Self-assembled hole-selective contact for efficient Sn-Pb perovskite solar cells and all-perovskite tandems

Self-assembled monolayers (SAMs) have displayed unpredictable potential in efficient perovskite solar cells (PSCs). Yet most of SAMs are largely suitable for pure Pb-based devices, precisely developing promising hole-selective contacts (HSCs) for Sn-based PSCs and exploring the underlying general mechanism are fundamentally desired. Here, based on the prototypical donor-acceptor SAM MPA-BT-BA (BT), oligoether side chains with different length (i.e., methoxy, 2-methoxyethoxy, 2-(2-methoxyethoxy)ethoxy group) were custom-introduced on the benzothiadiazole unit to produce the target SAMs with acronyms MPA-MBT-BA (MBT), MPA-EBT-BA (EBT), and MPA-MEBT-BA (MEBT), respectively, and acting as HSCs for efficient Sn-Pb…

• NN
  National Natural Science Foundation of China

  Awards: 62174112, 22379126, 62174112 and 22379126
• SU
  Sichuan University

  Award: 2020SCUNG102
• FR
  Fundamental Research Funds for the Central Universities

  Award: YJ2021157