CH₃NH₃Cl, commonly known as methylammonium chloride, is an organic compound composed of carbon, hydrogen, nitrogen, and chlorine. It appears as a white crystalline solid and is soluble in water. This compound is often used in various chemical reactions and as a precursor in the synthesis of other organic materials. Methylammonium chloride is particularly significant in the field of perovskite solar cells, where it serves as a key component in the formation of methylammonium lead halide structures. These structures are known for their high efficiency in converting sunlight into electricity, making them a focus of research in renewable energy technologies.