Tuning the Optoelectronic Properties of Pulsed Laser Deposited “3D”‐MoS<sub>2</sub> Films via the Degree of Vertical Alignment of Their Constituting Layers
Bibliographic record
Abstract
Abstract Pulsed‐laser‐deposition (PLD) is used to deposit MoS 2 thin films at substrate temperatures ( T d ) ranging from 25 to 700 °C. A T d = 500 °C is identified as the optimal temperature that yields MoS 2 films consisting of highly‐crystallized 2H‐MoS 2 phase with a strong (002) preferential orientation, a direct optical bandgap ( E g ) of ∼1.4 eV and a strong photoresponse of ∼1500%. Raman spectroscopy revealed that the degree of vertical alignment of MoS 2 layers in the films also reaches its maximum at T d = 500 °C. High‐resolution‐transmission‐electron‐microscopy has provided a clear‐cut evidence that the PLD‐MoS 2 films predominantly consist of vertically aligned MoS 2 layers over all the film thickness of ∼90 nm, enabling those “3D” films to behave as a direct‐bandgap “2D‐MoS 2 ” with exceptional optoelectronic properties. Indeed, at T d = 500 °C, the PLD‐MoS 2 based photodetectors (PDs) devices are shown to exhibit the highest responsivity ( R ) and detectivity ( D *) values (125 mA W −1 and 9.2 × 10 9 Jones, respectively) ever reported for large area (≥ 1 cm 2 ) MoS 2 ‐based PDs operating at a voltage as low as 1 V. For the first time, a constant‐plus‐linear relationship between E g , R , and D * of the PDs and the degree of vertical alignment of the MoS 2 layers is established. Such a correlation is fundamental for the controlled growth of PLD‐MoS 2 films and the tuning of their properties in view of their integration with standard large‐scale‐integration processing.
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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 | 0.000 | 0.000 |
| Open science | 0.000 | 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".