Brian C. O'Regan is an American chemist known for the co-invention of dye-sensitized solar cells (DSSC, DSC, SSC). He became a Research Lecturer at Imperial College London where he conducted research on photovoltaic cells and other applications of nano-structured oxide electronic materials during the year 2007.
Brian O'Regan is known for his pioneering work on the deposition of meso-porous oxides from colloidal solutions that ultimately led to the first high efficiency DSSC. He has also developed the first high efficiency non-aqueous electrolyte for DSSC and more recently has overturned the belief that water is poisonous to dye sensitisation by designing water based and water tolerant DSSC. He has invented TiO<sub>2</sub> electrodeposition from TiCl<sub>3</sub>, electrodeposition of CuSCB and non-aqueous electrodeposition of aligned mesoporous ZnO. He holds 5 patents and is the author of numerous research papers.