Fig. 4: Low temperature PL study to reveal the multiple halide compositions generated due to phase segregation. | Communications Materials

Fig. 4: Low temperature PL study to reveal the multiple halide compositions generated due to phase segregation.

From: Energy-band gradient structure originated from longitudinal phase segregation of mixed halide perovskite single crystal

Fig. 4

a Contour map showing the PL emission intensity in the temperature range of 10 ~ 230 K. b, c PL spectra at two representative temperatures of 25 K and 70 K and multi-peak fitting. The black line illustrates the raw profiles directly from the experiment and the yellow dashed lines on top of black lines are constructed from the deconvoluted profiles by summing up all the individual components. The close shape of black and yellow lines indicates good fit of these PL spectra. d Portion of emission peak 1, 2 and 3 at different temperature obtained by calculating the ratio of individual peak area over the full area of I-rich emission feature.

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