Heterocyclic-based photoactive materials

This chapter starts with an overview of the light–matter interaction models needed for the comprehension of compounds’ photochemistry and photophysics. The second section is dedicated to heterocyclic photoactive compounds (three-membered and larger ring systems), discussed in terms of their synthetic methods and photochemical properties, which are useful characteristics providing the understanding of their reactivity. The final section describes the main applications of promising photoactive compounds with a focus on conjugated heterocyclic backbones for efficient organic photovoltaics.