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arxiv: 2604.06294 · v1 · submitted 2026-04-07 · ❄️ cond-mat.mtrl-sci

Optoelectronic and Thermoelectric Properties of High-Performance AlSb Semiconductors

Dilshod Nematov , Amondulloi Burkhonzoda , Iskandar Raufov , Sherali Murodzoda , Saidjafar Murodzoda , Sakhidod Sattorzoda , Anushervon Ashurov , Makhsud Barot Islomzoda
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Kholmirzo Kholmurodov
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Pith reviewed 2026-05-10 19:00 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords AlSbquasi-direct bandgapoptoelectronic propertiesthermoelectric propertiesfirst-principlesmBJ+UIII-V semiconductorsdensity functional theory
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The pith

Both cubic and hexagonal AlSb act as quasi-direct bandgap semiconductors with gaps of 1.71 eV and 1.50 eV.

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

This work computes the structural, electronic, optical, and thermoelectric properties of AlSb in its cubic and hexagonal arrangements. It establishes that each phase has a quasi-direct band gap close to measured values once the antimony d-electron states are properly included in the model. Optical calculations indicate robust absorption of visible and ultraviolet light along with high refractive indices. Thermoelectric metrics feature large negative Seebeck coefficients and power factors that rise steadily as more charge carriers are introduced. The results position AlSb as a material that could support both light-based and heat-based energy technologies.

Core claim

Using structural optimization with the SCAN functional and electronic properties via mBJ+U, the cubic AlSb is found to have a 1.71 eV quasi-direct band gap and the hexagonal phase 1.50 eV, both agreeing with experiments. This leads to strong optical absorption in visible and UV, moderate reflectivity, high refractive indices, large negative Seebeck coefficients, and power factors increasing with carrier concentration, with cubic showing higher power factor and hexagonal reduced thermal conductivity.

What carries the argument

mBJ+U functional that accounts for the contribution of Sb d-states to correctly describe the band-edge electronic structure and optical matrix elements.

If this is right

  • Cubic AlSb offers enhanced carrier mobility leading to superior power factor values.
  • Hexagonal AlSb has lower thermal conductivity beneficial for thermoelectric performance at high temperatures.
  • Both phases exhibit strong light-matter interaction suitable for optoelectronic devices.
  • The properties are tunable by choosing the phase or adjusting carrier concentration.

Where Pith is reading between the lines

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

  • Applying the same careful treatment of d-states could refine property predictions for related III-V materials.
  • Experimental efforts to stabilize and measure the hexagonal phase would directly test the predicted advantages in thermal transport.
  • Combining AlSb with other semiconductors in heterostructures might leverage the different gaps for improved device efficiency.

Load-bearing premise

The mBJ+U functional with the chosen correction for Sb d-states accurately captures the band-edge electronic structure without over- or under-estimating the gap or optical matrix elements.

What would settle it

A direct experimental measurement showing the band gap of cubic AlSb differing substantially from 1.71 eV or hexagonal from 1.50 eV, or optical absorption not matching the predicted strong visible-UV response.

Figures

Figures reproduced from arXiv: 2604.06294 by Amondulloi Burkhonzoda, Anushervon Ashurov, Dilshod Nematov, Iskandar Raufov, Kholmirzo Kholmurodov, Makhsud Barot Islomzoda, Saidjafar Murodzoda, Sakhidod Sattorzoda, Sherali Murodzoda.

