| Organic solar cells on glass plates. These are tandem solar cells: two planar heterojunction cells are stacked on top of each other. In this way, the efficiency of organic solar cells can be increased. A power conversion efficiency of 5.15% was achieved, which is a 40% improvement over single devices. An innovative feature of these tandem cells is the all-evaporated interconnection scheme based on an electron-transport layer, metal nanoparticles and a hole-transport layer. The goal is to screen candidate materials with absorption spectra at even higher wavelengths and to use these in a stack of 3 or more cells, eventually targeting efficiencies over 10%. Credit/caption: IMEC. |
