High performance InP/GaAsSb/InP DHBTs with heavily doped base layers
Bibliographic record
Abstract
We discuss the design and fabrication of high-performance InP/GaAsSb/InP NpN double heterostructure bipolar transistors (DHBTs) grown by MOCVD with heavy carbon doping in the GaAsSb base layer. The staggered (type II) band lineup at InP-GaAsSb heterojunctions allows the growth of abrupt E/B and C/B heterojunctions, thus greatly simplifying the growth and implementation of DHBTs. In addition, C-doped GaAsSb base layers are essentially free of H-passivation effects and can be doped to levels as high as 2.5/spl times/10/sup 20/ cm/sup -3/ while maintaining hole mobilities of at least /spl mu//sub p/=25-30 cm/sup 2//Vs for extremely low base sheet resistances. We show that cutoff frequencies in excess of 200 GHz can be achieved while maintaining breakdown voltages /spl ges/6 V thanks to the low impact ionization coefficients in the InP collector. InP/GaAsSb/InP DHBTs therefore show much potential for /spl ges/40 Gb/s applications.
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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) | 0.013 | 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".