Pentacene: PTCDI-C_(13)H_(27) molecular blends efficiently harvest light for solar cell applications

摘要

Solar cells exhibiting efficient photon harvesting are built from molecular blends of pentacene: PTCDI-C_(13)H_(27). Absorption of the composition spans the whole visible spectrum with an onset at 730 nm. External quantum efficiency approaches unity at the peak absorption of pentacene, A 2.0% power conversion efficiency is obtained under 80 mW cm~(-2) AM 1.5 illumination, with 8.6 mA cm~(-2) short-circuit current. The comparison with bilayer devices suggests directions of improvement in conversion efficiency such as controlled growth of the blend layers.