16.8% Monolithic all perovskite triple junction solar cells via a universal two step solution process
Perovskite semiconductors hold a unique promise in developing multijunction solar cells with high efficiency and low cost. Besides design constraints to reduce optical and electrical losses, integrating several very different perovskite absorber layers in a multijunction cell imposes a great processing challenge. Here, we report a versatile two step solution process for high quality 1.73 eV wide 1.57 eV mid and 1.23 eV narrow bandgap perovskite films. Based on the development of robust and low resistivity interconnecting layers, we achieve power conversion efficiencies of above 19% for monolithic all perovskite tandem solar cells with limited loss of potential energy and fill factor. In a combination of 1.73 eV, 1.57 eV, and 1.23 eV perovskite sub cells, we further demonstrate a power conversion efficiency of 16.8% for monolithic all perovskite triple junction solar cells.
Nature communications