Perovskite Grain‐Boundary Manipulation Using Room‐Temperature Dynamic Self‐Healing “Ligaments” for Developing Highly Stable Flexible Perovskite Solar Cells with 23.8% Efficiency

Abstract Flexible perovskite solar cells (pero‐SCs) are the best candidates to complement traditional silicon SCs in portable power applications. However, their mechanical, operational, and ambient stabilities are still unable to meet the practical demands because of the natural brittleness, residual tensile strain, and high defect density along the perovskite grain boundaries. To overcome these issues, a cross‐linkable monomer TA‐NI with dynamic covalent disulfide bonds, H‐bonds, and ammonium is carefully developed. The cross‐linking acts as “ligaments” attached on the perovskite grain boundaries. These “ligaments” consisting of elastomers and 1D perovskites can not only passivate the grain boundaries and…

• NN
  National Natural Science Foundation of China

  Awards: 51820105003, 52273188, 2020YFB1506400, 22075194
• SU
  Soochow University
• PA
  Priority Academic Program Development of Jiangsu Higher Education Institutions
• CI
  Collaborative Innovation Center of Suzhou Nano Science and Technology
• NP
  National Postdoctoral Program for Innovative Talents

  Award: BX20220221
• NK
  National Key Research and Development Program of China

  Award: 2020YFB1506400