Understanding the Impact of Contact-Induced Strain on the Electrical Performance of Monolayer WS<sub>2</sub> Transistors
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide Two-dimensional (2D) electronics require low contact resistance ( R C ) to approach their fundamental limits. WS 2 is a promising 2D semiconductor that is often paired with Ni contacts, but their operation is not well understood considering the nonideal alignment between the Ni work function and the WS 2 conduction band. Here, we investigate the effects of contact size on nanoscale monolayer WS 2 transistors and uncover that Ni contacts impart stress, which affects the WS 2 device performance. The strain applied to the WS 2 depends on contact size, where long (1 μm) contacts ( R C ≈ 1.7 kΩ·μm) show a 78% reduction in R C compared to shorter (0.1 μm) contacts ( R C ≈ 7.8 kΩ·μm). We also find that thermal annealing can relax the WS 2 strain in long-contact devices, increasing R C to 8.5 kΩ·μm. These results reveal that thermo-mechanical phenomena can significantly influence 2D semiconductor–metal contacts, presenting opportunities to optimize device performance through nanofabrication and thermal budget.
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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".