbing ternary additives on indium tin oxide (ITO)/poly-ethyleneterapthalate (PET)flexible substrate with active area of 1 cm² undersimulated AM 1.5G one sun irradiation. Maximum PCE of the ternary OPVs wasobtained with 5 wt% of (3HS)₂-SiPc added when processing the active layer byspin coating, whereas the addition of 10 wt% of (3HS)2-SiPc is required for themaximization of PCE when processing thefilms by blade coating. The importanceof processing conditions when optimizing the concentration of ternary additivesin bulk heterojunction (BHJ) OPVs is demonstrated. |
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