Synergetic Enhancement of Device Efficiency in Poly(3-hexylthiophene-2,5-diyl)/[6,6]-phenyl C₆₁ Butyric Acid Methyl Ester Bulk Heterojunction Solar Cells by Glycerol Addition in the Active Layer

Figure 3

Optical microscope images, scale 100 μm: (a) pristine PC₆₀BM layer unannealed, (b) pristine PC₆₀BM layer annealed, (c) P3HT:PC₆₀BM layer with 30 vol% glycerol additive unannealed, and (d) P3HT:PC₆₀BM layer with 30 vol% glycerol additive annealed.

(a)

(b)

(c)

(d)