Simulating the Electroabsorption Spectrum of 2D Perovskite Multiple Quantum Wells*

Electroabsorption, i.e. the difference in a material's absorption spectrum with and without an applied electric field, was the most significant technique to advance our understanding of excited states in GaAs-based multiple quantum wells in the 1980s. Today research efforts are focused on a new class of multiple quantum wells, namely 2D perovskite multiple quantum wells. However, in comparison to GaAs-based quantum wells, electroabsorption studies on 2D perovskites have been sparse and contradictory. This work aims to bridge the gap between 2D perovskite electroabsorption spectral features and our theoretical understanding of them by implementing the theory that was successful for GaAs-based multiple quantum wells, but in a regime suitable for 2D perovskites. We find a high level of agreement between theory and experiment which allow for a deepened understanding of the exciton's Stark shift and the continuum wavefunction leaking into the forbidden gap according to the high-field Franz-Keldysh effect.