Methylammonium is a chemical compound with the formula CH3NH3. It consists of a methyl group (CH3) attached to an ammonium ion (NH4+). This compound is often studied in the context of perovskite solar cells, where it serves as a cation in hybrid organic-inorganic materials, contributing to their unique properties. Methylammonium is typically found in the form of methylammonium halides, which are used in various applications, including photovoltaics and semiconductors. Its ability to form stable structures with other materials makes it an important component in the development of advanced technologies.