Spatial dependence of charge photogeneration and transport in an ordered, phase-separated liquid crystalline organic semiconductor

Bulk heterojunction organic photovoltaic cells depend on charge and exciton physics within, and between, small regions of organic semiconductors. To probe the physics of charge generation and transport in these geometries, we have fabricated patterned, phase-separated mixtures of liquid crystalline (LC) organic semiconductors and photopolymerized polymers. To characterize transport in the LC regions, we have developed ``scanning time-of-flight microscopy'' (STOFm), whereby spatially resolved TOF and polarized microscopy data are acquired in parallel. We will discuss the technique, as well as our results on efficiency of charge generation, mobility, and trapping in these confined geometries.