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REVIEW 3 major objections 5 minor 63 references

Highly Sensitive, Fast Graphene Photodetector with Responsivity $>10^6$ A/W Using Floating Quantum Well Gate

T0 review · 3 major / 5 minor · reviewed 2026-08-14 · deepseek-v4-flash

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Pith's one-line read A graphene photodetector reaches 4.4 million A/W sensitivity

desk verdict A genuinely new photogating device that could be important, but the headline responsivity depends on an uncalibrated 30 fW power, so the central number is not yet trustworthy. read the letter →

arxiv 1908.06924 v1 pith:NTGZ4E7G submitted 2019-08-19 physics.app-ph cond-mat.mes-hallcond-mat.mtrl-sci

Krishna Murali , Nithin Abraham , Sarthak Das , Sangeeth Kallatt , Kausik Majumdar This is my paper · ORCID
classification physics.app-phcond-mat.mes-hallcond-mat.mtrl-sci PACS 85.60.Gz73.50.Pz
keywords graphenephotodetectorphotogatingfloatingquantumwellMoS2WS2vanderWaalsheterojunctionresponsivitynoiseequivalentpower
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This paper claims that a vertical stack of few-layer graphene on bilayer WS2 on monolayer MoS2 detects light with a sensitivity that outperforms every previously reported graphene-absorption-based photodetector by several orders of magnitude. The design keeps graphene as both the light absorber and the conduction channel, while a fraction of photoexcited electrons transfer rapidly into a floating MoS2 quantum well that electrostatically gates the graphene and amplifies the photocurrent. The authors report a responsivity of $4.4\times 10^6$ A/W at 30 fW incident power, a noise equivalent power below 4 fW/$\sqrt{\mathrm{Hz}}$, and millisecond-scale response with no lingering photocurrent. If the claim holds, graphene-based detectors become viable for low-intensity, broadband, room-temperature photodetection without slow recovery or refresh circuitry.

What carries the argument

The load-bearing object is the vertical van der Waals heterojunction few-layer graphene / bilayer WS2 / monolayer MoS2, where the monolayer MoS2 acts as a floating quantum well gate for the graphene channel. The mechanism is quantum-confined photogating: ultrafast interlayer electron transfer from graphene into the MoS2 quantum well builds a stored electron population that shifts the graphene Dirac point and changes its conductance, giving high photoconductive gain. The thin WS2 layer controls both the injection rate into the well and the tunnel-back rate to graphene, and the conduction-band offset between MoS2 and graphene provides a built-in field that swiftly empties the well when light is turned off. The argument is carried by a coupled rate-equation model for the photoinduced carrier density in graphene, the electron density in the MoS2 conduction band, and the trapped-carrier density in MoS2, with parameters fitted to reproduce the responsivity-versus-power curve.

What would settle it

Measure the actual optical power at the junction using a calibrated power meter and a beam spot that is fully mapped relative to the 6 $\mu$m$^2$ active area, then recompute the responsivity; if the true power is ten times higher, the headline $4.4\times 10^6$ A/W drops to about $4\times 10^5$ A/W. Independent reproduction of the FLG/WS2/MoS2 stack with the same measurements would also decide whether the device performs as claimed.

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Extended reading notes

Core claim

The central discovery is that a floating monolayer MoS2 quantum well, coupled to a few-layer graphene channel through an ultrathin WS2 spacer, produces a quantum-confined photogating effect strong enough to give a measured responsivity of $4.4\times 10^6$ A/W at 30 fW incident power (851 nm) and a noise equivalent power below 4 fW/$\sqrt{\mathrm{Hz}}$, while the built-in band offset discharges the MoS2 rapidly when illumination stops, giving response times under 10 ms with zero reminiscent photocurrent. The paper frames this as the first time a graphene-absorption detector simultaneously achieves ultra-high responsivity, low noise, and fast, self-restoring response at room temperature. A coupled rate-equation model with density-dependent recombination in graphene, interlayer transfer in both directions, and trapping in MoS2 reproduces the measured responsivity over 11 orders of magnitude of incident power density.

Load-bearing premise

The claim depends on the accuracy of the optical power stated as falling on the 6 $\mu$m$^2$ junction; the paper does not report power-meter calibration, beam spot size relative to the junction, or measurement uncertainty, so if the true power at the junction is larger than stated, the responsivity is proportionally lower.

