{"id":"7fd9bf39-7382-4b49-8fc8-bbc923672bfd","arxiv_id":"2607.07221","paper_version":2,"verdict":"ACCEPT","confidence":"HIGH","novelty_score":6.0,"correctness_risk":"low","formal_verification":"none","parameter_count":2,"one_line_summary":"AEAPTMS passivation narrows dark CPD spread from ~46 to ~15 mV, raises SPV from ~345 to ~417 mV with faster stabilisation, and reduces grain-boundary potential barriers in mixed-halide perovskite films.","lead":"Amino-silane passivation (AEAPTMS) makes perovskite film surface potentials more uniform and raises steady-state surface photovoltage while speeding its rise under light. The work shows this at the nanoscale with KPFM and links the gains to suppressed grain-boundary barriers.","discovery_kind":"new_application","skeptic_critique":{"model":"grok-4.5","headline":"No significant objection identified","rationale":"The strongest claim is a set of directly measured KPFM quantities (FWHM of dark CPD, steady-state SPV and τ from exponential fits, polarity and magnitude of ΔCPD = CPD_GI − CPD_GB). These are supported by the figures and open code. The reader’s weakest_assumption correctly identifies the softest interpretive link (SPV as local QFLS proxy under bottom illumination; topography-derived masks as pure electronic barriers). That link is acknowledged in the text with cautious language and is not required for the numerical claims themselves to stand. No hidden circularity, no parameter-sensitive derivation, and no contradiction with the wavelength-dependent controls. Therefore the ACCEPT verdict and low correctness_risk stand; the concrete mask-independence check is a useful verification rather than a condition for acceptance.","tokens_in":12339,"tokens_out":451,"duration_ms":51380,"concrete_test":"Re-process the same raw CPD images with an independent GB mask (e.g., watershed or Canny edges on height, or a fixed-width morphological dilation independent of the authors’ pipeline) and recompute ΔCPD vs mask width for both conditions; if the passivated ΔCPD remains systematically closer to zero and the dark FWHM ratio stays ~3×, the GB-suppression claim is robust to mask definition.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The paper’s central claim is an experimental observation set (dark CPD homogenisation, larger/faster SPV, reduced GB ΔCPD) under AM-KPFM with bottom illumination, not a device-level VOC prediction. The reader’s weakest_assumption correctly flags the interpretive step from SPV/ΔCPD to QFLS and barrier height, but that step is presented as correlative (“indicative of”, “consistent with”) rather than as a quantitative identity. Bottom illumination, tip-convolution and residual topographic coupling are real caveats for any KPFM study of this type; they do not invert the measured trends or create an internal inconsistency. Open analysis code and multi-wavelength controls further reduce the risk that the headline numbers are artefacts.","agreement_with_reader":"agree"},"referee_report":{"model":"grok-4.5","summary":"The manuscript uses amplitude-modulated Kelvin probe force microscopy (AM-KPFM) with bottom illumination to map how AEAPTMS passivation alters the nanoscale surface potential and photovoltage dynamics of FA0.83Cs0.17Pb(I0.9Br0.1)3 films. In the dark, passivation narrows the CPD distribution from ~45.7 mV to ~14.6 mV FWHM without morphological change. Under ~1-sun white light, passivated films reach a larger steady-state SPV (~417 vs ~345 mV) with a shorter exponential time constant (~470 vs ~840 s). Wavelength-dependent SPV (365 nm vs 850 nm) indicates reduced sub-bandgap electronic disorder, and a topography-derived grain-boundary masking pipeline shows that AEAPTMS reduces the magnitude of ΔCPD = CPD_GI − CPD_GB, consistent with suppression of grain-boundary potential barriers. Open analysis code is provided.","tokens_in":12555,"tokens_out":964,"duration_ms":10422,"significance":"The work supplies direct nanoscale electronic evidence for a passivation chemistry previously validated mainly at device level, linking amino-silane treatment to CPD homogenisation, faster SPV stabilisation, and reduced GB barriers. The multi-wavelength temporal SPV protocol and the open-source GB-masking analysis are reusable tools for the perovskite KPFM community. If the measured trends hold, they strengthen the mechanistic case that AEAPTMS improves carrier landscape homogeneity and thereby supports higher photovoltage. Strengths include reported fit uncertainties, multi-image GB analysis, and released code.","major_comments":[{"comment":"Results (Figs 2–3 and associated text): SPV is repeatedly described as a localised proxy for QFLS/VOC. The manuscript should