Researchers at The University of Tokyo's Institute of Industrial Science developed a semi-transparent solar cell. Instead of conventional silicon, the cell uses an organic-inorganic hybrid material (perovskite) to generate electricity. This material efficiently absorbs blue light, and nanocubes of metallic silver improve the capture of red light, while letting visually important green light through. Because of the efficient light capture, the perovskite layer can be made very thin, improving its transparency. The cell could therefore be used to coat windows.