Ternary molecules blend organic bulk heterojunction solar cell

The ternary molecules blend organic photovoltaic cell using poly(3 hexylthiophene) (P3HT), poly[[4,8-bis[(2-ethyhexyl)oxy] benzo(1,2-b:4,5-b′)dithiophene-2,6-diyl][3-fluoro-2-[(2 ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were investigated. The performance of the ternary blend was compared with two binary molecules based photoactive layers such as P3HT:PCBM and PTB7:PCBM. It was found that the ternary molecules photovoltaic cell performs better than those with P3HT:PCBM composition. The optical and morphological properties of the ternary blend active layers were investigated, and the results suggest that better photon harvesting medium can be achieved by blending two donor molecules.