Regulating Surface Termination for Efficient Inverted Perovskite Solar Cells with Greater Than 23% Efficiency

Passivating surface and bulk defects of perovskite films has been proven to be an effective way to minimize nonradiative recombination losses in perovskite solar cells (PVSCs). The lattice interference and perturbation of atomic periodicity at the perovskite surfaces often significantly affect the material properties and device efficiencies. By tailoring the terminal groups on the perovskite surface and modifying the surface chemical environment, the defects can be reduced to enhance the photovoltaic performance and stability of derived PVSCs. Here, we report a rationally designed bifunctional molecule, piperazinium iodide (PI), containing both R2NH and R2NH2+ groups on the same six-membered ring, behaving…

• CU
  City University of Hong Kong

  Awards: 6000672, 9610421, 9380086
• GO
  Government of Guangdong Province

  Award: 2019B030302007
• RG
  Research Grants Council, University Grants Committee

  Awards: CityU 21301319, C5037-18G
• NS
  Natural Science Foundation of Guangdong Province

  Award: 2019A1515010761
• AF
  Air Force Office of Scientific Research

  Award: FA9550-18-1-0046