PTFE syringe filter and added directly to a crystallizing dish on a hot plate. The hot plate was set to 80 °C to grow the MAPbBr3 and 50 °C to grow the MAPbCl3. Once the growth was complete (~5-8 hours) the crystals were removed from the solution, dried with a Kim wipe, and placed under vacuum (~80 to ~100 mTorr) for ~24 to ~48 hours at room temp prior to pulverization. Methodology for growth of large single crystals (Figure ) and subsequent polishing will be published elsewhere.