Dopant layer abruptness in strained Si1−xGex heterostructures
Bibliographic record
Abstract
Low-temperature photoluminescence (PL) has been used to evaluate dopant concentration and vertical location in heterostructures consisting of strained Si0.85Ge0.15 layers on Si (001). The boron dopant profile was established to be abrupt within 1 nm on samples grown by reduced pressure chemical vapor deposition. The structure had a 20 nm thick Si0.85Ge0.15 layer which was either uniformly doped or had a 10 nm thick dopant in the adjoining Si. The PL variation with dopant displacement was described using simple geometric considerations for exciton penetration from the SiGe into the adjacent Si. Screening by dopant atoms in the sheet caused exciton quenching which depended on dopant displacement and concentration. The best fit between the calculated and observed dependence was obtained for an exciton radius of 6 nm. For small dopant displacement with high boron concentration, dopant diffusion was observed from the Si to the SiGe.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), 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".