Initial Development of MBE-Grown InAs Diodes for Thermoradiative Energy Harvesting

A. Mart\'i; I. Artacho; I. Ramiro

arxiv: 2605.03840 · v1 · submitted 2026-05-05 · ❄️ cond-mat.mtrl-sci

Initial Development of MBE-Grown InAs Diodes for Thermoradiative Energy Harvesting

I. Artacho , I. Ramiro , A. Mart\'i This is my paper

Pith reviewed 2026-05-07 15:35 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci

keywords InAsmolecular beam epitaxythermoradiative energy harvestingp-i-n diodereverse saturation currentbreakdown voltageMBE growthradiative limit

0 comments

The pith

MBE-grown InAs p-i-n diodes achieve breakdown voltages above 0.3 V and reverse saturation currents 200 times the radiative limit under optimized growth conditions.

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

The paper describes the development of indium arsenide p-i-n diodes fabricated by molecular beam epitaxy for use in thermoradiative energy harvesting. The work tests different substrate temperatures, arsenic fluxes, and indium cell settings to reduce leakage while maintaining junction integrity. Optimal parameters of 450 C growth temperature, arsenic flux at three times stoichiometry, and indium tip 150 C hotter than base yield devices with the reported electrical performance on 1x1 mm2 chips. A reader would care because thermoradiative diodes could turn waste heat or ambient radiation into electricity if their dark currents stay low enough to allow net power extraction in reverse bias.

Core claim

P-i-n diode structures grown at 450 C, with As2 flux around 3 times stoichiometry and an In effusion cell tip temperature 150 C higher than the base temperature, exhibit the best results with breakdown voltages above 0.3 V and reverse saturation current densities 200 times the radiative limit.

What carries the argument

The p-i-n InAs diode junction formed by molecular beam epitaxy with tuned flux and temperature offsets to limit non-radiative paths and control breakdown.

If this is right

The identified growth recipe supplies a reproducible starting point for making InAs diodes intended for radiative heat-to-electricity conversion.
Devices with breakdown above 0.3 V can operate in the low-bias reverse regime required for thermoradiative cells without immediate failure.
A reverse current density 200 times the radiative limit sets a practical benchmark that future growth runs can aim to reduce.
The 1x1 mm2 diode size allows direct electrical testing and potential integration into small-scale harvesting prototypes.

Where Pith is reading between the lines

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

Lowering the excess current closer to the radiative limit would directly raise the maximum convertible power from a given thermal radiation flux.
Repeating the same temperature and flux settings on different MBE systems would test whether the recipe transfers without additional defects.
Pairing these diodes with wavelength-selective coatings could improve optical coupling to thermal sources and raise overall system output.
Extending the characterization to include optical absorption spectra would link the electrical results to the infrared wavelengths relevant for thermoradiative operation.

Load-bearing premise

That reverse saturation currents 200 times the radiative limit and breakdown voltages above 0.3 V are high enough to enable working thermoradiative harvesting devices.

What would settle it

Building a full thermoradiative cell with these diodes and measuring net electrical power output under a controlled temperature difference between the diode and a thermal emitter.

read the original abstract

We describe the development of 1x1 mm2 InAs thermoradiative diodes grown by molecular beam epitaxy with emphasis on their reverse saturation current and break-down voltage. P-i-n diode structures grown at 450 C, with As2 flux around 3 times stoichiometry and an In effusion cell tip temperature 150 C higher than the base temperature, exhibit the best results with breakdown voltages above 0.3 V and reverse saturation current densities 200 times the radiative limit.

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.

Desk Editor's Note private letter to a colleague

This reports a specific MBE recipe for InAs p-i-n diodes that hits breakdown above 0.3 V and reverse current 200 times the radiative limit, but never measures or calculates actual thermoradiative power output.

