I have prepare CH3NH3PbBr3 perovskite single crystal which size is 5mm in cubic shape. I have read many research articles on the same topic but still I could not understand the measurements of the single crystals of very small size (up to 3mm). Some articles have reported that they had used powder for single crystal study. But here I am confuse, with term powder of single crystal.

So please suggest me proper way to PL, Absorbance and TEM measurement.

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