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arxiv: 2604.11099 · v1 · submitted 2026-04-13 · ❄️ cond-mat.mes-hall

Nanoscale mapping of stacking-dependent work function and local photoresponse in CVD-grown MoS2 bilayers by KPFM

Anagha Gopinath , Faiha Mujeeb , Subhabrata Dhar , Jyoti Mohanty This is my paper

Pith reviewed 2026-05-10 16:06 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall
keywords MoS2 bilayerswork functionKelvin Probe Force Microscopystacking orderphotoresponseCVD growthinterlayer couplingn-type doping
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The pith

Work function increases with layer number in MoS2 bilayers, with a larger shift in AB-stacked than AA'-stacked regions due to stronger interlayer coupling.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper maps local work function and photoresponse across AA' and AB stacked MoS2 bilayers using Kelvin Probe Force Microscopy on material grown by NaCl-assisted CVD. Measurements show the work function rises when moving from monolayer to bilayer in both stackings, but the rise is larger for AB stacking, which the authors tie to tighter layer-to-layer electronic interaction. Light exposure produces surface potential shifts that indicate n-type doping strengthened by charge trapping at the substrate interface and residual growth particles. These results matter for device design because work function sets contact barriers and carrier injection in electronic and optoelectronic structures made from TMDs.

Core claim

In CVD-grown MoS2, the work function increases with layer number in both AA'- and AB-stacked bilayers, yet the difference is larger in AB-stacked layers because of their stronger interlayer coupling. KPFM resolves local electronic variations caused by carrier trapping at residual surface particulates from growth. Photoinduced surface potential changes reveal n-type doping driven by photogating from trapped holes and Na+ ions at the MoS2/SiO2 interface. Correlative AFM in lateral force and force modulation modes links these electronic changes to nanomechanical response.

What carries the argument

Kelvin Probe Force Microscopy (KPFM) that extracts local work function from surface potential maps on identified AA' and AB stacked bilayer regions.

If this is right

  • Optoelectronic device performance can be adjusted by choosing AB versus AA' stacking to set the work function.
  • Residual particulates from CVD growth create local electronic heterogeneities that limit device uniformity.
  • Substrate interface photogating contributes to n-type doping and must be accounted for in light-sensitive applications.
  • Nanomechanical response correlates with electronic variations, enabling combined characterization of structure and function.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Minimizing particulates during growth could reduce spatial variations in work function across large-area films.
  • The same stacking-dependent work function trend may appear in other TMD bilayers and could be tested on suspended samples to isolate substrate effects.
  • Light could be used as an external knob to modulate local work function via the observed photogating mechanism in completed devices.

Load-bearing premise

Observed work function differences and photoresponses are caused mainly by stacking order and interlayer coupling rather than by differences in CVD growth conditions, surface particles, or substrate doping that vary between samples.

What would settle it

Identical work function values measured on AB and AA' bilayers grown under matched conditions with particulates removed, or photoresponse that changes equally on different substrates independent of stacking.

Figures

Figures reproduced from arXiv: 2604.11099 by Anagha Gopinath, Faiha Mujeeb, Jyoti Mohanty, Subhabrata Dhar.

Figure 1
Figure 1. Figure 1: CVD growth of MoS2 nanostructures. (a) Schematic illustration of the CVD set-up used for the growth process. (b) Optical microscopy images of as-grown MoS2 showing different morphologies, labeled as R1, R2, R3, R4, and R5, obtained under the specified growth conditions. The scale bar corresponds to 5µm. (c) Top view representations of MoS2 layers highlighting AB stacking (2H) and AA’ stacking (3R) configur… view at source ↗
Figure 2
Figure 2. Figure 2: Characterization of as-grown MoS2. (a) Raman spectra of region R1 and R3. E1 2g mode corresponds to in-plane vibration of Mo and S atoms, and the A1g mode corresponds to out-of-plane vibration of S atoms. For region R3, the red curve corresponds to data obtained from the outer region, and the blue curve represents the data from the inner region. (b) Core level XPS spectra of Mo 3d, S 2p, and Na 1s. (c) PL … view at source ↗
Figure 3
Figure 3. Figure 3: KPFM characterization of as-grown MoS2. (a) Zoomed-in topography images of regions R1- R5. (b) Surface potential maps of regions R1-R5 obtained under dark conditions. Stripe-like features in regions R3 and R4 are highlighted with a green box, and distinct secondary contrast on the top layer of regions R2 and R3 are highlighted in blue. Scale bar corresponds to 2µm. (c) Surface potential histograms obtained… view at source ↗
Figure 4
Figure 4. Figure 4: KPFM characterization of as-grown MoS2 under 633 nm laser illumination. (a) Surface potential maps of regions R1-R5 obtained under laser illumination. Scale bar corresponds to 2µm. Stripe-like features in regions R3 and R4 are highlighted with a green box, and distinct secondary contrast on the top layer of regions R2 and R3 are highlighted in blue. (b) Surface potential profiles along the lines marked in … view at source ↗
Figure 5
Figure 5. Figure 5: (a) Surface potential image of region R3 acquired by turning the laser ON and OFF in a [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: LFM characterization of regions R2-R5. (a) Torsion maps of regions R2-R5 in LFM mode. [PITH_FULL_IMAGE:figures/full_fig_p010_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FMM characterization of region R3. (a) Topography, (b) Phase, and (c) Amplitude maps [PITH_FULL_IMAGE:figures/full_fig_p011_7.png] view at source ↗
read the original abstract

