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 6

Optical microscope images, scale 100 μm: (a) ITOPH500P3HT:PC₆₀BM (pristine) unannealed, (b) ITOPH500P3HT:PC₆₀BM (pristine) annealed, (c) ITOPH500P3HT:PC₆₀BM layer (with 30 vol% glycerol additive) unannealed, and (d) ITOPH500P3HT:PC₆₀BM (with glycerol 30 vol% additive) annealed.

(a)

(b)

(c)

(d)