Abstract
In the last years, organic photovoltaics have moved from a lab curiosity to a commercially viable technology. In this chapter, we consider organic photovoltaics based on oligomers (“small molecules”) which are deposited by vacuum sublimation. While the physics of the small molecule materials is in many ways very similar to those of polymer organic materials, there are significant differences in materials synthesis, processing, and device concepts. We review a few classes of small molecule solar cell materials and discuss their properties in devices. We discuss device concepts for small molecule organic solar cells, in particular pin devices based on doped transport layers and cascade designs. We point out the points where devices can be improved and describe paths to higher efficiencies, including multi-junction devices which can be very well realized with small molecule organic semiconductors.
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