CdZnTe surface conditioning using Ar plasma
Bibliographic record
Abstract
CdZnTe semiconductor direct conversion X-ray detectors are highly sought-after for applications in medical imaging and security due to their potential to deliver a high SNR at room temperature. However, the growth and subsequent processing of wafers induce a defective layer at the surface yielding a large density of trapping center thus reducing the charge collection and SNR. Whereas this layer is typically removed using a Br: MeOH wet etching, we investigate the use of Ar plasma for better repeatability and uniformity. The 400 W Ar plasma treatment is shown to increase the surface roughness to 10.9 nm (RMS) from 3.7 nm (RMS) for the chemical-mechanical-polished surface. Albeit this notable roughness, the etched contacts are shown to present a dark current of 2.5 nA, an increase of 1.5 nA from those on the chemical-mechanical-polish surface. The devices fabricated are still shown to present a dark current an order of magnitude lower than devices prepared by 5% Br:MeOH. This decrease in dark current is attributed to the maintenance of the surface stoichiometry, yet the increase in the surface roughness likely causes an increase in the surface state density. The plasma process is further found to remove the charge-trapping effects found in polished devices.
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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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".