Band gap dependence upon thickness of chalcogenide Ge-As-S thin films
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Bibliographic record
Abstract
We have studied thin films of Ge<sub>25</sub>As<sub>30</sub>S<sub>45</sub> glass evaporated by electron-beam technique. We have analyzed the transmission spectra of thin films of the same nominal composition, obtained under identical conditions, but with four different thicknesses varying from 1 to 7 micrometers. All fabricated films were annealed for 1h at 300<sup>o</sup>C (below the glass transition temperature of this glass). As a result, we observed a thickness dependent blue-shift of about 100 nm of their transmission edge. We have calculated the optical band gap of those annealed thin films and we have observed that the slope of absorption edge becomes less abrupt and the band gap decreases when their thickness increases. Furthermore, this band gap decrease is accompanied with a broadening of the tails and localized states, which indicates an increase of the degree of disorder in the vitreous network. This could be explained by the higher density of defects and dangling bonds in the thinner films since the amount of deposited material is smaller. This implies therefore an increase of both the degree of disorder and the concentration of defects, and consequently the decrease of the optical gap.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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)
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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