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 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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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".