Fig. 1: Structure and basic optical properties of the integrated dual-cavity perovskite laser.
From: Electrically driven lasing from a dual-cavity perovskite device
a, Schematic of the device. b, A cross-sectional schematic of the device structure (left), and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images of a device (layer thicknesses unoptimized) (right). See Methods for detailed fabrication processes. c, A top-view SEM image of an FAPbI3 single crystal used in microcavity II. d, A schematic top view of the device. The Au and ITO electrodes are the anode and cathode, respectively. e, Reflection spectra of DBR1 in microcavity I and DBR2 in microcavity II, together with the EL spectrum of the Cs0.5FA0.5PbI2Br microcavity PeLED and the PL spectrum of the FAPbI3 single crystal. Refl., refelction; a.u., arbitrary units. Scale bars, 400 nm (b, top right); 200 nm (b, bottom right); 10 μm (c).
