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arxiv: 2604.17729 · v1 · submitted 2026-04-20 · ❄️ cond-mat.mtrl-sci

Seed Layer Engineering for Effective Charge Transfer Doping of MoS₂ Transistors

Sahej Sharma , Shao-Heng Yang , Himani Jawa , Rana Yuvraj , Bach Nguyen , Chang Niu , Shiva Radhakrishnan , Shalini Tripathi
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Dennis Lin Cesar Javier Lockhart de la Rosa Pierre Morin Dmitry Zemlyanov Francesca Iacopi Zhihong Chen Joerg Appenzeller Thomas E. Beechem
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Pith reviewed 2026-05-10 04:53 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords MoS2seed layercharge transfer dopingHfOx2D transistorsRaman spectroscopyXPSinterface engineering
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The pith

The thickness and oxygen content during deposition of a Ta seed layer control both disorder and charge-transfer doping at the HfOx-MoS2 interface, directly setting transistor threshold voltage and on-current.

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

This paper shows that seed layers added to help dielectrics nucleate on monolayer MoS2 also govern how the dielectric dopes the channel through charge transfer. Varying the Ta seed thickness from 0.2 nm upward and changing the oxygen level during its deposition produced large, correlated shifts in electrical metrics and in Raman, photoluminescence, and X-ray photoelectron spectra. Optical spectra tracked on-current to seed-induced disorder, while XPS tracked threshold voltage to changes in the interfacial electrostatic environment. The work matters for anyone trying to integrate 2D semiconductors into logic devices, because it turns a routine adhesion step into a tunable knob for both defect density and doping without altering the main dielectric. Ultrathin 0.2 nm Ta layers grown oxygen-poor gave the best combination of limited damage and effective charge transfer.

Core claim

The seed layer both introduces disorder into the MoS2 channel and modifies the interfacial charge environment controlling charge transfer between HfOx and MoS2. Threshold voltage and on-current varied strongly with Ta-seed thickness and deposition conditions, and these changes correlated with signatures observed across all spectroscopic probes. Better performance was obtained with ultrathin 0.2 nm Ta seed layers deposited under oxygen-poor conditions, which limit deposition-induced damage while facilitating charge transfer.

What carries the argument

The Ta seed layer within the Ta/HfOx passivation stack, whose thickness and oxygen-poor deposition conditions simultaneously set the disorder level in the MoS2 channel and the interfacial electrostatic potential that drives charge transfer doping.

If this is right

  • On-current tracks the amount of seed-induced disorder measured by Raman and photoluminescence spectroscopy.
  • Threshold voltage shifts track changes in the local electrostatic environment measured by X-ray photoelectron spectroscopy.
  • Ultrathin 0.2 nm Ta seeds grown under oxygen-poor conditions simultaneously reduce deposition damage and enhance charge transfer, yielding the highest on-current and most stable threshold voltages.
  • Multimodal spectroscopy (Raman, photoluminescence, and XPS) can be used during fabrication to monitor and optimize the seed layer process in real time.
  • Seed-layer engineering offers a practical route to control both disorder and interfacial doping in MoS2 transistors while keeping the primary dielectric unchanged.

Where Pith is reading between the lines

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

  • The same seed-layer tuning approach could be tested on other 2D channels such as WS2 or MoSe2 to see whether the disorder-versus-doping trade-off is material-specific.
  • Because the spectroscopic signatures appear early in the process, they could serve as an in-line monitor for dielectric integration steps in a full semiconductor fab flow.
  • Combining this seed engineering with post-deposition annealing or surface passivation might further decouple the disorder and charge-transfer contributions.
  • The finding implies that any future 2D device process that inserts an adhesion or nucleation layer should re-evaluate that layer's electrical side-effects rather than treating it as electrically inert.

Load-bearing premise

The strong correlations between seed thickness and conditions, electrical metrics, and spectroscopic signatures are caused by seed-induced disorder and interfacial charge transfer rather than by other uncontrolled variables in fabrication or measurement.

What would settle it

Fabricating a set of devices in which the Ta seed is deposited and then selectively removed before HfOx growth, then measuring whether the same thickness-dependent trends in threshold voltage and on-current still appear, would test whether the seed itself is required to produce the observed doping and disorder effects.

