Fig. 5: Morphology and phase segregation analysis. | Nature Energy

Fig. 5: Morphology and phase segregation analysis.

From: Large guanidinium cation mixed with methylammonium in lead iodide perovskites for 19% efficient solar cells

Fig. 5

a–d, Top-surface SEM images of four representative samples, including pure MAPbI3 (a), mixed MA1–x Gua x PbI3 with x = 0.14 (b), with x = 0.30 (c), and pure GuaPbI3 (d). Scale bars, 1 µm. e,f, Micro-PL wavelength peak shift map (e) and micro-Raman spectra (f) of the perovskite surface obtained for Gua contents equal to 0, 15, 25 and 75%. The traces are shifted vertically for clarity.

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