The optical response of silicon thin-films grown by ultra-high-vacuum evaporation
Bibliographic record
Abstract
Conventional forms of silicon thin-film, prepared through the use of a plasma, offer a variety of attractive electronic properties but are prone to an instability. Hydrogen atoms are believed to be the source of the instability. Accordingly, experimental collaborators at the National Research Council of Canada employed ultra-high-vacuum evaporation to prepare thin-films of silicon on optical quality fused quartz substrates, which allow for a great deal of atomic species control during the growth process. The optical properties associated with these ultra-high-vacuum prepared forms of silicon thin-film are examined. In particular, through experimental measurements of the specular reflectance spectrum at near-normal incidence and the regular transmittance spectrum at normal incidence, the spectral dependence of the optical functions is resolved for eleven silicon thin- films, deposited at different growth temperatures. Generally, the refractive index increases in response to increases in the growth temperature. The optical absorption spectral dependence is also observed to exhibit a fundamental transition in its behavior with increases in the growth temperature. These observations are related to the changes that occur in the crystalline volume fraction accompanying increases in the growth temperature. A detailed quantitative uncertainty analysis is also performed. Drawing upon X-ray diffraction results, a placement of these silicon thin-films into the overall silicon thin-film continuum is then performed. Raman spectral results are then correlated with the refractive index's spectral dependence. The Raman spectrum of a given silicon thin-film allows for a probe of the order, correlating the Raman results with the optical function results providing one with the opportunity to probe how disorder influences the optical functions. All measures of order suggest that the order increases in response to increases in the growth temperature. Finally, the device implications of these results are explored, with a focus on photovoltaic device applications. It is concluded that this particular form of silicon thin- fil is a promising material for use as the absorbing media within solar cells, offering an enhancement in the absorption which is greater than that offered by conventional plasma prepared silicon thin-films.
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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 | 0.000 | 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 | 0.001 | 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 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".