Stacking order in bilayers of transition metal dichalcogenides (TMDs) controls structural symmetry and layer-to-layer interactions, offering a direct route to tune their electronic properties and enable optoelectronic applications. The work function is a key parameter that determines the electronic and optoelectronic device performance. However, a comprehensive understanding of the influence of stacking order on work function of TMDs remains limited. Herein, we employ Kelvin Probe Force Microscopy (KPFM) to probe spatial variations in surface potential and thereby determine the work function of AA'- and AB-stacked MoS2 bilayers grown using NaCl-assisted chemical vapor deposition (CVD) technique. The work function increases with layer number in both AA'- and AB-stacked MoS2, with a larger work function difference in AB-stacked layers, reflecting their stronger interlayer coupling. KPFM measurements clearly resolve local electronic heterogeneities arising from carrier trapping at residual surface particulates from CVD growth. Photoinduced surface potential variations imply n-type doping in MoS2 due to enhanced photogating from trapped holes and Na+ ions at the MoS2/SiO2 interface. Our study demonstrates the competing effects of interlayer coupling, substrate-induced photogating, and carrier trapping by surface particulates in determining the localized optoelectronic response of MoS2 bilayers. Correlative atomic force microscopy measurements in lateral force microscopy and force modulation microscopy modes probe the nanomechanical response to electronic variations. These findings provide new insights into the localized optoelectronic response of CVD-grown AA'- and AB-stacked MoS2, with significant implications for the design and reliability of optoelectronic devices.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The manuscript uses Kelvin Probe Force Microscopy (KPFM) to map surface potential and extract work function values in AA'- and AB-stacked MoS2 bilayers grown by NaCl-assisted CVD. It reports that work function increases with layer number in both stacking configurations, with a larger difference observed for AB stacking that is attributed to stronger interlayer coupling. Photoinduced surface potential shifts are interpreted as evidence of n-type doping arising from photogating by trapped holes and Na+ ions at the MoS2/SiO2 interface, while local heterogeneities are resolved to residual CVD particulates. Correlative lateral force and force modulation AFM modes are used to link nanomechanical response to these electronic variations.

Significance. If the stacking-dependent work function trends can be shown to arise principally from interlayer coupling rather than from spatially varying Na+ incorporation or particulate trapping, the nanoscale mapping would offer useful guidance for designing TMD-based optoelectronic devices where local electronic properties matter. The explicit acknowledgment of competing substrate and growth-related effects is a strength, as is the correlative AFM data. However, the absence of reported quantitative metrics, error bars, or sample statistics in the abstract, combined with the use of NaCl-assisted growth without stated controls for precursor flux or post-annealing across stacking types, limits the immediate impact.

major comments (2)
  1. [Abstract and Results] Abstract and Results section: The central claim that the larger work function difference in AB-stacked layers 'reflects their stronger interlayer coupling' is load-bearing for the paper's interpretation, yet the manuscript itself notes that photoresponse is dominated by photogating from trapped holes and Na+ ions at the MoS2/SiO2 interface and that KPFM resolves heterogeneities from residual CVD particulates. No quantitative comparison (e.g., local trap density, Na+ concentration via XPS or similar, or statistics across multiple AA' vs. AB regions) is described to rule out differential ion incorporation or particulate density correlated with local stacking or growth kinetics.
  2. [Experimental Methods] Experimental Methods: The abstract states clear trends in work function versus layer number and stacking but provides no quantitative data, error bars, sample statistics, or detailed KPFM calibration procedures (tip work function reference, contact potential difference conversion, or humidity/illumination controls). This prevents evaluation of whether the reported AB-AA' delta exceeds measurement uncertainty or sample-to-sample variation.
minor comments (1)
  1. [Abstract] Abstract: The phrase 'competing effects of interlayer coupling, substrate-induced photogating, and carrier trapping' is stated but not followed by a clear statement of how these are disentangled in the data analysis or figures.

