Converts photons from an infrared (IR) into visible light

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.

via New material converts invisible, infrared energy into visible light | Science | AAAS.

Solar cells surpass 20 percent efficiency

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.

via Perovskite solar cells surpass 20 percent efficiency.