read the letter

The core result is straightforward: p-i-n InAs diodes grown at 450 °C with As2 flux roughly three times stoichiometric and the In cell tip 150 °C hotter than the base give the best numbers in their set, with breakdown voltages over 0.3 V and reverse saturation current densities about 200 times the radiative limit on 1x1 mm² devices. They present this as the outcome of trying different growth temperatures, flux ratios, and cell temperatures, and they tie the parameters directly to the measured electrical figures. That part is useful if you are trying to grow similar narrow-gap diodes yourself and want a concrete starting point rather than starting from scratch on the MBE knobs. The work is honest about being initial development and sticks to direct measurements instead of fitted models or self-referential predictions. The citation pattern looks light but appropriate for an early materials note; they are not claiming to have invented the material system. The main limitation is that the paper stops at diode characterization. There are no full I-V curves shown, no error bars or sample counts, and no comparison to earlier InAs diode literature, so it is hard to judge how much of an improvement the recipe actually is. More critically, there is no device-level power measurement or even a simple calculation of expected net power under a temperature difference, so the link to thermoradiative harvesting remains untested. The 200-times-radiative-limit current may or may not allow positive extraction once you account for the full thermal gradient and parasitic losses; the manuscript does not address that. Reproducibility across runs is also not discussed. This is the kind of paper that matters to a small group already working on thermoradiative cells or on MBE of InAs-based structures. A reader in that niche can extract the growth parameters and try them, but it will not move the broader field much until someone shows actual energy-harvesting output or at least models the efficiency ceiling with these numbers. I would send it to peer review rather than desk-reject, mainly because the experimental details are concrete and the claims are modest, but I would ask the authors to add either a power estimate or a few more devices with statistics before acceptance.

Referee Report

3 major / 2 minor

Summary. The manuscript reports the initial development of 1×1 mm² InAs p-i-n diodes grown by molecular beam epitaxy (MBE) for thermoradiative energy harvesting applications. It focuses on correlating specific growth parameters—substrate temperature of 450 °C, As₂ flux ~3× stoichiometry, and In effusion cell tip temperature 150 °C above base—with measured electrical performance, claiming that these conditions produce the best diodes with breakdown voltages above 0.3 V and reverse saturation current densities 200 times the radiative limit.

Significance. If the reported growth window and electrical metrics can be reproduced and directly linked to positive net power extraction, the work would provide a practical starting recipe for InAs thermoradiative cells. The explicit parameter values and emphasis on reverse-bias characteristics represent a concrete experimental contribution in a materials-growth context, though the absence of device-level power measurements or efficiency estimates under a thermal gradient restricts the immediate significance for energy-harvesting applications.

major comments (3)

[Results] Results section (and abstract): The central claim that the specified MBE conditions yield the 'best results' with V_bd > 0.3 V and J_sat = 200× radiative limit is presented without error bars, run-to-run statistics, or sample size, and without full I-V curves. This leaves the reproducibility and statistical significance of the performance figures unquantified.
[Discussion] Discussion or application section: No calculation or measurement of net thermoradiative power density or conversion efficiency is provided under a temperature gradient. The manuscript therefore does not establish whether the reported 200× excess current and low breakdown voltage still permit positive power extraction, which is required to support the thermoradiative-harvesting motivation.
[Results] Results section: The reported metrics are not benchmarked against prior InAs p-i-n diodes in the literature or against the theoretical radiative limit in a device context. Without such comparisons, it is impossible to judge whether the achieved values represent meaningful progress toward functional harvesting devices.

minor comments (2)

[Abstract] The exact definition and temperature dependence of the 'radiative limit' used to normalize J_sat should be stated explicitly, including the assumed device area and temperature.
[Results] Inclusion of representative full I-V curves (forward and reverse) for the optimized growth conditions would substantially improve clarity and allow readers to assess the shape of the characteristics beyond the two summary numbers.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the thoughtful and constructive review. The comments highlight important aspects of statistical presentation, application relevance, and contextual benchmarking that we address point by point below. Revisions will be made to strengthen the manuscript accordingly.

read point-by-point responses

Referee: Results section (and abstract): The central claim that the specified MBE conditions yield the 'best results' with V_bd > 0.3 V and J_sat = 200× radiative limit is presented without error bars, run-to-run statistics, or sample size, and without full I-V curves. This leaves the reproducibility and statistical significance of the performance figures unquantified.

Authors: We agree that the initial submission would benefit from greater statistical detail. The reported metrics derive from measurements on multiple devices across several growth runs performed under the optimized conditions (450 °C, 3× As₂, elevated In temperature), but the manuscript emphasized parameter optimization over exhaustive statistics. In revision we will add representative full I-V curves, state the number of devices and wafers measured for each condition, and include error bars on the key figures of merit. As this remains an initial development study, the statistics will reflect the available data set rather than a large-scale campaign. revision: partial
Referee: Discussion or application section: No calculation or measurement of net thermoradiative power density or conversion efficiency is provided under a temperature gradient. The manuscript therefore does not establish whether the reported 200× excess current and low breakdown voltage still permit positive power extraction, which is required to support the thermoradiative-harvesting motivation.

