TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Composition: The transparent insulating material (1) is an inorganic and/or organic glass, plastic and/or flexible laminate. The transparent conductive coating (2) is a fluorine doped tin oxide, tin doped indium oxide, doped zinc oxide or thin silver layer. The porous layer (3) is titanium dioxide and/or an oxide of zirconium, hafnium, strontium, zinc, indium, yttrium, lanthanum, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, zinc, iron, nickel, and/or silver. The layer (8) of the counter electrode comprises particles of platinum, tungsten, molybdenum, chromium, titanium, titanium nitride, titanium carbide, tungsten carbide, fluorine or antimony doped tin oxide, doped zinc oxide, graphite powder, carbon black, polyaniline, polypyrrole, polythiophene or polyacetylene. The insulating intermediate layer (9) is aluminum oxide, zirconium oxide, silicon oxide or titanium dioxide. The catalytic intermediate layer (10) comprises 0.4 -40 wt.% catalyst, preferably platinum particles, optionally on a support of a semiconductor and/or doped mixed oxide. The radiation sensitive pigment is a complex of technetium, rhenium, iron, ruthenium, osmium or platinum or a cyanine dye. The electrolyte comprises a matrix material to control viscosity, preferably an intrinsically conductive polymer, hole-conducting nanoparticles or organic or inorganic thickening agents. The electrolyte comprises 1-methyl-3-hexyl-imidazolium iodide or is a mixture of I-/I-3 or Co2+/Co3+ complexes.Preferred Process: The catalytic intermediate layer is applied from solution or dispersion. Layers (3), (8), (9) and (10) are applied by painting, doctor blade, vapor deposition, sputtering, dipping, spraying or printing of a dispersion followed by sintering. Additional current carrying connectors and sealants are applied to the cell (I). The cell (I) is sealed to glass or laminate by heating to above the softening temperature of the transparent insulating material (1) and the covering material. The cell (I) is back-filled with dyestuff and/or electrolyte by means of vacuum.