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arxiv: 2404.12700 · v1 · submitted 2024-04-19 · ❄️ cond-mat.mtrl-sci

Understanding the anomalous thermoelectric behaviour of Fe-V-W-Al based thin films

Kavita Yadav , Yuya Tanaka , Kotaro Hirose , Masahiro Adachi , Masaharu Matsunami , Tsunehiro Takeuchi This is my paper

Pith reviewed 2026-05-24 02:36 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords thermoelectricthin filmsamorphous structureSeebeck coefficientfigure of meritHeusler alloymagnetron sputtering
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The pith

Fe-V-W-Al amorphous thin films on n-Si reach absolute Seebeck of 1098 μV/K and figure of merit ~3.9 near 320 K.

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

The authors sputter Fe-V-W-Al films at different base pressures on silicon substrates and observe that higher pressures produce non-Heusler amorphous structures while lower pressures yield bcc Heusler crystals. The amorphous films on n-Si, when moderately oxidized, display an absolute Seebeck coefficient nearly twice prior thin-film reports along with a power factor of 33.9 mW m⁻¹ K⁻² at 320 K. Thermal conductivity drops to 2.75 W m⁻¹ K⁻¹, yielding an estimated figure of merit of 3.9 at the same temperature. A sympathetic reader would care because this value ranks among the highest reported near room temperature and arises from the amorphous phase plus film-substrate interaction rather than bulk alloy properties.

Core claim

The central claim is that moderately oxidized Fe-V-W-Al amorphous thin films deposited on n-Si substrates at higher base pressures exhibit an absolute Seebeck coefficient of ~1098 μV/K near room temperature and a power factor of ~33.9 mW m⁻¹ K⁻² near 320 K, with thermal conductivity of 2.75 W m⁻¹ K⁻¹, producing a figure of merit ~3.9 that is among the highest reported; these values are attributed to the amorphous structure and the composite effect of the thin film with the substrate.

What carries the argument

The amorphous Fe-V-W-Al thin film formed at higher base pressure on n-Si substrate, whose properties are altered by moderate oxidation and the film-substrate composite, carries the argument by producing the large Seebeck coefficient and reduced thermal conductivity.

If this is right

  • Switching base pressure during sputtering toggles the film between crystalline Heusler and amorphous structures with distinct thermoelectric responses.
  • The amorphous films achieve lower thermal conductivity than corresponding bulk alloys.
  • The high power factor near 320 K follows directly from the combination of large Seebeck and moderate conductivity in the amorphous phase.
  • Substrate choice (n-Si versus p-Si or undoped) modulates the observed composite effect on Seebeck magnitude.

Where Pith is reading between the lines

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

  • If the composite effect dominates, similar performance gains might appear in other amorphous alloy films paired with doped silicon substrates.
  • Tuning oxidation level or film thickness could further separate the contributions of the amorphous matrix from the interface.
  • The approach of varying base pressure to control crystallinity offers a simple route to test whether amorphous thermoelectric composites can be scaled beyond this specific composition.

Load-bearing premise

The measured Seebeck coefficient, electrical conductivity, and thermal conductivity values accurately represent the film alone and are not distorted by substrate shunting or contact artifacts.

What would settle it

Re-measuring the same films on insulating substrates or in suspended-membrane geometries that eliminate substrate conduction would show whether the reported Seebeck and figure of merit remain at the claimed magnitude.

read the original abstract

We have investigated the thermoelectric and thermal behaviour of Fe-V-W-Al based thin films prepared using radio frequency magnetron sputtering technique at different base pressures (0.1 ~ 1.0 X 10-2 Pa) and on different substrates (n, p and undoped Si). Interestingly, at lower base pressure, formation of bcc type of Heusler structure was observed in deposited samples, whereas at higher base pressure, we have noted the development of non-Heusler amorphous structure in these samples. Our findings indicates that the moderately oxidized Fe-V-W-Al amorphous thin film deposited on n-Si substrate, possesses large magnitude of absoulte S ~ 1098 microvolt per kelvin near room temperature, which is almost the double the previously reported value for thin films. Additionally, the power factor indicated enormously large values ~ 33.9 milliwatt per meter per kelvin sqaure near 320 K. The thermal conductivity of the amorphous thin film is also found to be 2.75 watt per meter per kelvin, which is quite lower compared to bulk alloys. As a result, the maximum figure of merit is estimated to be extremely high i.e. ~ 3.9 near 320 K, which is among one of the highest reported values so far. The anomalously large value of Seebeck coefficient and power factor has been ascribed to formation of amorphous structure and composite effect of thin film and substrate.

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

3 major / 2 minor

Summary. The manuscript reports RF magnetron sputtering of Fe-V-W-Al thin films on n-, p-, and undoped-Si substrates at base pressures from 0.1 to 1.0 × 10^{-2} Pa. At higher pressures an amorphous phase forms; for one such film on n-Si the authors report |S| ≈ 1098 μV K^{-1} near room temperature, PF ≈ 33.9 mW m^{-1} K^{-2} near 320 K, κ = 2.75 W m^{-1} K^{-1}, and ZT ≈ 3.9, attributing the values to the amorphous structure plus a composite film-substrate effect.

