Tuning the Optoelectronic Properties of Pulsed Laser Deposited “3D”‐MoS<sub>2</sub> Films via the Degree of Vertical Alignment of Their Constituting Layers
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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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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| 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 it