Space charge layer dynamics at oxide-semiconductor interfaces under optical modulation: Theory and experimental studies by non-contact photocarrier radiometry
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Bibliographic record
Abstract
The dynamic theory of the optically modulated space charge layer (SCL) resulting from band-bending at a Si - SiO 2 interface was developed in terms of the density of interface charges occupying bandgap energy states. Expressions were derived for these interface charge densities, interacting with the free carrier-density-wave generated in the SCL and in the quasi-neutral region (hulk) by an intensity-modulated super-bandgap laser. The PCR theory incorporating these effects was further developed. It was found to involve the dc, fundamental, and entire harmonic spectrum of the excitation frequency as a result of the optical modulation of the curvature of the energy bands and the SCL width at the interface. PCR was used experimentally with a harmonically modulated low-power laser pump and a superposed dc super-bandgap optical bias (a secondary laser beam) to control and monitor the space-charge-layer width in oxidized p-Si - SiO 2 and n-Si - SiO 2 interfaces (wafers) exhibiting charged interface-state related band-bending. The application of the theory to the experiments yielded the various transport parameters of the samples as well as depth profiles of the SCL exhibiting complete (p-type Si) or partial (n-type Si) band-flattening, to a degree controlled by the widely different minority carrier capture cross-section at each interface. The uncompensated charge density at the interface was also calculated from the theory.
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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 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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