Effects of metal halide perovskite composition on exciton binding energy

Metal halide perovskites (MHPs) are a novel series of semiconductors with strong optoelectronic properties and photovoltaic applications. 2D MHPs offer a deep look into the structural properties which affect optoelectronic properties such as the exciton binding energy (E_b) and the band gap (E_g), which has applications in band gap engineering materials for solar cells and light-emitting diodes. Using absorption and electroabsorption techniques, we can accurately measure their E_b. Then, by modelling the excitons using a 2D system, we can predict the effects that altering the composition of the MHPs has on these properties. We show that there is a correlation between structural properties, such as well and barrier length, and E_b.