Mixed molecular orientations promote charge transport in bulk heterojunction solar cells

By systematically varying the molecular orientation of poly(3-hexylthiophene-2,5-diyl) (P3HT) in P3HT:fullerene bulk heterojunctions, we show that a mixed face-on and edge-on texture can be beneficial for out-of-plane charge flow in solution processed organic bulk heterojunction solar cells. These results implicate the need to balance in-plane and out-of-plane pathways for efficient charge percolation in bulk heterojunctions.

Automated summary

By varying the molecular orientation of the polymer in bulk heterojunctions, it has been found that a mixed texture can enhance out-of-plane charge flow in solution processed organic solar cells. This highlights the importance of balancing in-plane and out-of-plane pathways for efficient charge percolation in bulk heterojunctions.