Editorial extensions

If this is right

  • Graphene-absorption photodetectors can reach sensitivities that rival detectors with separate absorbing layers, while preserving graphene's broadband absorption from the visible to the near-infrared.
  • The automatic discharge mechanism removes the need for the gate-voltage refresh pulses used in earlier photogating detectors, simplifying the system.
  • With NEP below 4 fW/$\sqrt{\mathrm{Hz}}$ and response times under 10 ms, the device is practical for room-temperature low-light sensing in the near-infrared.
  • Because the responsivity follows a single trend line across 532 to 1050 nm, the photogating mechanism should extend across the full graphene absorption band.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The fitted model's slow de-trapping time ($\tau_{TM} \gg \tau_{MG}$) implies that MoS2 defect states dominate the gain at low power, so engineering the defect density in MoS2 should tune the responsivity; this is a testable prediction.
  • At 30 fW with SNR near 10, the device is approaching the few-hundred-photon-per-second regime; whether it can be pushed toward single-photon detection depends on reducing the dark current noise further and on the exact optical power calibration.
  • The same floating-quantum-well architecture could be transferred to other transition-metal-dichalcogenide pairs with suitable band offsets, and if graphene remains the absorber, the principle should hold at longer wavelengths than the TMD bandgaps.
  • The absolute responsivity values should be read as upper bounds until the optical power at the junction is independently calibrated; the relative comparison across wavelengths is less sensitive to that uncertainty.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The manuscript reports a vertical FLG/2L-WS2/1L-MoS2 heterojunction photodetector in which photoexcited electrons in few-layer graphene transfer to a monolayer MoS2 quantum well, producing a photogating effect. The authors report a responsivity of 4.4×10^6 A/W at 30 fW incident power at 851 nm, an NEP < 4 fW/√Hz, response times below 10 ms, and no persistent photocurrent. They support the mechanism with temperature-dependent PL quenching measurements and a rate-equation model with fitted parameters.

Significance. If the performance figures are reproducible, the detector would represent a substantial advance over graphene-absorption photodetectors, combining high gain with millisecond-scale response. The PL experiments provide direct evidence of carrier storage in MoS2, and the fabrication of two devices (D1, D2) with consistent behavior is a strength. The principal issue is that the headline responsivity and NEP rest on an uncalibrated optical power value at the junction; until that is documented, the magnitude of the claimed improvement is not verifiable.

major comments (3)
  1. [§2.4, Fig. 5a and Eq. (6)] The paper does not describe how the 30 fW optical power falling on the 6 µm² junction was determined. The text states only that this is the smallest power 'incident on the junction' during the experiment, with no details of the calibration chain (e.g., attenuator accuracy, beam spot size relative to the junction, power meter traceability). Because R = Iph/Pop and NEP = NRMS/R, any error in Pop propagates linearly into both headline figures; a factor-of-10 underestimate would reduce R to 4.4×10^5 A/W. The authors must provide a complete optical calibration description and an uncertainty estimate.
  2. [§2.4, Eqs. (1)-(4) and Fig. 5a] The 'model predicted' responsivity curve is obtained by fitting three free parameters (τMG/τGM=10, τMT/τTM=5×10^-4, NT=5×10^10 cm^-2), and the internal quantum efficiency η is not assigned a value. The agreement over 11 orders of magnitude is therefore a demonstration of the model's flexibility, not an independent prediction. The manuscript should either determine these parameters independently or clearly label the curve as a fit and discuss the sensitivity of the conclusion to the fitted values.
  3. [Fig. 5a and Fig. 5c] None of the measured responsivity or SNR data points carry error bars, and the NEP of <4 fW/√Hz is derived from a single SNR measurement (SNR≈10 at 30 fW). The authors should provide repeated measurements or a statistical uncertainty analysis to support the stated performance margins.
minor comments (5)
  1. [Throughout] The term 'reminiscent photocurrent' is used; the standard term is 'persistent photocurrent'.
  2. [§2.4, Eq. (4)] The text says 'Plank constant'; it should be 'Planck constant'.
  3. [Fig. 5a and Fig. 5c] The x-axis of Fig. 5a is 'Power Density (W/m^2)' while Fig. 5c and the text use 'Power (W)'; the conversion between the two, based on the 6 µm² junction area, should be stated explicitly.
  4. [§2.3] The exclusion of direct sub-bandgap absorption in MoS2/WS2 is argued from noise and transient response; a direct measurement such as photocurrent excitation spectroscopy below the bandgap would strengthen this conclusion.
  5. [§2.3, Fig. 4c-e] The rise and fall times are reported as <10 ms and stated to be limited by the measurement equipment; the bandwidth of the measurement setup should be specified to make this bound meaningful.

