Ultra-near-surface gallium-activated 435 nm luminescence from donor-acceptor-pair recombination in ion-beam implanted 4H-SiC
Why this work is in the frame
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Bibliographic record
Abstract
Nitrogen and gallium-doped SiC and its luminescence properties are investigated in detail. Spatially highly localized gallium doping is realized by ion implanting Ga into n-type 4H SiC using an ion milling tool for the first time. A nanoscale depth region of Ga-rich SiC is formed near the SiC surface, followed by 1600 °C activation annealing. An AlN capping layer is used to avoid the out-diffusion of Ga, stabilize the SiC surface, and serve as an additional source of N dopant. An emission spectrum with a peak wavelength of approximately 435 nm at room temperature is identified and confirmed to be due to Ga-N donor-acceptor-pair recombination. Photoluminescence, cathodoluminescence, SEM and TEM results are presented. It is thereby shown that the more conventional p-type dopant Al can be replaced by Ga, enabling high-intensity Taylor cone gallium ion sources to achieve highly spatially controlled donor-acceptor pair emission from SiC. Several aspects of the relevance of spatially localized donor-acceptor pair emission are described.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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) | 0.000 | 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