Unraveling Surface Scattering Mechanisms in Hydrogen-Terminated Diamond/MoO<sub>3</sub> Heterostructures: A Theoretical Investigation
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Bibliographic record
Abstract
Surface transfer doping addresses diamond’s doping challenges by enabling a two-dimensional hole gas (2DHG) in hydrogen-terminated diamond (H-diamond) through electron transfer to high-electron-affinity acceptors, such as molybdenum trioxide (MoO 3 ). While prior studies optimized 2DHG density, the mechanisms limiting carrier mobility remain unresolved. Here, we present a theoretical framework to quantify the impact of acoustic phonon, surface roughness, and surface impurity scattering on hole mobility in H-diamond/MoO 3 heterostructure (∼10 13 cm –2 ). First-principles calculations demonstrate that surface roughness dominates mobility degradation, reducing it from 10 3 to 10 2 cm 2 /(V s) compared to phonon-only cases, while surface impurities further suppress mobility (MoO 3 and HCO 3 yield the highest and lowest mobilities of ∼220 and 166 cm 2 /(V s), respectively). Total calculated hole mobility (∼200 cm 2 /(V s)) aligns with experimental ranges, with roughness heights (Δ = 0.18–0.35 nm) and impurity densities ( n imp 2 D = 4.32 × 10 13 cm − 2 ) identified as critical factors. These findings establish that mitigating interfacial surface roughness and suppressing adsorbates are essential for optimizing diamond-based devices, providing actionable strategies to enhance high-power diamond electronic performance.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it