Extended Data Fig. 7: Characterizations of tin perovskite films and LEDs prepared from precursor solutions with a single additive.
From: Spin coating epitaxial heterodimensional tin perovskites for light-emitting diodes
a-b, Cross-sectional and top-view SEM images of the SnF2 (a) or Trp (b) based tin perovskite films. All scale bars represent 1 μm. c, Excitation-intensity-dependent PLQEs. d, Dependence of current density and radiance on voltage. e, EQE curves plotted against current density. f-g, In-situ absorption (f) and PL (g) spectra of the tin perovskite films based on Trp or SnF2 alone, which were measured during the spin-coating process. h, Absorption and back-side-excited PL spectra of the corresponding films measured during the annealing process.
