Used in organic synthesis as a building block for conjugated polymers and donor-acceptor materials in organic electronics. Its selenium-containing core enhances electron-rich character, making it suitable for applications in organic solar cells and field-effect transistors. The aldehyde functional groups allow for easy extension through condensation reactions, enabling the formation of Schiff bases or incorporation into larger π-conjugated systems. Also explored in the development of conductive polymers and redox-active materials due to the unique electronic properties of the selenophene ring.