Exciton Localization and Trap-Assisted Recombination Govern Wavelength-Selective Photodetection in Lead-Free Cs 4 CuSb 2 Cl 12 Double Perovskite Nanocrystals

Layered two-dimensional halide double perovskites are often considered promising lead-free semiconductors because of their low bandgaps and strong optical absorption. Despite these properties, their use in high-performance broadband optoelectronic devices...