Performance comparison of Cu and Ni gates for deep submicrometer AlGaN/GaN HFETs
Bibliographic record
Abstract
Abstract Copper (Cu) was investigated as the gate contact metallization in AlGaN/GaN heterostructure field‐effect transistors (HFETs). For comparison, Nickel/Gold (Ni/Au) gate devices were fabricated on the same sample using electron beam lithography. Both metallization schemes yielded comparable transconductance characteristics: the maximum extrinsic transconductance reached 290 mS/mm. At gate voltage of ‐20 V, the reverse current for the Cu Schottky contact was roughly one to two orders of magnitude lower than that of Ni/Au contact. For Cu/Au gate devices, the product of current gain cut‐off frequency ( f T ) and gate length L G improved by 15% compared to Ni/Au gate devices. The power gain cut‐off frequency ( f max ) also improved by at least 15%. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.003 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| 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)
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".