Fig. 3
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(a) Heat map of the photoluminescence (PL) measurement of the planar perovskite reference film. After 25 seconds of spin-coating of the perovskite precursor solution, the antisolvent-drop was added. (b) Example PL spectrum taken at 47 seconds of the map shown in part (a) (dashed line) to visualize the parameters PL peak position, full width at half maximum (FWHM) and intensity.
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