The review by Ye et al. makes a effective case for the integration of MOFs into various layers of perovskite solar cells (PSCs). However, the discussion of MOF–perovskite heterojunctions remains overly descriptive and lacks a critical evaluation of the physicochemical interactions at the interface, which are central to understanding carrier recombination dynamics. Despite repeatedly attributing performance enhancement to “defect passivation” or “improved crystallinity,” the authors fail to address a fundamental question: how do specific chemical interactions between MOF ligands and perovskite constituents quantitatively suppress interface recombination?
No comparative assessment is provided of key metrics such as interface trap state density, recombination lifetimes, or energy level offsets, which are essential to support claims of passivation and charge transfer efficiency. In the absence of such analysis, it is difficult to evaluate whether MOFs are acting primarily as physical scaffolds or actively participating in chemical coordination that alters electronic behavior. The review would benefit from a systematic framework that correlates ligand functionality (e.g., –NH₂, –COOH, –SH) with electronic effects at the interface, ideally supported by spectroscopic or transient analyses reported in the cited literature.
Without this, the conclusions on MOF-perovskite synergies risk appearing anecdotal rather than mechanistically substantiated. A deeper interrogation into the structure–function relationship at MOF/perovskite interfaces is needed to move the field forward.