state more explicitly that bottom illumination and free-surface (probe–perovskite) geometry make SPV only correlative with device VOC, not a quantitative identity. A short paragraph quantifying or bounding possible contributions from ion motion, tip–sample electrostatics, and bottom-side generation would keep the central claim load-bearing without over-interpretation.","section":null},{"comment":"Results, grain-boundary analysis (Fig 5, Note S6): The claim that AEAPTMS suppresses GB potential barriers rests on topography-derived masks. The paper already notes mask-width and image-to-image variation (Fig S4). A brief control or discussion of residual topographic crosstalk / tip convolution (e.g., comparison of ΔCPD on regions of similar height contrast, or a statement of lateral resolution relative to GB width) is needed so that the ΔCPD → 0 conclusion is not vulnerable to topographic artefacts.","section":null}],"minor_comments":[{"comment":"Fig 1 caption / text: the CPD peak-position shift is dismissed as uncalibrated; a one-sentence statement that absolute CPD is not interpreted would avoid reader confusion.","section":null},{"comment":"Eqs (1)–(2) and surrounding text: notation for work function (Φ vs ϕ) is inconsistent; standardise.","section":null},{"comment":"Methods / SI: illumination spectra and intensity calibration for the white lamp and monochromatic LEDs are referenced (Fig S6, Note S8); ensure the main text briefly states approximate photon flux or equivalent suns for 365 nm and 850 nm so wavelength comparisons are self-contained.","section":null},{"comment":"Typographical: “Collated pixel distributions” and occasional missing articles; a light copy-edit pass would improve readability.","section":null},{"comment":"References: several self-citations to the authors’ prior AEAPTMS device paper are appropriate for context; ensure non-self literature on amino-silane and KPFM SPV is balanced.","section":null}],"recommendation":"minor_revision","confidential_remarks":"The central experimental observations are solid and the interpretive caveats are standard for free-surface KPFM rather than fatal. Fit to a materials/condensed-matter journal is good; the open code is a genuine plus. I would not require new device VOC data for acceptance, only clearer language on the SPV–QFLS link and a short topographic-artefact discussion."},"author_rebuttal":null,"desk_editor":{"model":"grok-4.5","letter":"This is a clean experimental materials paper. The new pieces are quantitative: dark CPD FWHM drops from ~45.7 to ~14.6 mV with no morphology change, steady-state SPV rises ~345→417 mV while τ falls ~840→470 s, sub-bandgap (850 nm) SPV shrinks, and a topography-mask pipeline shows ΔCPD = CPD_GI − CPD_GB closer to zero across mask widths. They ship the GB-separation code. That package is useful and reproducible.\n\nWhat they do well is keep the claims close to the observables. Multi-wavelength temporal SPV (white, 365 nm, 850 nm) plus variable-mask GB analysis give a coherent picture that AEAPTMS reduces surface and GB-related electronic disorder and long-lived transients. Uncertainties on the fits are reported; multiple images are shown for the mask dependence. Self-cites to the prior device paper supply context for the passivant without forcing the KPFM numbers. Citations look normal for the subfield.\n\nSoft spots are the usual KPFM ones, not load-bearing flaws. Bottom illumination means generation is weighted toward the glass side while CPD is read at the top surface, so SPV is a surface proxy, not a direct QFLS or device VOC. They mostly write “indicative of / consistent with,” which is honest. Tip convolution and residual topographic coupling can still affect absolute ΔCPD; the multi-image, multi-width approach mitigates but does not erase that. Free parameters (exponential A/τ, mask width) are explicit and not used circularly. No invented entities, no internal contradiction.\n\nWho it is for: people who already care about passivation mechanisms and local potential landscapes in mixed-halide FACs films. Not a paradigm shift, but a concrete mechanism plus a reusable analysis tool. I would send it to peer review; a serious referee will tighten the SPV–QFLS language and ask for a couple more controls, not reject the data. Worth engaging if you work on perovskite interfaces or KPFM analysis.","headline":"Solid nanoscale KPFM evidence that AEAPTMS flattens dark CPD, speeds and enlarges SPV, and damps GB barriers, with open analysis code; the QFLS/VOC link is correlative, not a hard identity.","tokens_in":13144,"tokens_out":546,"would_cite":true,"duration_ms":6175,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"grok-4.5","headline":"Amino-silane