NOVELTY - In photoelectrochemical solar cells with a dye for converting photons into electrons and means of producing a useful electric current from the electrons, the dye(s) used are selected from 37 dyes, e.g. dyes of the coumarin and rhodamine type.    USE - The cells are useful for generating current for operating e.g. electronic devices, electric motors etc.    ADVANTAGE - Dyes used in these cells need to be stable and have good efficiency for converting electrons and great adsorption on the semiconductor layer. Ruthenium complexes used in such cells are very costly and not (readily) available. They are also hardly soluble in ethanol and unstable in solution on the slightest exposure to light and become stable only when adsorbed on titanium dioxide and surrounded by the redox mediator. The dyes used in the present cells are cheap, readily available and highly efficient and are adsorbed well. They can be used with nitrogen-pumped dye lasers and are readily soluble in ethanol or dioxane. They are stable in full sunlight for 2 years or more. As they are not sensitive to light, processing is very easy. They are generally used without metal complex compounds.    DETAILED DESCRIPTION - In photoelectrochemical solar cells with a dye for converting photons into electrons and means of producing a useful electric current from the electrons, the dye(s) used are selected from 37 dyes, comprising Coumarin 6, Coumarin 6H, Coumarin 7, Coumarin 30, Coumarin 47, Coumarin 151, Coumarin 152A, Coumarin 47, Coumarin 151, Coumarin 152A, Coumarin 314, Coumarin 334, Coumarin 466, Coumarin 500, Coumarin 510, Coumarin 522; Uranin; Fluorol 7GA; Pyridine 1; DCM; bis-MSB; POPOP; TBS, alpha-NPO, furan 2, PBBO, DPS, Stilbene 1; Sulforhodamine 101, Sulforhodamine B; Rhodamine 19, Rhodamine 101, Rhodamine 110, Rhodamine 700; Styryl 7, Styryl 9M; 5-phenyl-2-(4-pyridyl)oxazole; Oxazine 170 perchlorate; 1,1',3,3,3',3'-hexamethylindodicarbocyanine iodide; and N,N'-ditridecyl-3,4,9,10-perylenetetracarbodiimide. Full details of these dyes are given in the SPECIFIC COMPOUNDS Field.