Fig. 1. (a) XRD pattern and (b) SEM image of CH3NH3PbBr3 monocrystal film

Fig. 2. (a) TEM image of Au NPs; (b) cross-section SEM image of quartz /PEDOT∶PSS (with Au NPs); (c) absorption spectra of Au NPs solution and CH3NH3PbBr3 film, and emission spectrum of CH3NH3PbBr3 film [inset of Fig. 2(c) is fluorescence emission photograph of CH3NH3PbBr3 film under ultraviolet lamp irradiation]

Fig. 3. (a) PL spectra, (b) absorption spectra and (c) transient fluorescence spectra of quartz/PEDOT∶PSS/CH3NH3PbBr3 (with or without Au NPs)

Fig. 4. Theoretical simulation results of (a) near-field and (b) far-field surface plasmons of Au NPs

Table 1. Lifetime fitting parameters of quartz/PEDOT∶PSS/CH3NH3PbBr3 with or without Au NPs