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Solar cells with photosensitive pigments (Dye-Sensitized Solar Cell or DSSC by Lumtec) are devices made up of a porous layer of nanoparticles of titanium titanium covered with a molecular dye, a redox torque and a metal-based counter-electrode (PT) which produces electricity. PCE (power conversion efficiency) performance is still low (13%), but R&D is very active for development these inexpensive devices.