All perovskite tandem solar cells with efficiency over 26.5%

Abstract

The efficiency of the lead perovskite solar cells (Pb-PVK-PV) is now over 25% (1,2). Tandem cells consisting of the Pb-PVK-PV as the top cell and Si solar cells as the bottom cells have attracted attention as solar cells with the efficiency higher than Pb-PVK-PV. The certified efficiency is now 32.5% (2). In addition, especially, all perovskite tandem solar cells have an advantage over the tandem cells consisting of Pb-PVK-PV(top)/inorganic solar cells(bottom) from the view point of flexible tandem solar cells, because both top and bottom cells are fabricated by the low temperature-printable process. 28% efficiency has been reported as the all-perovskite tandem solar cells (1).