TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The electron acceptor material is an electrolyte capable of undergoing an oxidation-reduction reaction. (E2) Additionally comprises a catalyst for the oxidation-reduction reaction. The photoactivatable dyes of the PV cell modules are capable of absorbing light having different wavelength ranges. A spectrum of light received by the PV power source comprises the wavelength ranges of light absorbed by the photoactivatable dyes of all of the PV cell modules. (E1) And (E2) comprises a transparent material. The transparent material is indium tin oxide, tin oxide, indium oxide, zinc oxide, indium zinc oxide, zinc indium tin oxide, antimony oxide, silver, gold, aluminum, copper, steel and/or nickel. The electrolyte comprises a mixture of iodine and an iodide salt, or a mixture of bromine and a bromide salt. Each PV cell of the module additionally comprises a first transparent substrate on which (E1) is disposed, a second substrate on which (E2) is disposed, and a seal disposed around an edge of each PV cell to contain the electrolyte. The first and second substrates comprise a material of glass or transparent polymeric materials (preferably transparent polymeric material). Two outside substrates exposed to an environment are coated with a barrier coating. The barrier coating comprises either a multilayer of several alternating layers of at least an organic polymeric material or at least an inorganic material.    TECHNOLOGY FOCUS - METALLURGY - The electron donor material comprises a semiconductor material disposed in electrical contact with (E1). The semiconductor material has a coating comprising a photoactivatable dye. The semiconductor material is selected from oxides of the transition metal elements (preferably oxides of titanium, zirconium, hafnium, strontium, zinc, indium, yttrium, lanthanum, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, iron, nickel and/or silver).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - The dyes of the modules are different and selected from organometallic complexes having a formula MX3Lt or MXYLt (preferably azo dyes, quinone dyes, quinoneimine dyes, quinacridone dyes, squarylium dyes, cyanine dyes, merocyanine dyes, triphenylmethane dyes, xanthene dyes, porphyrin dyes, phthalocyanine dyes, perylene dyes, indigo dyes or naphthalocyanine dyes).M = a transition metal selected from ruthenium, osmium, iron, rhenium or technetium;Lt = tridentate ligand comprising heterocycles (preferably pyridine, thiophene, imidazole, pyrazole, triazole, carrying at least one functional group selected from carboxylic, phosphoric, hydroxamic acid or chelating groups);X = a co-ligand selected from NCS, Cl, Br, I, CN, NCO, H2O, NCH or pyridine (optionally substituted by at least one vinyl, primary amine, secondary amine, tertiary amine, OH or 1-30C alkyl);Y = a co-ligand selected from 2,2'-bipyridine (optionally substituted by at least one 1-30C alkyl) or ortho-phenanthroline.    TECHNOLOGY FOCUS - POLYMERS - The electron donor material comprises a polymer selected from polyphenylene, poly(phenylene vinylene), polythiophene, polysilane, poly(thienylene vinylene), poly(isothianaphthene), their derivatives or copolymers. The electron acceptor material comprises a polymer selected from derivatives of poly(phenylene vinylene) having a functional group CN or CF3. EXAMPLE - Lines of a silver paste were printed on the SnO2 side of the coated glass pieces by screen-printing. Every two lines of silver paste were connected together at one end by a transverse line of the same silver paste. The silver lines served to increase the electrical conductivity through the SnO2 coating. Holes were drilled into a number of glass pieces that were printed with silver-paste lines and located between every two connected silver-paste lines. The glass pieces without holes served as the first electrodes of the final PV cells, and those with holes as the second electrodes. The glass pieces with the silver-paste lines printed thereon were fired in a furnace under a nitrogen atmosphere. A solution of 5 mM of chloroplatinic acid in isopropanol was dispensed dropwise and spread onto the SnO2-coated surface by the doctor blade method. The platinum-coated pieces were dried in air and then fired in a furnace under a nitrogen atmosphere for ramping at 10 C/minute and ambient temperature - 390degreesC, cooling down to below 200degreesC, and transferring to a glove box purged with nitrogen for further PV cell assembly. Titanium dioxide paste was deposited by screen-printing on the SnO2-coated surface. The glass pieces with TiO2 paste deposited thereon were placed in an ethanol-rich atmosphere for 10-20 minutes, and then fired in a furnace under oxygen atmosphere. A photoactivatable dye (e.g. bis(isothiocyanato)-ruthenium (II)-bis-2,2'-bipyridine-4,4'-dicarboxylic acid (N719)) was adsorbed on the TiO2 layer by soaking the TiO2-coated glass pieces overnight in a 0.5 mM solution of N719 dye (N719 dye (0.05943 g), acetonitrile (50 ml), and 2-methyl-2-propanol (50 ml)) inside a desiccator that is purged with a stream of nitrogen containing ethanol. A gasket of Surlyn (RTM; a thermoplastic polymer film) was provided as a spacer between a TiO2-coated glass piece and a Pt-coated glass piece. Portions of the gasket were removed at locations of the matching TiO2 and Pt portions of the coated glass pieces. The assembly of TiO2-coated glass piece/gasket/Pt-coated glass piece was hot pressed at 130degreesC for 80 seconds to adhere the gasket to the electrodes. An electrolyte solution comprising LiI (0.05), iodine (0.05 M), tert-butyl pyridine (0.5) and tetrapropylammonium iodide (0.5 M) was introduced into the space between the electrodes via the holes provided in the Pt-coated glass piece. The holes were then sealed with plastic plugs and hot pressed at 100degreesC for about 10 seconds to form a photovoltaic cell having N719 dye which absorbs strongly in wavelength of 450 - 550 nm.