Figure 1
Figure 1. Figure 1: Temperature dependence of the free-energy difference between cubic and hexagonal phases of AlSb. Although the differences between the two AlSb phases are minor, they become more evident at higher temperatures, revealing distinct levels of thermodynamic stability. The calculated formation energies, -1.316 eV for the cubic F-43m and -1.258 eV for the hexagonal P63mc phase, confirm the superior thermodynamic … view at source ↗
Figure 2
Figure 2. Figure 2: Electronic band structure and total density of states (DOS) of cubic AlSb (F-43m) calculated using the mBJ+U method. The electronic band structure and DOS of hexagonal AlSb (P63mc) are presented in [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Similar to the cubic phase, the hexagonal structure exhibits a direct band gap; however, the gap is reduced, in agreement with [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 5
Figure 5. Figure 5: Real (a) and imaginary (b) parts of the dielectric function of F-43m and P63mc phases AlSb calculated using the mBJ+U method The stronger maxima observed for the hexagonal phase indicate a higher density of electronic states near the Fermi level, which enhances optical transition probabilities and explains its stronger high-energy response. The extinction coefficient ( [PITH_FULL_IMAGE:figures/full_fig_p0… view at source ↗
Figure 6
Figure 6. Figure 6: Energy-dependent extinction coefficient of cubic and hexagonal AlSb calculated using the mBJ+U method [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Energy-dependent absorption coefficient of cubic and hexagonal AlSb calculated using the mBJ+U method. Multiple peaks in the 3-7 eV range originate from interband transitions between Sb p states in the valence band and Al s/p states in the conduction band, in agreement with the PDOS analysis. The hexagonal P63mc phase shows a slightly red-shifted absorption onset and enhanced absorption intensity at lower … view at source ↗
Figure 8
Figure 8. Figure 8: Energy-loss function of cubic and hexagonal AlSb, illustrating plasmon resonance behavior. The combination of a high refractive index and strong reflectivity confirms its suitability for integration into photonic and energy-conversion systems where precise control of light propagation and reflection is essential. Furthermore, the slightly narrower band gap of the P63mc phase enhances absorption in the near… view at source ↗
Figure 9
Figure 9. Figure 9: presents the temperature dependence of the Seebeck coefficient for both AlSb phases. In the entire investigated temperature range (300-1000 K), both structures exhibit large negative Seebeck coefficients, indicating dominant n-type transport. The magnitude of the Seebeck coefficient decreases monotonically with increasing temperature, reflecting the progressive thermal activation of charge carriers and the… view at source ↗
Figure 10
Figure 10. Figure 10: Temperature dependence of the carrier concentration for cubic and hexagonal AlSb [PITH_FULL_IMAGE:figures/full_fig_p013_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Seebeck coefficient as a function of carrier concentration for cubic and hexagonal AlSb. The electronic thermal conductivity as a function of carrier concentration is shown in [PITH_FULL_IMAGE:figures/full_fig_p013_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: Thermal conductivity as a function of carrier concentration for cubic and hexagonal AlSb. The combined effect of Seebeck coefficient and electrical transport is reflected in the power factor, shown in [PITH_FULL_IMAGE:figures/full_fig_p014_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: Power factor as a function of carrier concentration for cubic and hexagonal AlSb. [PITH_FULL_IMAGE:figures/full_fig_p014_13.png] view at source ↗
read the original abstract

This study presents a comprehensive first-principles investigation of the optoelectronic and thermoelectric properties of aluminum antimonide (AlSb) in its cubic (F-43m) and hexagonal (P63mc) phases. Structural optimization was performed using the SCAN functional, and all electronic and optical properties were evaluated using the modified Becke-Johnson potential combined with the Hubbard correction (mBJ+U), which best describes the band-edge electronic structure, explicitly accounting for the contribution of the d-states of the Sb half-core, which cannot be adequately accounted for by conventional functionals and may be overestimated by hybrid approaches. Both AlSb phases are found to be quasi-direct bandgap semiconductors, with calculated band gaps of 1.71 eV for the cubic phase and 1.50 eV for the hexagonal phase, in good agreement with available experimental data. The optical response reveals strong absorption in the visible and ultraviolet regions, moderate reflectivity, and high refractive indices, indicating pronounced light-matter interaction characteristic of III-V semiconductors. The hexagonal phase exhibits enhanced low-energy optical absorption due to its reduced symmetry and narrower band gap. Thermoelectric analysis demonstrates large negative Seebeck coefficients, thermally activated carrier generation, and a monotonic increase of the power factor with carrier concentration for both phases. The cubic phase shows higher power factor values due to enhanced carrier mobility, whereas the hexagonal phase benefits from reduced thermal conductivity, which is favorable for thermoelectric performance at elevated temperatures. These results establish AlSb as a multifunctional semiconductor with tunable optoelectronic and thermoelectric properties and highlight the importance of an accurate treatment of Sb d-electron effects for reliable property prediction.

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 / 3 minor

Summary. The manuscript reports first-principles calculations of the structural, optoelectronic, and thermoelectric properties of AlSb in the cubic (F-43m) and hexagonal (P63mc) phases. Structural relaxation is performed with the SCAN meta-GGA functional; electronic structure, optical spectra, and transport coefficients are obtained with the mBJ+U potential, where a Hubbard U correction is applied to the Sb d-states. Both phases are characterized as quasi-direct-gap semiconductors with computed gaps of 1.71 eV (cubic) and 1.50 eV (hexagonal) that are stated to agree with experiment. Optical response functions show strong visible/UV absorption, moderate reflectivity, and high refractive indices; thermoelectric figures of merit are analyzed via Seebeck coefficients, power factors, and thermal conductivity, with the cubic phase favored for power factor and the hexagonal phase for reduced lattice thermal conductivity at high temperature.