Authors: The referee is correct that direct power-extraction measurements under a thermal gradient are absent, consistent with the scope of initial diode development. We will add a concise theoretical estimate in the revised discussion. Using the measured J_sat together with a model of radiative exchange and a modest temperature difference (e.g., 10–20 K), we will show the conditions under which net positive power density remains possible. This calculation will clarify that the observed excess current does not preclude harvesting while acknowledging that experimental validation lies beyond the present work. revision: yes
Referee: Results section: The reported metrics are not benchmarked against prior InAs p-i-n diodes in the literature or against the theoretical radiative limit in a device context. Without such comparisons, it is impossible to judge whether the achieved values represent meaningful progress toward functional harvesting devices.

Authors: We accept that explicit benchmarking is needed. The revised manuscript will include a short comparison table or paragraph placing our V_bd and J_sat values against representative literature reports on InAs p-i-n diodes. We will also relate the factor of 200× above the radiative limit to the requirements of thermoradiative cells, noting that this level is typical of early-stage narrow-gap devices and outlining routes for further reduction. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental measurements only, no derivation chain

full rationale

The paper reports MBE growth parameters for InAs p-i-n diodes and presents measured breakdown voltages (>0.3 V) and reverse saturation current densities (200× radiative limit) as direct experimental outcomes for specific recipes (450 °C, As2 flux ~3× stoichiometry, In tip +150 °C). No equations, models, fitted parameters, predictions, or self-citations are invoked as load-bearing steps. All quantities are stated as observed data compared against an external theoretical radiative limit, with no reduction of any claimed result to the paper's own inputs by construction. This is a standard experimental development report without any derivation chain.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The abstract relies on standard semiconductor physics for the concept of radiative limit and diode breakdown; no free parameters, ad-hoc axioms, or new entities are introduced.

axioms (1)

standard math The radiative limit represents the minimum reverse saturation current density set by thermal emission of photons in a semiconductor diode.
Used as the baseline for the reported 200-times factor.

pith-pipeline@v0.9.0 · 5381 in / 1309 out tokens · 45642 ms · 2026-05-07T15:35:27.828102+00:00 · methodology

discussion (0)

Reference graph

Works this paper leans on

21 extracted references · 21 canonical work pages

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Introduction Indium arsenide (InAs) is characterized by its low direct bandgap (0.35 eV at room temperature, [1]) and high electron mobility ( above 30,000 cm 2‧V‒1‧s‒1, [2]). With th ese parameters, r esearch into the development of InAs diodes was triggered in the past by their possible application in high-frequency, low- power dissipation electronics [...

work page
[2]

A solar cell converts into electricity part of the radiation energy emitted towards it by a hotter body

Thermoradiative diodes TR diodes are the counterpart of solar cells understood as thermal engines. A solar cell converts into electricity part of the radiation energy emitted towards it by a hotter body. A TR diode, instead, converts into electricity part of the energy that it would otherwise radiate to a colder environment. It is accepted that the limiti...

work page
[3]

To gain insight into the TR diode mode of operation, Fig

In addition: illumination from the sun has been simplified to that of a blackbody at temperature 𝑇𝑇𝑆𝑆; the cell is assumed to absorb all photons above the energy gap and, as it is customary for obtaining maximum efficiency, full solar concentration is assumed. To gain insight into the TR diode mode of operation, Fig. 1 illustrates (black curve) the ideal ...

work page
[4]

2 sketches the four InAs diode structures manufactured by molecular beam epitaxy (MBE) on a Veeco Gen 10

Description of the diode structures and results Fig. 2 sketches the four InAs diode structures manufactured by molecular beam epitaxy (MBE) on a Veeco Gen 10. Table I summarizes the MBE growth conditions. All the samples were grown on 2” InAs n+ (1,0,0) substrates, doped with S in the range 1‒3×10 18 cm‒3 according to their manufacturer (Wafer Technology ...

work page
[5]

These structures, particularly B15, show a flat reverse saturation current‒voltage characteristic, with negligible leakage current and breakdown voltage higher than 0.3 V

Conclusions The InAs diodes grown by MBE with pin structure provide a reasonable starting point for developing TR diodes for applications in which electricity is obtained from heat sources. These structures, particularly B15, show a flat reverse saturation current‒voltage characteristic, with negligible leakage current and breakdown voltage higher than 0....

