Two-Dimensional 2H-TaS<sub>2</sub> Contact for Fermi-Level Pinning-Free P-Type WSe<sub>2</sub> Field-Effect Transistors
Bibliographic record
Abstract
Two-dimensional (2D) transition metal dichalcogenides (TMDs), represented by WSe 2, have exhibited considerable promise in complementary metal-oxide-semiconductor and optoelectronic device applications due to their tunable bandgap and the prospect of compatibility with conventional silicon-based processes. However, the precise control of p-type transport characteristics in 2D TMDs has been challenging due to the Fermi-level pinning effect at the interface with evaporated metal electrodes, resulting in most TMDs exhibiting a single n-type conductivity and significantly impeding the achievement of p-type and n-type contacts by using homogeneous materials. Here, we present Fermi-level pinning-free WSe 2 field-effect transistors via 2D van der Waals 2H-TaS 2 contacts, establishing an exceptionally clean and atomically flat interface between the WSe 2 semiconductor and the 2H-TaS 2 metal. Such contacts enable the Schottky barrier height to closely match the work function of the 2H-TaS 2 electrodes, as evidenced by a pinning factor of 0.95, conforming to the Schottky–Mott rule. The integration of TaS2 as contacts in WSe 2 field-effect transistors results in p-type polarity, predominantly driven by hole transport, without the need for external doping, demonstrating a hole mobility of 23.74 cm 2 V –1 s –1 and an on/off current ratio of 1 × 10 7 . Our findings further reveal that the p-type polarity achieved through this interface engineering strategy exhibits robustness, regardless of the thickness of WSe 2, thereby offering a promising application opportunity for next-generation logic electronics utilizing 2D materials.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".