Strengthening Substrate Anchoring of Polymeric Self‐Assembled Monolayers for Efficient and Stable Inverted Perovskite Solar Cells

ABSTRACT Small‐molecule‐based self‐assembled monolayers (SAMs) used as hole‐transporting layers have achieved exceptional efficiencies in inverted perovskite solar cells (PSCs). However, inadequate substrate coverage and insufficient operational stability of small molecules have led to the development of polymeric SAMs as an alternative. Nevertheless, the molecular configuration of polymeric SAMs remains underexplored, resulting in lower performance compared to small‐molecule SAMs. Here, our results show that the previously reported Poly‐4PACz contains linkage sites generating significant steric repulsion between monomers, forcing phosphate groups into an alternative alignment and reducing substrate anchoring…

• NS
  Natural Science Foundation of Shanghai

  Awards: 22ZR1428200, BL14B1
• SS
  Salt Science Research Foundation
• NN
  National Natural Science Foundation of China

  Awards: BL14B1, 52350610264
• SJ
  Shanghai Jiao Tong University