Methylammonium iodide (MAI, CH 3 NH 3 I) was synthesized by reacting 12 mL of methylamine with 6 mL of hydroiodic acid at 0 °C for 2 hours in an ice bath while continuously stirring. While stirring, the prepared solution was heated at 50 °C to produce a white crystalline solid. The produced crystalline solid was washed 3 times with diethyl ether. Finally, white powder of MAI was generated, which was then dried in a vacuum oven overnight at 60 °C.