Comparison of single and double barrier pseudomorphic doped-channel GaInP/GaInAs/GaAs HFET's: performance and isolation properties
Bibliographic record
Abstract
Doped-channel GaInP/GaInAs/GaAs pseudomorphic heterostructure field-effect transistors (HFETs) were fabricated both with and without a GaInP barrier layer under the GaInAs channel. Two sets of alloy compositions were investigated: Ga/sub 0.85/In/sub 0.15/As channels with Ga/sub 0.51/In/sub 0.49/P barriers, and Ga/sub 0.70/In/sub 0.30/As channels with Ga/sub 0.62/In/sub 0.38/P barriers. For each composition, 1.1 /spl mu/m gate length devices with single and double barrier structures showed similar maximum drain currents (I/sub dmas/), and peak transconductances (g/sub m/), while the double barrier devices showed reduced output conductances (g/sub ds/) compared to the single barrier devices, resulting in a 30-50% larger voltage gain. RF measurements showed a higher maximum frequency of oscillation (f/sub max/) for the double barrier devices of both compositions. For mesa etch isolation of the double barrier devices, it was found to be necessary to remove the bottom GaInP barrier layer to achieve satisfactory device isolation. We speculate that a parasitic 2-dimensional electron gas may be formed at the interface between the bottom GaInP barrier and the GaAs buffer layer.
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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) | 0.000 | 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".