Zhengyuan Qin

TL;DR: Lin et al. as discussed by the authors used metallic tin to prevent oxidation in mixed Pb-Sn narrowbandgap perovskites to reduce the Sn4+ (an oxidation product of Sn2+) to Sn2+ via a comproportionation reaction.

TL;DR: An ammonium-cation-passivated Pb-Sn perovskites with long diffusion lengths are developed, enabling subcells having an absorber thickness of ~1.2 μm, and a certified efficiency of 26.4% in all-perovskite tandem solar cells is reported, exceeding that of the best-performing single-junction perovSKite solar cells.

TL;DR: Two-dimensional electronic spectroscopy is used to resonantly probe the interplay between near-band-edge transitions during the buildup of optical gain in CsPbBr3 NCs and finds compelling evidence to conclude that optical gain is generated through stimulated emission from strongly interacting biexcitons.

TL;DR: This work uses polarization-dependent two-dimensional electronic spectroscopy to quantify the excitation energy-dependent biexciton binding energy at cryogenic temperatures and finds the spectral line width for the exciton-biexciton transition is much broader than that for the ground state to exciton transition, suggesting weakly correlated broadening between these transitions.

TL;DR: In this paper, the authors presented a novel and facile approach of combining state-of-the-art light absorption and electric transport properties with ferroelectricity by the incorporation of room temperature 1D/3D mixed OIHP with 3D organic-inorganic hybrid perovskite.