The laser fires at a clear film of molecules consisting of tin and sulfur atoms arranged in a diamond-like pattern and surrounded by organic groups. The molecules in the film absorb the IR photons and re-emit that energy as higher-energy visible light photons.
After three long-term clinical trials, 70-80 percent of psoriasis patients saw it completely or almost completely cured – an impressive result for such a stubborn disease.
Michael Graetzel and his team found that, by briefly reducing the pressure while fabricating perovskite crystals, they were able to achieve the highest performance ever measured for larger-size perovskite solar cells, reaching over 20% efficiency and matching the performance of conventional thin-film solar cells of similar sizes. Their results are published in Science.