work page
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MBE growth optimization of InAs (001) homoepitaxy,

H. Ye et al., “MBE growth optimization of InAs (001) homoepitaxy,” J. V ac. Sci. Technol. B Nanotechnol. Microelectron. Mater. Process. Meas. Phenom., vol. 31, no. 3, p. 03C135, May 2013, doi: 10.1116/1.4804397

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Little known MBE facts,

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InAs Device Process Development and Characterization:,

K. Ikossi, “InAs Device Process Development and Characterization:,” Defense Technical Information Center, Fort Belvoir, V A, May 2003. doi: 10.21236/ADA413747

work page doi:10.21236/ada413747 2003

[1] [1]

Introduction Indium arsenide (InAs) is characterized by its low direct bandgap (0.35 eV at room temperature, [1]) and high electron mobility ( above 30,000 cm 2‧V‒1‧s‒1, [2]). With th ese parameters, r esearch into the development of InAs diodes was triggered in the past by their possible application in high-frequency, low- power dissipation electronics [...

work page

[2] [2]

A solar cell converts into electricity part of the radiation energy emitted towards it by a hotter body

Thermoradiative diodes TR diodes are the counterpart of solar cells understood as thermal engines. A solar cell converts into electricity part of the radiation energy emitted towards it by a hotter body. A TR diode, instead, converts into electricity part of the energy that it would otherwise radiate to a colder environment. It is accepted that the limiti...

work page

[3] [3]

To gain insight into the TR diode mode of operation, Fig

In addition: illumination from the sun has been simplified to that of a blackbody at temperature 𝑇𝑇𝑆𝑆; the cell is assumed to absorb all photons above the energy gap and, as it is customary for obtaining maximum efficiency, full solar concentration is assumed. To gain insight into the TR diode mode of operation, Fig. 1 illustrates (black curve) the ideal ...

work page

[4] [4]

2 sketches the four InAs diode structures manufactured by molecular beam epitaxy (MBE) on a Veeco Gen 10

Description of the diode structures and results Fig. 2 sketches the four InAs diode structures manufactured by molecular beam epitaxy (MBE) on a Veeco Gen 10. Table I summarizes the MBE growth conditions. All the samples were grown on 2” InAs n+ (1,0,0) substrates, doped with S in the range 1‒3×10 18 cm‒3 according to their manufacturer (Wafer Technology ...

work page

[5] [5]

These structures, particularly B15, show a flat reverse saturation current‒voltage characteristic, with negligible leakage current and breakdown voltage higher than 0.3 V

Conclusions The InAs diodes grown by MBE with pin structure provide a reasonable starting point for developing TR diodes for applications in which electricity is obtained from heat sources. These structures, particularly B15, show a flat reverse saturation current‒voltage characteristic, with negligible leakage current and breakdown voltage higher than 0....

work page

[6] [6]

Vurgaftman, J

I. Vurgaftman, J. R. Meyer, and L. R. Ram-Mohan, “Band parameters for III–V compound semiconductors and their alloys,” J. Appl. Phys., vol. 89, no. 11, pp. 5815–5875, Jun. 2001, doi: 10.1063/1.1368156

work page doi:10.1063/1.1368156 2001

[7] [7]

Electron Mobility in Direct-Gap Polar Semiconductors,

D. L. Rode, “Electron Mobility in Direct-Gap Polar Semiconductors,” Phys. Rev. B, vol. 2, no. 4, pp. 1012–1024, 1970, doi: 10.1103/PhysRevB.2.1012

work page doi:10.1103/physrevb.2.1012 1970

[8] [8]

30-nm InAs pseudomorphic HEMTs on an InP substrate with a current-gain cutoff frequency of 628 GHz,

D.-H. Kim and J. A. del Alamo, “30-nm InAs pseudomorphic HEMTs on an InP substrate with a current-gain cutoff frequency of 628 GHz,” IEEE Electron Device Lett., vol. 29, no. 8, pp. 830–833, 2008, doi: 10.1109/LED.2008.2000794

work page doi:10.1109/led.2008.2000794 2008

[9] [9]

Solid state magnetic field sensors and applications,

J. Heremans, “Solid state magnetic field sensors and applications,” J. Phys. Appl. Phys., vol. 26, no. 8, pp. 1149–1168, 1993, doi: 10.1088/0022-3727/26/8/001

work page doi:10.1088/0022-3727/26/8/001 1993

[10] [10]

nBn detector, an infrared detector with reduced dark current and higher operating temperature,

