Intrinsic Modulation Doping Enhances the Thermoelectric Performance of Monolayer GaGeTe
Bibliographic record
Abstract
Modulation doping is a well-known approach for improving the efficiency of bulk thermoelectrics, yet its application to 2D materials has remained elusive. Our thorough first-principles calculations reveal a unique intrinsic modulation doping in monolayer GaGeTe that synergistically raises its electrical transport coefficients while dwarfing its lattice heat transport, resulting in a high thermoelectric figure of merit, zT . Herein, we envision 2D GaGeTe as a chair-like germanene monolayer shrouded by two GaTe layers. The germanene layer donates electrons to the outer GaTe, creating a spatial separation between the electron-donation center and charge transport channels, a feature that suppresses free carrier scattering. Our accurate electron–phonon calculations explain that electrical transport in GaGeTe results from the metallic nature of germanene combined with the Mexican-hat shape of the GaTe valence band. The superior electrical and poor heat transport coefficients turn GaGeTe into a promising p-type thermoelectric monolayer working at moderate carrier concentrations of ≈10 13 cm –2 . The presented results put forward a distinct design approach for identifying competent thermoelectrics among 2D materials whose frail structures cannot tolerate heavy doping.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".