After aging, colors of CH3NH3PbI3 and HC(NH2)2PbI3 precursor solutions with gamma-butyrolactone as solvent tend to become darker. What is the reason or chemistry related to this phenomenon?
Joseph S Merola
How was aging carried out? These Pb compounds are photo sensitive and could decompose to elemental Pb on standing in light.
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Boyan Iliev
It is decomposition of your products. On one side, all amines darken under light and heat, on the other side your iodide is light sensitive and can turn to iodine, small amounts of both are very strong chromophores.
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