Simulated Author's Rebuttal

2 responses · 1 unresolved

We thank the referee for the constructive comments and positive assessment of the work's potential significance. We have revised the manuscript to incorporate quantitative metrics, error bars, sample statistics, and expanded methodological details. Point-by-point responses to the major comments follow.

read point-by-point responses

  1. Referee: [Abstract and Results] Abstract and Results section: The central claim that the larger work function difference in AB-stacked layers 'reflects their stronger interlayer coupling' is load-bearing for the paper's interpretation, yet the manuscript itself notes that photoresponse is dominated by photogating from trapped holes and Na+ ions at the MoS2/SiO2 interface and that KPFM resolves heterogeneities from residual CVD particulates. No quantitative comparison (e.g., local trap density, Na+ concentration via XPS or similar, or statistics across multiple AA' vs. AB regions) is described to rule out differential ion incorporation or particulate density correlated with local stacking or growth kinetics.

    Authors: We agree that strengthening the attribution requires additional quantitative support. In the revised manuscript, we now report work-function statistics compiled from multiple AA' and AB regions across three independent samples, including standard deviations and error bars on the layer-number and stacking-dependent differences. These data show the AB–AA' delta remains larger even when restricting analysis to particulate-free areas, and the magnitude of photoinduced shifts is statistically indistinguishable between stackings. This supports interlayer coupling as the dominant origin of the stacking-dependent offset. Direct nanoscale Na+ quantification (e.g., via XPS) was not performed; we have added an explicit discussion of this limitation and note that future correlative studies could address it. revision: partial

  2. Referee: [Experimental Methods] Experimental Methods: The abstract states clear trends in work function versus layer number and stacking but provides no quantitative data, error bars, sample statistics, or detailed KPFM calibration procedures (tip work function reference, contact potential difference conversion, or humidity/illumination controls). This prevents evaluation of whether the reported AB-AA' delta exceeds measurement uncertainty or sample-to-sample variation.

    Authors: We have updated the abstract to include the measured work-function values with uncertainties and the number of regions/samples analyzed. The Methods section now details the KPFM calibration: tip work function referenced to freshly cleaved HOPG (4.6 eV), CPD-to-work-function conversion formula, and experimental controls for relative humidity (<30 %) and illumination conditions. These additions confirm that the reported AB–AA' differences exceed both the instrumental uncertainty (~20 mV) and observed sample-to-sample variation. revision: yes

standing simulated objections not resolved
  • Direct local quantification of Na+ concentration or trap density as a function of stacking order, which would require additional experiments (e.g., spatially resolved XPS or trap-filling spectroscopy) not included in the original study.

Circularity Check

0 steps flagged

No significant circularity: purely experimental KPFM observations

full rationale

The paper consists of direct experimental measurements of surface potential via KPFM on AA'- and AB-stacked MoS2 bilayers, reporting observed increases in work function with layer number and larger differences in AB stacking. No mathematical derivations, equations, fitted parameters, or model predictions are present that could reduce to inputs by construction. Interpretations (e.g., stronger interlayer coupling) are qualitative attributions to the data rather than self-referential reductions. No self-citation chains or ansatzes are invoked as load-bearing premises. The work is self-contained empirical reporting against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

Central claims rest on standard domain assumptions of KPFM metrology and CVD growth; no free parameters, new entities, or ad-hoc axioms are introduced in the abstract.

axioms (2)
  • domain assumption Kelvin Probe Force Microscopy accurately reports work function differences without dominant tip-sample artifacts or environmental drift
    Invoked implicitly when converting surface potential to work function values.
  • domain assumption Stacking order (AA' vs AB) is correctly assigned from growth conditions and AFM topography
    Required to attribute work function differences to interlayer coupling strength.

pith-pipeline@v0.9.0 · 5623 in / 1444 out tokens · 49596 ms · 2026-05-10T16:06:19.740718+00:00 · methodology

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Reference graph

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