Fig. 2: Microstructure and composition of Ag-rich nanoprecipitates.

a Dark-field HRTEM image of Ag2.3Se-SPS140 °C/1 min film inserted with a FFT pattern. b, c HAADF-STEM images Ag2.3Se-SPS200 °C/5 min film and Ag2.3Se-SPS200 °C/30 min film. d Atomic fraction of Ag element revealed by EDS elemental line scan across a “bright” domain. e, f Dark-field HRTEM image of Ag2.3Se-SPS200 °C/5 min film and Ag2.3Se-SPS200 °C/30 min film inserted with the FFT patterns.