Characterization of InP electron-initiated impact ionization in low electric fields using abrupt junction NpN InP/GaAsSb/InP double heterojunction bipolar transistors
Bibliographic record
Abstract
The electron impact ionization coefficient αn(E) in InP is determined from electron multiplication measurements in NpN InP/GaAsSb/InP double heterojunction bipolar transistors (DHBTs). The staggered (“type-II”) band lineup between the p+ GaAs0.51Sb0.49 base and the InP collector layer allows the injection of a pure electron initiating current directly into the InP collector across an abrupt base/collector heterojunction, without the ambiguities associated with the compositional grading otherwise required to overcome the blocking band discontinuity between Ga0.47In0.53As and InP. InP/GaAsSb/InP DHBTs thus enable us to characterize αn(E) in InP in a low-field regime. Whereas the αn(E) values we extract at higher fields are in good agreement with previously reported photodiode based measurements, our data reveal a clear low-field “tail” for αn(E)<102 cm−1, indicating that InP has a soft impact ionization threshold similar to that observed for electrons in Ga0.47In0.53As. This finding can be understood in terms of the similarities between the conduction band structures of InP and Ga0.47In0.53As.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| 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".