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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?
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When I was making CH3NH3SnI3 solution, equimolar of SnI2 and CH3NH3I were dissolved in dimethylformamide to form 40 wt% solution. But the solution was dark and not transparent instead of being...
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