passivation flattens perovskite surface potential, raises photovoltage, and cuts grain-boundary barriers.","keywords":["Kelvin probe force microscopy","surface photovoltage","perovskite passivation","AEAPTMS","grain boundaries","contact potential difference","quasi-Fermi level splitting"],"falsifier":"If independent surface-photovoltage or device open-circuit-voltage measurements on identically prepared films show no increase after AEAPTMS treatment, or if higher-resolution potential maps reveal that the apparent barrier reduction is an artefact of tip convolution or mask width, the central interpretation fails.","tokens_in":13292,"feed_emoji":"⚡","tokens_out":679,"duration_ms":6807,"temperature":0.7,"pith_summary":"The paper sets out to show that a common amino-silane passivation molecule does more than improve solar-cell numbers: it rewrites the electronic map of a mixed-cation perovskite film at the nanoscale. Using amplitude-modulated Kelvin probe force microscopy, the authors map contact potential difference and surface photovoltage before and after treatment with AEAPTMS. They find the dark potential distribution collapses from roughly 46 mV to 15 mV wide, the steady-state photovoltage rises from about 345 mV to 417 mV, and the film settles under light almost twice as fast. Wavelength-dependent scans indicate less sub-bandgap disorder, and a grain-boundary masking analysis shows that the potential barrier between grains is strongly suppressed. A sympathetic reader cares because these local metrics supply a direct electronic explanation for the open-circuit-voltage gains that passivation is already known to deliver, and they do so without requiring full device fabrication.","feed_headline":"Passivation flattens perovskite potential and lifts photovoltage","feed_subtitle":"Nanoscale maps show AEAPTMS cuts grain-boundary barriers and halves the time to steady SPV","key_machinery":"Amplitude-modulated Kelvin probe force microscopy (AM-KPFM) under controlled bottom-side illumination, combined with a topography-derived grain-boundary mask that isolates CPD and SPV statistics for grain interiors versus boundaries.","core_discovery":"AEAPTMS homogenises the dark contact-potential-difference landscape of FA0.83Cs0.17Pb(I0.9Br0.1)3 films (FWHM from ~45.7 mV to ~14.6 mV), increases steady-state surface photovoltage from ~345 mV to ~417 mV while cutting the stabilisation time constant from ~840 s to ~470 s, reduces sub-bandgap response, and drives grain-boundary-to-interior potential differences toward zero, producing a more uniform and stable carrier landscape.","pith_inferences":[],"forward_implications":[],"fun_headline_variants":["AEAPTMS narrows perovskite CPD threefold and lifts SPV","Passivation cuts grain-boundary barriers, halves SPV time","AEAPTMS homogenises dark potential and speeds photovoltage","Silane passivation unifies carrier landscape in perovskites","KPFM maps show AEAPTMS flattens surface potential dynamics"],"cache_read_input_tokens":128,"weakest_assumption_plain":"The claim rests on treating the measured surface photovoltage under bottom illumination as a faithful local proxy for quasi-Fermi-level splitting and device open-circuit voltage, and on the grain-boundary masks cleanly separating electronic barriers from topographic artefacts.","fun_headline_variants_meta":{"raw":{"variants":["AEAPTMS narrows perovskite CPD threefold and lifts SPV","Passivation cuts grain-boundary barriers, halves SPV time","AEAPTMS homogenises dark potential and speeds photovoltage","Silane passivation unifies carrier landscape in perovskites","KPFM maps show AEAPTMS flattens surface potential dynamics"]},"model":"grok-4.5","effort":"low","cost_usd":0.005302,"raw_usage":{"total_tokens":1489,"prompt_tokens":812,"num_sources_used":0,"completion_tokens":72,"cost_in_usd_ticks":53020000,"prompt_tokens_details":{"text_tokens":812,"audio_tokens":0,"image_tokens":0,"cached_tokens":256},"completion_tokens_details":{"audio_tokens":0,"reasoning_tokens":605,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"tokens_in":812,"tokens_out":72,"duration_ms":5687,"temperature":1.0,"reasoning_tokens":605,"cache_read_input_tokens":256,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-07-10T19:44:29.522410+00:00","model_set":{"reader":"grok-4.5"},"falsifier":"If independent surface-photovoltage or device open-circuit-voltage measurements on identically prepared films show no increase after AEAPTMS treatment, or if higher-resolution potential maps reveal that the apparent barrier reduction is an artefact of tip convolution or mask width, the central interpretation fails.","supporting_citations":[],"review_version":2}