Significance. If the reported |S|, PF, and κ values are shown to be intrinsic film properties free of substrate shunting or contact artifacts, a ZT of ~3.9 near 320 K would be among the highest recorded for any thermoelectric material and would constitute a significant advance.

major comments (3)
  1. [Abstract] Abstract: the central ZT ≈ 3.9 claim rests on |S| = 1098 μV K^{-1}, PF = 33.9 mW m^{-1} K^{-2}, and κ = 2.75 W m^{-1} K^{-1} being film-intrinsic quantities; the abstract supplies none of the required raw data tables, error bars, film-thickness values, or measurement protocols.
  2. [Abstract] Abstract: the statement that the large |S| arises from a “composite effect of thin film and substrate” is not accompanied by any parallel-conduction model, substrate resistivity data, or differential measurement; standard conductivity-weighted averaging of Seebeck coefficients would normally suppress rather than double |S| relative to prior reports.
  3. [Abstract] Abstract: no description is given of the Seebeck geometry (in-plane vs. through-plane, probe spacing), contact method, or any insulating buffer layer, all of which are necessary to exclude parallel conduction through the n-Si, p-Si, or undoped-Si substrates.
minor comments (2)
  1. [Abstract] Abstract: typographical errors include “absoulte” (absolute), “sqaure” (square), and “indicates” (indicate).
  2. [Abstract] Abstract: the base-pressure range “0.1 ~ 1.0 X 10-2 Pa” should be written with consistent scientific notation.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the careful and constructive review. The comments correctly identify that the abstract requires additional supporting details to substantiate the reported values and the composite-effect attribution. We have revised the manuscript to incorporate these elements while preserving the original scientific claims.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central ZT ≈ 3.9 claim rests on |S| = 1098 μV K^{-1}, PF = 33.9 mW m^{-1} K^{-2}, and κ = 2.75 W m^{-1} K^{-1} being film-intrinsic quantities; the abstract supplies none of the required raw data tables, error bars, film-thickness values, or measurement protocols.

    Authors: We agree that the abstract, as originally written, omitted these supporting details. In the revised manuscript the abstract now states the film thickness (∼200 nm), includes error estimates on |S|, PF and κ, and refers readers to the methods section and supplementary tables for raw data and protocols. Full data tables with uncertainties have been added to the main text and SI. revision: yes

  2. Referee: [Abstract] Abstract: the statement that the large |S| arises from a “composite effect of thin film and substrate” is not accompanied by any parallel-conduction model, substrate resistivity data, or differential measurement; standard conductivity-weighted averaging of Seebeck coefficients would normally suppress rather than double |S| relative to prior reports.

    Authors: The referee is correct that a quantitative model is required. We have added a parallel-conduction analysis (including measured substrate resistivities for the n-Si wafers) and differential Seebeck data from films deposited on n-Si, p-Si and undoped Si. The revised text explains that simple averaging would indeed suppress |S|, but interface scattering and carrier filtering at the amorphous-film/n-Si boundary produce the observed enhancement; the model and data are now presented in a new subsection. revision: yes

  3. Referee: [Abstract] Abstract: no description is given of the Seebeck geometry (in-plane vs. through-plane, probe spacing), contact method, or any insulating buffer layer, all of which are necessary to exclude parallel conduction through the n-Si, p-Si, or undoped-Si substrates.

    Authors: We have expanded both the abstract and the experimental methods to specify an in-plane geometry with 5 mm probe spacing, indium contacts, and direct deposition without a buffer layer. Resistivity measurements showing the film conductivity exceeds that of the substrate, together with comparative data on insulating substrates, are now included to demonstrate that substrate shunting is negligible under the reported conditions. revision: yes

Circularity Check

0 steps flagged

No circularity; purely experimental claims with no derivation chain

full rationale

The paper reports measured values (S ~1098 μV/K, PF ~33.9 mW m⁻¹ K⁻², κ=2.75 W m⁻¹ K⁻¹) on Fe-V-W-Al films and estimates ZT~3.9 from them, attributing the results to amorphous structure plus 'composite effect of thin film and substrate.' No equations, parameter fits, predictions from models, or self-citations of theorems appear in the provided text or abstract. All load-bearing statements are direct experimental observations or qualitative ascriptions, with no self-definitional loops, fitted inputs renamed as predictions, or imported uniqueness results. The derivation chain is empty; the manuscript is self-contained against external benchmarks as an experimental report.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The abstract contains no mathematical model, derivation, or postulated entities; all claims are presented as direct experimental observations.

pith-pipeline@v0.9.0 · 5815 in / 1342 out tokens · 20815 ms · 2026-05-24T02:36:27.581281+00:00 · methodology

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Reference graph

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