Thin Films: Mapping Spatially Resolved Charge Collection Probability within P3HT:PCBM Bulk Heterojunction Photovoltaics (Adv. Energy Mater. 2/2014)

In article 1300525, D. M. Nanditha M. Dissanayake and co‐workers show that unlike the behavior observed thicknesses typically used for devices (100 nm), electron‐limited behavior is seen for a thicker active layer (920 nm) due to phase segregation in poly(3‐hexythiophene‐2,5‐diyl):phenyl‐C61‐butyric acid methyl ester (P3HT:PCBM). The illustration shows prism‐coupled guidedmodes used for spatially selective excitation in a P3HT:PCBM photovoltaic, which are used to obtain high‐resolution profiles of charge‐collection probability in the photoactive layer.