Circularity Check

1 steps flagged · score 6.0 of 10

Partial circularity: the rate-equation 'model predicted' responsivity in Fig. 5a is a three-parameter fit to the same measured R(Pop) curve; the headline 4.4e6 A/W responsivity is a direct measurement and remains independent, though its optical-power calibration is undocumented.

  1. fitted input called prediction [Section 2.4 'Performance evaluation, modeling, and benchmarking', Eqs. (1)-(4) and Fig. 5a caption]
    "The orange curve is the simulated responsivity with fitting parameters τMG/τGM = 10, τMT/τTM = 5×10−4, and NT = 5×10^10 cm-2. ... The simulated results follow the experimentally obtained R remarkably well over 11 orders of magnitude of incident optical power density."

    The three parameters (τMG/τGM, τMT/τTM, NT) are the fitting knobs of Eq. (4). Once they are tuned to the measured R-versus-power data, evaluating Eq. (4) on the same power axis and calling the result 'model predicted responsivity' (Fig. 5a caption) presents a fit as a prediction. The 11-order agreement is a statement about the fit quality, not about an independent forecast. This does not affect the direct experimental R = Iph/Pop, which is measured rather than derived, so the circularity is confined to the model-validation narrative.

full rationale

The central empirical claims—4.4×10^6 A/W responsivity at 30 fW, NEP < 4 fW/√Hz, and millisecond response—are direct measurements of photocurrent and quoted optical power, not outputs of the rate-equation model. The only load-bearing reduction-by-construction is in Section 2.4: the model described by Eqs. (1)-(4) uses fitted ratios τMG/τGM = 10, τMT/τTM = 5×10−4, and NT = 5×10^10 cm−2, and the resulting orange curve is labeled 'model predicted.' Since the parameters were chosen to reproduce the measured R(Pop), the claimed 11-order-of-magnitude agreement is a fit-quality statement, not a prediction. There is no significant self-citation load-bearing chain: the cited prior Majumdar-group work (Ref. 53) is used for exciton binding energy modulation and is not central to the photodetector claim. A separate concern is the undocumented optical power calibration at the junction: because R and NEP are inversely proportional to Pop, a factor-of-10 error in the stated 30 fW would collapse the headline responsivity. This is an experimental correctness risk, not a circularity of the derivation chain. Overall score reflects the partial circularity of the model-validation claim while the empirical device result remains independent.

Assumptions & free parameters 4 free parameters · 4 assumptions · 0 invented entities

The central claim rests on measured device data, but the mechanism explanation relies on a rate-equation model with four free parameters, three of which are fitted to the measured responsivity curve. The paper introduces no new physical entities; the floating MoS2 quantum well is a known material structure used in a new device role.

free parameters (4)
  • τMG/τGM = 10
    Ratio of back-transfer to forward-transfer times between MoS2 and graphene; adjusted to fit the responsivity vs power curve in Fig. 5a.
  • τMT/τTM = 5×10^-4
    Ratio of trapping to de-trapping times in MoS2; adjusted to fit the low-power slope of the responsivity curve.
  • NT = 5×10^10 cm^-2
    Trap state density in MoS2; adjusted to position the knee in the responsivity vs power curve.
  • η = not stated (likely assumed 1)
    Internal quantum efficiency of few-layer graphene absorption; appears in Eq. (1) but its value is not given in the paper.
assumptions (4)
  • domain assumption Rate equations in Eq. (1)-(3) with linear transfer and a single trap level capture the device physics.
    The model assumes uniform carrier densities and a single trap level in MoS2; no validation from independent measurements.
  • domain assumption Ultrafast inter-layer electron transfer from graphene to MoS2 occurs before recombination in graphene.
    Borrowed from prior time-resolved measurements in similar van der Waals heterostructures (refs 47-50); used to justify photogating.
  • domain assumption In steady state, there is no net charge flow between graphene and MoS2 because MoS2 is a floating gate.
    This condition is used to derive ΔnG = ηφτr and the stored charge expressions, but it is not independently verified in the device.
  • ad hoc to paper Sub-bandgap excitation does not directly excite defects in MoS2/WS2, and the low noise and fast response rule out such absorption.
    The argument in §2.3 is indirect and based on the absence of slow decay, not on a direct measurement of defect absorption.

