NOVELTY - Dye-sensitized photochemical solar cell comprises dyes (A) including anthraquinone compounds (I), benzo(rst)phenanthro(10,1,2-cde)pentaphene-9,18-dione compounds (II), benzo(de)anthracen-7-one compounds (III), 3-methyl-3H-naphtho(1,2,3-de)quinoline-2,7-dione compounds (IV), 1-methyl-anthraquinone compounds (V) or 1,2,3,4,5,6,8,13-octahydroxy-10,11-dimethyl-phenanthro(1,10,9,8-opqra)perylene-7,14-dione (VI).    USE - (I)-(VI) are useful as a photosensitizer dye in a metal oxide layer of a photovoltaic cell (claimed).    ADVANTAGE - The dyes coated on titanium dioxide films renders the device effective in the conversion of visible light to electrical energy. (I) can attain higher solar conversion efficiencies than a cell based on silicon. (I) has a higher open circuit voltage than the silicon solar cell.    DETAILED DESCRIPTION - Dye-sensitized photochemical solar cell comprises dyes (A) including anthraquinone compounds of formula (I), benzo(rst)phenanthro(10,1,2-cde)pentaphene-9,18-dione compounds of formula (II), benzo(de)anthracen-7-one compounds of formula (III), 3-methyl-3H-naphtho(1,2,3-de)quinoline-2,7-dione compounds of formula (IV), 1-methyl-anthraquinone compounds of formula (V) or 1,2,3,4,5,6,8,13-octahydroxy-10,11-dimethyl-phenanthro(1,10,9,8-opqra)perylene-7,14-dione (VI).    R1 = H, -NH2, -SO3H, -SH, 1-8C alkyl, -OH, -COOH, halo, -NH-1-4C alkyl, -NH(CH2)1-2COOH, -NHCOR3, -NHOH, -NHCH2(CH2)1-2OH, -N(1-4C alkyl)2, substituted phenyl group of formula (a1), -O-1-4C alkyl, -OCH2(CH2)1-2-COOH or -OCH2(CH2)1-3-OH, and each group R2 has a significance of R1, independent of R1;    R3 = halo, 1-4C alkyl, -COOH, NH2, OH or H;    A = -NH- or -O-;    R10 = H, -NH2, -OH, SH, -CO2R12, 1-8C alkyl, -(CH2)1-2-CO2R12, -NHR12, -NR12, -OR12 or -SR12;    R12 = H or 1-8C alkyl; and    m = 0-1.    Provided that at least one group R2 is hydrogen or two groups R2 are ortho to one another and have a significance of R1 (preferably OH) and the other two groups R2 are ortho to one another and form a group (-CH=CH-CH=N-) ( alpha ) or (-N=CH-CH=CH-) ( beta ); and 1,2-dihydroxyanthra-9,10-quinone, 1,2,4-trihydroxyanthra-9,10-quinone and isoviolanthrone are excluded.    DESCRIPTION OF DRAWING(S) - The figure shows a photovoltaic cell.    Glass substrate (1, 7)    Conductive tin dioxide layer (2, 6)    Electrolyte (3)    Dye (4)    Titanium dioxide. (5)