Replication Data for: The Physics of Interlayer Exciton Delocalization in Ruddlesden Popper Lead Halide Perovskites

Abstract: Two-dimensional (2D) lead halide Ruddlesden-Popper perovskites (RPP) recently emerged as a prospective material system for optoelectronic applications. Their self-assembled multi quantum-well structure gives rise to the novel inter-well energy funnelling phenomenon, which is of broad interests for photovoltaics, light-emission applications and in emerging technologies (e.g., spintronics). Herein, we developed a realistic finite quantum-well superlattice model that corroborates the hypothesis of exciton delocalization across different quantum-wells in RPP. Such delocalization leads to a sub-50 fs coherent energy transfer between adjacent wells, with the efficiency depending on the RPP phase matching and the organic large cation barrier lengths. Our approach provides a coherent and comprehensive account for both steady-state and transient dynamical experimental results in RPPs. Importantly, these findings pave the way for a deeper understanding of the physics underpinning these systems crucial for establishing materials design-rules to realize efficient RPP-based devices.