fig2

Figure 2. Properties of TE-based MHP films according to ratio of precursor and evaporating rate. (A) Various TE methods for the formation of MHP thin films; (B) SEM images of the MHP films fabricated by TE with varied Cs/Pb ratio^[59]. Copyright 2019 AIP publishing; (C) The EQE data of deposited MHP films depending on the different ratio of Cs₄PbBr₆; (D) PLQY and EQE, and conductivity data according to the ratio of Cs₄PbBr₆ phase^[60]. Copyright 2019 John Wiley & Sons; (E) SEM image of the CsPbBr₃ films with different rate of TE^[33]. Copyright 2018 John Wiley & Sons; (F) The PL spectra and (G) EL spectra, and (H) luminance data of thermal-evaporated CsPbBr₃ from 0.4 to 2.4 Å·s^-1[63]. Copyright 2020 American Chemical Society. TE: Thermal evaporation; MHP: metal halide perovskite; SEM: scanning electron microscopy; EQE: external quantum efficiency; PLQY: photoluminescence quantum yield; PL: photoluminescence; EL: electroluminescence.