NOVELTY - A dye sensitized solar cell (DSSC) has a semiconductor comprising a layer of particulate metal oxide and a dye adsorbed to the semiconductor. The semiconductor interface with the dye is formed by atomic layer deposition (ALD) of a semiconductor material on the particulate metal oxide. The metal of the particulate metal oxide is chosen from magnesium, calcium, strontium, barium, scandium, yttrium, lanthanum, titanium, hafnium, vanadium, tantalum, chromium, molybdenum, tungsten, iron, nickel, copper, indium, aluminum and gallium.    USE - Dye sensitized solar cell.    ADVANTAGE - The dye sensitized solar cell has excellent cell performance and stability.    DETAILED DESCRIPTION - A dye sensitized solar cell (DSSC) has a semiconductor comprising a layer of particulate metal oxide and a dye adsorbed to the semiconductor. The semiconductor interface with the dye is formed by atomic layer deposition (ALD) of a semiconductor material on the particulate metal oxide. The metal of the particulate metal oxide is chosen from magnesium, calcium, strontium, barium, scandium, yttrium, lanthanum, titanium, hafnium, vanadium, tantalum, chromium, molybdenum, tungsten, iron, nickel, copper, indium, aluminum and gallium. The particulate metal oxide comprises titanium oxide, niobium oxide, tungsten oxide, indium oxide, tin oxide, nickel oxide, strontium titanate and/or zirconium oxide. The dye sensitized solar cell further comprises optical electrode and electrolyte layer. The ALD layer is formed of metal oxide chosen from titanium oxide, niobium oxide, tungsten oxide, indium oxide, tin oxide, nickel oxide, zirconium oxide and zinc oxide. The optical electrode is transparent conducting oxide chosen from fluorine doped tin oxide (FTO) and indium doped tin oxide (ITO). The dye is chosen from anthocyanins, squarates, eosins, xanthines, cyanines, merocyanines, phthalocyanines, indolines, porphyrins, oligothiophenes, coumarins, perylenes and pyrroles. The dye is a metal complex containing metal atom or ion chosen from multivalent metals, preferably ruthenium transition metal complex, osmium transition metal complex or iron transition metal complex. The dye alternately comprises cis-bis(isothiocyanato)bis(2,2'-bipyridyl-4,4'-dicarboxylato)-ruthenium (II) (N3 dye), tris(isothiocyanato)-ruthenium (II)-2,2':6',2"-terpyridine-4,4',4"- tricarboxylic acid, cis-bis(isothiocyanato)bis(2,2'- bipyridyl-4,4'-dicarboxylato)-ruthenium(II)bis-tetrabutylammonium, cis-bis(isocyanato)(2,2'-bipyridyl-4,4'dicarboxylato)ruthenium(II), cis-bis(isothiocyanato)(2,2'-bipyridyl-4,4'-dicarboxylato)(2,2'-bipyridyl-4,4'-di-nonyl)ruthenium(II) (Z907 dye), tris(2,2'-bipyridyl-4,4'-dicarboxylato)ruthenium (II)dichloride, 5-((4-(4-(2,2-diphenylethenyl)phenyl)-1,2,3,3a,4,8b-hexahydrocyclopent(b)indol-7-yl)methylene)-2-(3-ethyl-4-oxo-2-thioxo-5-thiazolidinylidene)-4-oxo-3-thiazolidineacetic acid, 5-((4-(4-(2,2-diphenylethenyl)pheny)-1,2,3,3a,4,8b-hexahydrocyclopent(b)indol-7-yl)methylene)-2-(3-ethyl-4-oxo-2-thioxo-5-thiazolidinylidene)-4-oxo-3-thiazolidineacetic acid (D149 indoline dye). The electrolyte layer is in the form of liquid, gel, salt or solid electrolyte, or n-type and p-type transporting material. The electrolyte is iodide/iodine in solvent such as acetonitrile. An INDEPENDENT CLAIM is included for process for forming dye sensitized solar cell.