Exploring the roles of morphology and lead halide precursors in hybrid perovskite luminescent solar concentrators*

Hybrid metal-halide perovskite thin films have recently emerged as highly suitable candidates for broadband luminescent solar concentrators (LSCs) due to their broad absorption, large Stokes shift, and high quantum yield, but device design remains yet to be optimized. We examine the correlation between film thickness, lead halide source utilized in the precursors, morphology, and optical efficiency of planar perovskite LSCs. After synthesizing and testing sixteen different types of PVSK samples, we report a maximum optical efficiency of 34.7{\%}, which is close to the highest value reported in any type of LSC to date. Correlating scanning electron microscopy with spatially-resolved photoluminescence measurements and 3D Monte Carlo simulations, we accurately estimate self-absorption, surface losses, and scalability, providing a route toward optimizing thin film PVSK materials for these and other optoelectronic and photovoltaic applications.