Simultaneous Contact and Grain‐Boundary Passivation in Planar Perovskite Solar Cells Using SnO 2 ‐KCl Composite Electron Transport Layer

Abstract The performance of perovskite solar cells is sensitive to detrimental defects, which are prone to accumulate at the interfaces and grain boundaries of bulk perovskite films. Defect passivation at each region will lead to reduced trap density and thus less nonradiative recombination loss. However, it is challenging to passivate defects at both the grain boundaries and the bottom charge transport layer/perovskite interface, mainly due to the solvent incompatibility and complexity in perovskite formation. Here SnO 2 ‐KCl composite electron transport layer (ETL) is utilized in planar perovskite solar cells to simultaneously passivate the defects at the ETL/perovskite interface and the grain boundaries of…

• NN
  National Natural Science Foundation of China

  Award: 61974063
• NS
  Natural Science Foundation of Jiangsu Province

  Award: BK20190315
• NK
  National Key Research and Development Program of China

  Award: 2018YFB1500102