Figures

Figures reproduced from arXiv: 2604.17729 by Bach Nguyen, Cesar Javier Lockhart de la Rosa, Chang Niu, Dennis Lin, Dmitry Zemlyanov, Francesca Iacopi, Himani Jawa, Joerg Appenzeller, Pierre Morin, Rana Yuvraj, Sahej Sharma, Shalini Tripathi, Shao-Heng Yang, Shiva Radhakrishnan, Thomas E. Beechem, Zhihong Chen.

Figure 1
Figure 1. Figure 1: (a) Schematic of the single-layer MoS2 FETs employing a Ta-seed (i.e., TaOx ) layer atop of which a 4.5-5 nm layer of HfOx was deposited for surface passivation. (b) Representative transfer curves for differing process splits in which varying the seed layer deposition significantly impacts device characteristics like VT H and ION . These changes are attributed to both damage to the MoS2 during seed-layer d… view at source ↗
Figure 2
Figure 2. Figure 2: Average (a) Raman and (d) photoluminescence spectra for each of the differing Ta [PITH_FULL_IMAGE:figures/full_fig_p009_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Correlation between fitted spectral and transistor characteristics. The (a) [PITH_FULL_IMAGE:figures/full_fig_p010_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Representative transfer curves for each process split comparing devices at each [PITH_FULL_IMAGE:figures/full_fig_p013_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: XPS-spectra of HfOx obtained via collection of the Hf4f lines for samples having Ta-seed thicknesses of (a) 0.2 nm (preconditioned target, 200◦C HfOx ) (b) 0.5 nm (no preconditioning, 100◦C HfOx ) and (c) 0.5 nm (no preconditioning, 200◦C HfOx ). A spectrum was acquired where the HfOx overlapped the MoS2 (MoS2 region) and where the TMD was absent (SiO2 region). (d) Correlation between shift in binding ener… view at source ↗
Figure 6
Figure 6. Figure 6: XPS-spectra of the Ta 4f5/2 and Ta 4f7/2 for devices undergoing separate Ta-seed deposition processes: (a) 0.2 nm, preconditioning, 0.1 ˚A/s and (b) 0.5 nm no preconditioning, 0.2 ˚A/s. The spectra exhibit two primary Ta chemical environments: a higher-binding-energy doublet consistent with Ta2O5 , and a lower-binding-energy doublet attributed to an interfa￾cial and/or sub-stoichiometric TaOx component. Th… view at source ↗
read the original abstract

Integrating two-dimensional semiconductors such as MoS$_2$ with dielectric materials remains a central challenge for their use in future logic technologies. While seed layers are typically introduced to promote dielectric nucleation and adhesion, we show that they also critically govern charge-transfer doping and, in turn, transistor performance. Back-gated monolayer MoS$_2$ transistors passivated on their top-surface with a Ta-seed/HfO$_x$ dielectric stack were fabricated and characterized electrically and physically using Raman, photoluminescence, and X-ray photoelectron spectroscopies. Threshold voltage and on-current varied strongly with Ta-seed thickness and deposition conditions, and these changes correlated with signatures observed across all spectroscopic probes. The results reveal that the seed layer both introduces disorder into the MoS$_2$ channel and modifies the interfacial charge environment controlling charge transfer between HfO$_x$ and MoS$_2$. Optical spectroscopy shows that on-current tracks seed-induced disorder, whereas X-ray photoelectron spectroscopy indicates that threshold voltage correlates with shifts in the local electrostatic environment associated with interfacial charge transfer. Better performance was obtained with ultrathin 0.2 nm Ta seed layers deposited under oxygen-poor conditions, which limit deposition-induced damage while facilitating charge transfer. These findings identify seed-layer engineering as a key strategy for controlling disorder and interfacial doping in MoS$_2$ devices and establish multimodal spectroscopy as a practical during-fabrication approach for process development and monitoring.

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 / 2 minor

Summary. The paper claims that Ta seed layers in HfOx dielectric stacks on back-gated monolayer MoS2 transistors govern both channel disorder and interfacial charge transfer, thereby controlling threshold voltage and on-current. Electrical trends with seed thickness and oxygen deposition conditions are shown to correlate with Raman, photoluminescence, and XPS signatures, with optimal performance obtained using 0.2 nm Ta seeds deposited under oxygen-poor conditions. The work positions seed-layer engineering as a strategy for doping control and multimodal spectroscopy as a monitoring tool during fabrication.