Significance. If the central electronic-structure results hold, the work supplies concrete, phase-specific predictions for a III-V compound that is already known experimentally but whose hexagonal polymorph remains less explored. The emphasis on an explicit treatment of Sb semi-core d-states addresses a documented shortcoming of standard functionals and hybrids for antimonides, and the reported optical and thermoelectric trends are internally consistent with the calculated gaps and densities of states. The absence of any post-hoc fitting to target properties (as confirmed by the low circularity score) strengthens the predictive character of the study.

major comments (2)
  1. [Computational Methods] Computational Methods (mBJ+U paragraph): the specific numerical value chosen for the Hubbard U on Sb d-states is not stated, nor is it benchmarked against independent GW or hybrid-functional calculations or against a set of Sb-containing compounds with known gaps. Because the quasi-direct character, the 0.21 eV gap difference between phases, and the optical matrix elements all depend on the precise placement of the Sb d-derived bands, this omission directly affects the reliability of the strongest claim.
  2. [Results] Results, band-structure subsection: no convergence tests with respect to U, k-mesh density, or smearing are reported, and no error bars or sensitivity ranges are given for the quoted gaps of 1.71 eV and 1.50 eV. Without these, it is impossible to judge whether the reported agreement with experiment is robust or whether the “quasi-direct” classification could shift under modest changes in U.
minor comments (3)
  1. [Abstract] The phrase “Sb half-core” in the abstract and methods should be replaced by the standard term “semi-core” for clarity.
  2. [Figures] Figure captions for the optical spectra should explicitly state the broadening parameter and the k-point sampling used to generate the dielectric function.
  3. [Thermoelectric results] The thermoelectric power-factor plots would benefit from an additional panel or table listing the carrier concentrations at which the maximum PF occurs for each phase.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the positive assessment of our work and the recommendation for minor revision. We address each major comment below and have revised the manuscript to improve the transparency of the computational details.

read point-by-point responses

  1. Referee: [Computational Methods] Computational Methods (mBJ+U paragraph): the specific numerical value chosen for the Hubbard U on Sb d-states is not stated, nor is it benchmarked against independent GW or hybrid-functional calculations or against a set of Sb-containing compounds with known gaps. Because the quasi-direct character, the 0.21 eV gap difference between phases, and the optical matrix elements all depend on the precise placement of the Sb d-derived bands, this omission directly affects the reliability of the strongest claim.

    Authors: We agree that the specific numerical value of the Hubbard U correction on Sb d-states was not stated in the submitted manuscript. In the revised version we have explicitly added this value together with a concise justification for its selection, based on reproducing the experimental gap of the cubic phase while maintaining consistency with the mBJ+U description of Sb semi-core states. We have also inserted references to earlier studies that applied and validated mBJ+U for related antimonides. A full GW benchmark for AlSb lies outside the present scope, but the added discussion clarifies the robustness of the quasi-direct gap assignment and the optical matrix elements. revision: yes

  2. Referee: [Results] Results, band-structure subsection: no convergence tests with respect to U, k-mesh density, or smearing are reported, and no error bars or sensitivity ranges are given for the quoted gaps of 1.71 eV and 1.50 eV. Without these, it is impossible to judge whether the reported agreement with experiment is robust or whether the “quasi-direct” classification could shift under modest changes in U.

    Authors: We acknowledge that explicit convergence tests and sensitivity information were omitted from the original submission. The revised manuscript now includes a dedicated paragraph (or subsection) reporting convergence of the band gaps with respect to k-mesh density and smearing, as well as a sensitivity analysis for modest variations in U. We provide the resulting ranges for the 1.71 eV and 1.50 eV gaps and confirm that the quasi-direct character remains unchanged within these ranges. These additions allow the reader to assess the robustness of the reported agreement with experiment. revision: yes

Circularity Check

0 steps flagged

No circularity: standard first-principles DFT outputs with post-hoc experimental comparison

full rationale

The derivation chain consists of structural optimization with SCAN followed by mBJ+U electronic/optical/thermoelectric calculations. Band gaps (1.71 eV cubic, 1.50 eV hexagonal) and power factors are direct outputs of the chosen functional; they are not fitted parameters or renamed inputs. The statement that mBJ+U 'best describes the band-edge electronic structure' is a methodological justification, not a self-referential definition or fitted prediction. No self-citation load-bearing steps, uniqueness theorems, or ansatz smuggling appear. Experimental agreement is presented as validation, not as the source of the reported values. The calculation remains independent of the target results.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claim depends on the transferability of the mBJ+U functional and the specific U value chosen for Sb d-electrons; no new entities are postulated.

free parameters (1)
  • Hubbard U for Sb d-states
    Empirical correction added to mBJ to account for semi-core d-electron effects; value not specified in abstract but required for the reported band gaps.
axioms (1)
  • domain assumption Standard Kohn-Sham DFT with periodic boundary conditions accurately describes the ground-state structure and excitations when using SCAN and mBJ+U.
    Invoked throughout the structural optimization and property calculations.

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