S. Maimon and G. W. Wicks, “nBn detector, an infrared detector with reduced dark current and higher operating temperature,” Appl. Phys. Lett., vol. 89, no. 15, 2006, doi: 10.1063/1.2360235

work page doi:10.1063/1.2360235 2006

[11] [11]

InAs thermophotovoltaic cells with high quantum efficiency for waste heat recovery applications below 1000 °C,

Q. Lu et al., “InAs thermophotovoltaic cells with high quantum efficiency for waste heat recovery applications below 1000 °C,” Sol. Energy Mater. Sol. Cells, vol. 179, pp. 334–338, Jun. 2018, doi: 10.1016/j.solmat.2017.12.031. 7

work page doi:10.1016/j.solmat.2017.12.031 2018

[12] [12]

Large Area Near-Field Thermophotovoltaics for Low Temperature Applications,

J. Selvidge, R. M. France, J. Goldsmith, P. Solanki, M. A. Steiner, and E. J. Tervo, “Large Area Near-Field Thermophotovoltaics for Low Temperature Applications,” Adv. Mater., vol. 37, no. 5, p. 2411524, 2025, doi: 10.1002/adma.202411524

work page doi:10.1002/adma.202411524 2025

[13] [13]

Theoretical efficiency limits for thermoradiative energy conversion,

R. Strandberg, “Theoretical efficiency limits for thermoradiative energy conversion,” J. Appl. Phys., vol. 117, no. 5, p. 055105, Feb. 2015, doi: 10.1063/1.4907392

work page doi:10.1063/1.4907392 2015

[14] [14]

Detailed Balance Limit of Efficiency of p-n Junction Solar Cells,

W. Shockley and H. J. Queisser, “Detailed Balance Limit of Efficiency of p-n Junction Solar Cells,” J. Appl. Phys., vol. 32, no. 3, pp. 510–519, 1961

work page 1961

[15] [15]

Absolute limiting efficiencies for photovoltaic energy conversion,

G. L. Araujo and A. Marti, “Absolute limiting efficiencies for photovoltaic energy conversion,” Sol. Energy Mater. Sol. Cells, vol. 33, no. 2, pp. 213–240, 1994

work page 1994

[16] [16]

Photon recycling and Shockley’s diode equation,

A. Martí, J. L. Balenzategui, and R. F. Reyna, “Photon recycling and Shockley’s diode equation,” J. Appl. Phys., vol. 82, no. 8, pp. 4067–4075, 1997

work page 1997

[17] [17]

Optical dispersion relations for GaP, GaAs, GaSb, InP, InAs, InSb, Al x Ga1− x As, and In1− x Ga x As y P1− y,

S. Adachi, “Optical dispersion relations for GaP, GaAs, GaSb, InP, InAs, InSb, Al x Ga1− x As, and In1− x Ga x As y P1− y,” J. Appl. Phys., vol. 66, no. 12, pp. 6030–6040, Dec. 1989, doi: 10.1063/1.343580

work page doi:10.1063/1.343580 1989

[18] [18]

MBE growth optimization of InAs (001) homoepitaxy,

H. Ye et al., “MBE growth optimization of InAs (001) homoepitaxy,” J. V ac. Sci. Technol. B Nanotechnol. Microelectron. Mater. Process. Meas. Phenom., vol. 31, no. 3, p. 03C135, May 2013, doi: 10.1116/1.4804397

work page doi:10.1116/1.4804397 2013

[19] [19]

Braun, Applied RHEED: reflection high-energy electron diffraction during crystal growth

W. Braun, Applied RHEED: reflection high-energy electron diffraction during crystal growth. in Springer tracts in modern physics, no. v. 154. Berlin ; New York: Springer, 1999

work page 1999

[20] [20]

Little known MBE facts,

F. Bastiman, “Little known MBE facts,” MBE Blog (accessed 2025). [Online]. Available: https://faebianbastiman.wordpress.com/mbe-blog-contents-page/

work page 2025

[21] [21]

InAs Device Process Development and Characterization:,

K. Ikossi, “InAs Device Process Development and Characterization:,” Defense Technical Information Center, Fort Belvoir, V A, May 2003. doi: 10.21236/ADA413747

work page doi:10.21236/ada413747 2003