Characterization of GaAs1−xNx epitaxial layers by ion beam analysis
Bibliographic record
Abstract
GaAs 1−x N x epitaxial layers grown on (001) GaAs substrates by metal organic vapor phase epitaxy, with x ranging from 0.01 to 0.036, were characterized by ion beam analysis. The layers thickness and quality were measured by Rutherford backscattering spectrometry (RBS) in channeling mode. The channeling results confirm that GaAs1−xNx epitaxial layers are of high crystalline quality, in agreement with high resolution x-ray diffraction and transmission electron microscopy analyses. For the sample with x=0.036, the results reveal a 0.7 at. % of misplaced (or highly locally strained) Ga or As atoms. More than 80% of nitrogen atoms in this layer occupy substitutional sites, as determined by the N14(α,p)17O nuclear reaction analysis (NRA). Furthermore, RBS analyses using a 5 MeV O3+ probe beam reveal measurable departures from III–V stoichiometry near the surface, which remains unexplained. Finally, the total content of nitrogen in the layers measured both by NRA and elastic recoil detection by time-of-flight are compared with the results obtained by secondary ion mass spectrometry.
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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 | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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 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".