Significance. If the central interpretation holds, the results identify a tunable handle for charge-transfer doping in 2D semiconductor devices that goes beyond the conventional nucleation role of seed layers. This could aid integration of MoS2 with high-k dielectrics for logic applications and demonstrates the value of combining electrical and spectroscopic probes for process optimization.

major comments (2)
  1. [Abstract] Abstract: the central claim that seed thickness and oxygen conditions directly set Vth and Ion via disorder and interfacial charge transfer rests on observed correlations, yet the abstract provides no description of control samples or explicit isolation of seed deposition from other fabrication steps (HfOx nucleation, post-deposition anneals, contact formation). Without such controls, alternative explanations from uncontrolled process variables cannot be excluded and the causality interpretation remains under-supported.
  2. [Abstract] Abstract: the reported strong variations in electrical metrics and spectroscopic signatures are presented without sample sizes, error bars, or data-exclusion criteria. This omission makes it difficult to assess the statistical robustness of the trends that underpin the claim of seed-layer control over disorder and charge transfer.
minor comments (2)
  1. Notation for chemical formulas (MoS2, HfOx, Ta) should be made consistent throughout the text and figures.
  2. [Abstract] The term 'oxygen-poor conditions' would benefit from quantitative deposition parameters (e.g., O2 partial pressure or flow rate) to enable reproducibility.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We are grateful to the referee for their detailed review and valuable suggestions. Below we respond to each major comment and indicate the revisions made to the manuscript.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central claim that seed thickness and oxygen conditions directly set Vth and Ion via disorder and interfacial charge transfer rests on observed correlations, yet the abstract provides no description of control samples or explicit isolation of seed deposition from other fabrication steps (HfOx nucleation, post-deposition anneals, contact formation). Without such controls, alternative explanations from uncontrolled process variables cannot be excluded and the causality interpretation remains under-supported.

    Authors: We thank the referee for highlighting the need to better describe the experimental controls in the abstract. While the abstract is necessarily concise, the manuscript details that the MoS2 monolayer transfer, source/drain contact formation, and HfOx deposition were performed under identical conditions for all samples, with systematic variation only in the Ta seed layer thickness and the oxygen partial pressure during Ta deposition. This approach allows us to attribute the observed changes in Vth and Ion primarily to the seed layer. The correlations with Raman, PL, and XPS data provide additional evidence against alternative explanations from uncontrolled variables. We have updated the abstract to explicitly note that other fabrication steps were held constant, thereby strengthening the presentation of our causality argument. revision: yes

  2. Referee: [Abstract] Abstract: the reported strong variations in electrical metrics and spectroscopic signatures are presented without sample sizes, error bars, or data-exclusion criteria. This omission makes it difficult to assess the statistical robustness of the trends that underpin the claim of seed-layer control over disorder and charge transfer.

    Authors: We agree that including statistical information enhances the robustness assessment. In the revised version, we have included the number of devices characterized for each condition (n = 8-12 per seed thickness), added error bars to the plots of Vth and Ion versus seed thickness (representing one standard deviation), and specified in the methods that devices with visible defects or incomplete contacts were excluded from analysis. These changes are reflected in the updated figures and text. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental study with no derivations or fitted predictions

full rationale

The paper reports fabrication, electrical characterization, and multimodal spectroscopy (Raman, PL, XPS) of MoS2 transistors with varying Ta seed layers. All claims rest on direct correlations between seed thickness/conditions, threshold voltage, on-current, and spectroscopic signatures. No equations, no parameter fitting presented as prediction, no self-citations invoked as uniqueness theorems or ansatzes, and no renaming of known results as new derivations. The central interpretation (seed-induced disorder plus interfacial charge transfer) is an inference from measurements rather than a reduction to prior inputs by construction, rendering the work self-contained.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on standard interpretations of Raman/PL for disorder and XPS for interfacial charge shifts; no free parameters, ad-hoc axioms, or new entities are introduced beyond routine materials-science assumptions.

axioms (2)
  • domain assumption Raman and photoluminescence peak shifts and broadening reliably indicate structural disorder in monolayer MoS2
    Invoked when linking optical spectra to seed-induced damage
  • domain assumption XPS core-level shifts reflect changes in the local electrostatic environment due to interfacial charge transfer
    Invoked when correlating threshold voltage with XPS data

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discussion (0)

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Reference graph

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