This manuscript investigates the origins of the PEDOT:PSS de-doping effect in amine-containing perovskite solar cells (PSCs) using a combination of chemical, electronic, and computational methods. The authors identified that this effect stems from the diffusion of amines from the perovskite photoactive layer into the PEDOT:PSS layer. Interestingly, they found that the universally utilized thiocyanate additives could impede this unwanted diffusion process, leading to improved device efficiency but compromised stability due to cyanogen formation from thiocyanate-iodine interactions.

To mitigate this degradation pathway, the authors introduced benzyl hydrazine chloride (BHC) as an iodine reductant in lead-tin (Pb-Sn) PSCs, achieving an impressive efficiency of 23.2% with enhanced operational stability. However, despite the title "23.2% Efficient Low Band Gap Perovskite Solar Cells with Cyanogen Management," only Fig. 5, Supplementary Fig. 6, and Supplementary Fig. 49 pertain to Pb-Sn PSCs. Most of the characterizations were performed on the structure of PEDOT:PSS/methylammonium lead iodide (MAPI) absorbed layers. This discrepancy may confuse readers about the specific focus of the study. Therefore, a major revision is necessary before this manuscript can be considered for publication in EES.

Additionally, several issues need to be addressed and clarified:

1. Supplementary Fig. 2 shows the optimization of PEDOT:PSS/MAPI devices with the incorporation of the GASCN additive. Interestingly, the introduction of 4% GASCN decreased device efficiency, whereas higher concentrations (8%, 12%, and 16%) improved performance. Could the authors clarify why this occurs?

2. Supplementary Fig. 4 presents the impact of GASCN on the device performance of PEDOT:PSS/Cs0.1FA0.6MA0.3Pb0.5Sn0.5I3 PSCs. However, the two J-V curves provided seem unconvincing. The authors should include statistical data, similar to those shown in Supplementary Figs. 1-3.

3. On page 10, the authors used several time and frequency domain characterizations to identify the origins of device losses. They compared three samples: PEDOT:PSS/MAPI, PEDOT:PSS/MAPI+SCN-, and PTAA/MAPI, deducing that the buried PEDOT:PSS interface directly contributes to performance losses. However, it seems that the incorporated SCN- in the perovskite precursor primarily mitigates bulk trap states. Thus, the findings between PEDOT:PSS/MAPI and PEDOT:PSS/MAPI+SCN- do not directly elucidate the origins of performance losses derived from PEDOT:PSS.

4. The authors describe the observed PEDOT:PSS de-doping after the addition of MAI as similar to NaOH-induced de-doping. However, the manuscript does not clearly explain the origins of NaOH-induced de-doping. The authors should provide more details on this phenomenon.

5. The authors only display device performance and characterizations of Pb-Sn PSCs with and without BHC, without providing information on the corresponding film properties. It would be beneficial if the authors could include more details on film morphology, crystal structure, optoelectronic properties, etc., after the introduction of BHC.

The authors have addressed my concerns effectively, enhancing the manuscript with additional data and detailed explanations of their findings. They demonstrate a solid understanding of the study's implications and limitations. Although discussing suboptimal GASCN loading within this manuscript could provide a more complete analysis, the revisions made are substantial. I recommend publication in Energy & Environmental Science, as the manuscript now provides clearer insights and robust data supporting the conclusions.