%0 Journal Article
%T Efficient two-terminal all-perovskite tandem solar cells enabled by high-quality low-bandgap absorber layers
%J -
%D 2018
%R https://doi.org/10.1038/s41560-018-0278-x
%X Multi-junction all-perovskite tandem solar cells are a promising choice for next-generation solar cells with high efficiency and low fabrication cost. However, the lack of high-quality low-bandgap perovskite absorber layers seriously hampers the development of efficient and stable two-terminal monolithic all-perovskite tandem solar cells. Here, we report a bulk-passivation strategy via incorporation of chlorine, to enlarge grains and reduce electronic disorder in mixed tin¨Clead low-bandgap (~1.25£¿eV) perovskite absorber layers. This enables the fabrication of efficient low-bandgap perovskite solar cells using thick absorber layers (~750£¿nm), which is a requisite for efficient tandem solar cells. Such improvement enables the fabrication of two-terminal all-perovskite tandem solar cells with a champion power conversion efficiency of 21% and steady-state efficiency of 20.7%. The efficiency is retained to 85% of its initial performance after 80£¿h of operation under continuous illumination
%U https://www.nature.com/articles/s41560-018-0278-x