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Cite this review

Pith. "Pith review of Highly Sensitive, Fast Graphene Photodetector with Responsivity $>10^6$ A/W Using Floating Quantum Well Gate." pith.science (2026). https://pith.science/paper/NTGZ4E7G

@misc{pith2026190806924,
  author       = {Pith},
  title        = {Pith review of: Highly Sensitive, Fast Graphene Photodetector with Responsivity $>10^6$ A/W Using Floating Quantum Well Gate},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/NTGZ4E7G}},
  note         = {Machine review of arXiv:1908.06924}
}
abstract

Graphene, owing to its zero bandgap electronic structure, is promising as an absorption material for ultra-wideband photodetection applications. However, graphene-absorption based detectors inherently suffer from poor responsivity due to weak absorption and fast photocarrier recombination, limiting their viability for low intensity light detection. Here we use a graphene/WS$_2$/MoS$_2$ vertical heterojunction to demonstrate a highly sensitive photodetector, where the graphene layer serves dual purpose, namely as the light absorption layer, and also as the carrier conduction channel, thus maintaining the broadband nature of the photodetector. A fraction of the photoelectrons in graphene encounter ultra-fast inter-layer transfer to a floating monolayer MoS$_2$ quantum well providing strong quantum confined photogating effect. The photodetector shows a responsivity of $4.4\times 10^6$ A/W at 30 fW incident power, outperforming photodetectors reported till date where graphene is used as light absorption material by several orders. In addition, the proposed photodetector exhibits an extremely low noise equivalent power ($N\!E\!P$) of $<4$ fW/$\sqrt{Hz}$ and a fast response ($\sim$ milliseconds) with zero reminiscent photocurrent. The findings are attractive towards the demonstration of graphene-based highly sensitive, fast, broadband photodetection technology.

Figures

Figures reproduced from arXiv: 1908.06924 by the authors.

Figure 1
Figure 1. Proposed photodetector and principle of operation. (a) Schematic view of the proposed vertical heterojunction device structure. (b) Schematic view of the cross section of the proposed device showing inter-layer transfer of electrons from few layer graphene (FLG) to MoS2 quantum well under illumination, causing photogating effect. (c) Band diagram along the vertical direction depicting electron exchange between FLG a… view at source ↗
Figure 2
Figure 2. Evidence of carrier storage in MoS2 quantum well. (a) Optical image of a FLG/1L-WS2/1L-MoS2 vertical stack, with isolated portions as controls. Perimeter of each layer is shown by dashed lines. (b) Raman spectra of isolated monolayer regions along with the junction (FLG/1L WS2/1L MoS2) with 532 nm laser excitation. (c-d) PL intensity (in log scale) of the three regions with 532 nm laser excitation at (c) 150 K and (… view at source ↗
Figure 3
Figure 3. FLG/2L-WS2/1L-MoS2 photodetector fabrication. (a) Process flow for FLG/2L-WS2/1L-MoS2 photodetector fabrication with corresponding optical images at dif￾ferent stages in the bottom row. Scale bar is 5 µm. (b) PL spectra of 2L-WS2, 1L-MoS2 and 2L-WS2/1L-MoS2 junction. I-WS2 and ILE indicate the indirect peak of WS2 and the inter-layer peak between WS2 and MoS2, respectively. (c) The band alignment of 2L￾WS2/1L-MoS2 a… view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: Characteristics of FLG/2L-WS2/1L-MoS2 photodetector. (a) Id-Vg plot for FLG under dark condition with Vd = 0.5 V. Point P1 (red, solid circle) shows device operating point under dark condition at zero Vg which shifts to point P2 (red, open circle) under illumination. I…
Figure 5
Figure 5. Figure 5: Performance of FLG/2L-WS2/1L-MoS2 photodetector. (a) Measured (symbols) responsivity versus incident optical power density plot with varying wavelengths. At the minimum power density, the extracted responsivity is 4.4 × 106 A/W. Solid lines in orange and blue represent…

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Pith tools

Reviewed August 14, 2026 · model on record in the stance chip above.