In this work, author introduce a plasma-modified graphitic carbon nitride (GCN_PT) as an ETL interface layer additive which is deposited onto the SnO2 electron transport layer to enhance electron extraction. Plasma modification transforms randomly distributed GCN particles (200~500 nm) into uniformly sized nanoparticles (1–3 nm) while inducing partial graphitization, significantly improving conductivity and charge transport properties.The result is interesting, but there are still some issues in the manuscript that need to be supplemented and revised.
1.GCN (GCN_PT) as an interfacial layer is placed between the SnO2 ETL and the PVSK absorber.I really want to know the thickness of GCN (GCN_PT) layer? Is there a chemical bond interaction between GCN (GCN_PT) and SnO2? Is there a transfer of charge?
2.From Figure 3e, it can be seen that compared to SnO2, The energy levels of SnO2/GCN and SnO2/GCN_PT materials have shifted downwards. The author should provide a reasonable explanation. Meanwhile, this downward shift in energy level distribution is likely unfavorable for electron collection. Can the author provide some explanation?
3.Does the insertion of GCN (GCN_PT) affect the water contact angle of SnO2 surface? Does changing the surface tension of tin oxide affect the crystallization of perovskite layers. So the author needs to provide surface measurements of the water contact angle of SnO2 before and after GCN (GCN_PT) insertion.
4.Plasma treatment can improve the conductivity and energy levels of GCN surface, and its physical mechanism needs further discussion, such as whether there is defect filling on the surface of tin oxide by plasma treatment? Is there a new combination of chemical bonds?
5.Some relevant references can be cited, which may enrich the content of the manuscript. For example:Advanced Functional Materials, 2024, 34, 2402128; Nano Energy, 2025, 133, 110513.

The author has made revisions to the manuscript based on the review comments, and I recommend that the revised manuscript can be accepted by the JMCA journal.