Au ∕ Ag and Au∕Pd molecular contacts to GaAs
Bibliographic record
Abstract
The hot electron transport through Au∕Pd or Au∕Ag/molecular layer/n-GaAs diodes has been studied by using ballistic electron emission microscopy (BEEM). The monolayers consisted of either octanedithiol (HS–(CH2)8–SH) or hexadecanethiol (HS–(CH2)15–CH3) linear alkane chains and were deposited from ethanol solutions onto molecular beam epitaxially grown GaAs (001) surfaces. The metals were electron-beam evaporated onto the molecular layer. Similar to previous results for Au diodes, Au∕Pd metallization onto an octanedithiol monolayer resulted in a large reduction in the BEEM signal, compared to Au and Au∕Pd reference diodes (without monolayers). However, unlike Au/octanedithiol diodes, the BEEM signal was stronger and the threshold was found to be 1.2eV instead of 1.4eV. We attribute this to ballistic electron transmission rather than to the photonic signal that we previously reported for Au/octanedithiol. In comparison, the Au∕Pd/hexadecanethiol diodes showed little change from the reference Au∕Pd diodes, suggesting monolayer disruption by interdiffusion of Pd or Au through the molecules to the interface. Ag∕GaAs or Au∕Ag∕GaAs diodes, with or without a molecular layer, did not result in reliable tunneling, likely the result of a tip-induced reaction. The octanedithiol layer on GaAs provides a free thiol group for bonding with the top metal contact, minimizing Au or Pd penetration and the displacement of the molecule-GaAs thiol bond but not completely eliminating these effects in the case of Pd.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 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".