Abstract

This minireview surveys biexciton signatures in Ruddlesden–Popper metal halides and argues that two-dimensional coherent spectroscopy, especially two-quantum multidimensional techniques, provides the most reliable route to identifying biexciton states and extracting binding energies. It compares linear and nonlinear spectroscopies, discusses exciton–exciton annihilation and excitation-induced dephasing, and highlights how dimensionality, dielectric confinement, and composition shape multi-exciton physics in quantum-well derivatives of metal-halide perovskites.

Abstract

This minireview surveys biexciton signatures in Ruddlesden–Popper metal halides and argues that two-dimensional coherent spectroscopy, especially two-quantum multidimensional techniques, provides the most reliable route to identifying biexciton states and extracting binding energies. It compares linear and nonlinear spectroscopies, discusses exciton–exciton annihilation and excitation-induced dephasing, and highlights how dimensionality, dielectric confinement, and composition shape multi-exciton physics in quantum-well derivatives of metal-halide perovskites.

Abstract

This minireview surveys biexciton signatures in Ruddlesden–Popper metal halides and argues that two-dimensional coherent spectroscopy, especially two-quantum multidimensional techniques, provides the most reliable route to identifying biexciton states and extracting binding energies. It compares linear and nonlinear spectroscopies, discusses exciton–exciton annihilation and excitation-induced dephasing, and highlights how dimensionality, dielectric confinement, and composition shape multi-exciton physics in quantum-well derivatives of metal-halide perovskites.

Abstract

This minireview surveys biexciton signatures in Ruddlesden–Popper metal halides and argues that two-dimensional coherent spectroscopy, especially two-quantum multidimensional techniques, provides the most reliable route to identifying biexciton states and extracting binding energies. It compares linear and nonlinear spectroscopies, discusses exciton–exciton annihilation and excitation-induced dephasing, and highlights how dimensionality, dielectric confinement, and composition shape multi-exciton physics in quantum-well derivatives of metal-halide perovskites.