Minimizing Buried Interface Energy Losses with Post‐Assembled Chelating Molecular Bridges for High‐Performance and Stable Inverted Perovskite Solar Cells

Self-assembled monolayers (SAMs) as hole-collecting materials have made remarkable progress in inverted perovskite solar cells (PSCs). However, the incomplete coverage of SAMs and the non-intimate interface contact between perovskite/SAMs usually cause inferior interface characteristics and significant energy losses at the heterojunction interface. Herein, a post-assembled chelating molecular bridge strategy using 5-(9H-carbazol-9-yl)isophthalicacid (CB-PA) is developed to modify the perovskite/SAMs buried interface. It is found that CB-PA can be chemically coupled with MeO-2PACz through π-π stacking between carbazole groups, and chelate with perovskite by forming double C═O···Pb bonds, thus constructing a…

• NN
  National Natural Science Foundation of China

  Awards: 61974045, 6247031195
• NS
  Natural Science Foundation of Guangdong Province

  Awards: 2023A1515012733, 2019A1515012092