NaI Doping Effect on Photophysical Properties of Organic-Lead-Halide Perovskite Thin Films by Using Solution Process

Figure 2

The energy dispersive X-ray spectroscopy (EDS) of films with Sample+0 M (a), Sample+0.75 M (b), Sample+0.9 M (c), and Sample+1.2 M (d) (the blue ellipse area is the peak position of Na⁺).

(a)

(b)

(c)

(d)