Buried Interface Modulation Using Self‐Assembled Monolayer and Ionic Liquid Hybrids for High‐Performance Perovskite and Perovskite/CuInGaSe 2 Tandem Photovoltaics

Abstract Effective modifications for the buried interface between self‐assembled monolayers (SAMs) and perovskites are vital for the development of efficient, stable inverted perovskite solar cells (PSCs) and their tandem photovoltaics. Herein, an ionic‐liquid‐SAM hybrid strategy is developed to synergistically optimize the uniformity of SAMs and the crystallization of perovskites above. Specifically, an ionic liquid of 1‐butyl‐3‐methyl‐1H‐imidazol‐3‐iumbis((trifluoromethyl)sulfonyl)amide (BMIMTFSI) is incorporated into the SAM solution, enabling reduced surface roughness, improved wettability, and a more evenly distributed surface potential of the SAM film. Leveraging this optimized substrate, a favorable…

• NN
  National Natural Science Foundation of China

  Awards: 52202292, 52322315, 22279099, 52172230
• NS
  Natural Science Foundation of Hebei Province

  Award: 2023AFA010
• FR
  Fundamental Research Funds for the Central Universities

  Awards: 2023IVB008, 2023IVB077