Fig. 4: Growth of 1D morphological MHP by hot-injection methods.

a Scheme showing the synthesis of Cs2SnI6 and samples exposed to UV light. b-f TEM images of Cs2SnI6. g Histogram showing the particle size distribution corresponding to Fig. 4b. h–j Histograms showing the diameter-length ratios for the samples in Fig. 4c–e. Reproduced with permission from ref. 58. Copyright 2016, American Chemical Society.