Comparison of CuPc-based organic thin-film transistors made by different dielectric structures
Bibliographic record
Abstract
Copper phthalocyanine-based organic thin-film transistors (OTFTs) with gate dielectric made by different combinations of ZrO2 and Al2O3 are fabricated. Experimental results show that as compared to the OTFTs with ZrO2/Al2O3 stacked and Al2O3/ZrO2/Al2O3 sandwiched gate dielectric, the device fabricated with the Al2O3/ZrO2 stacked gate dielectric manifests better electrical properties such as larger on/off ratio, smaller subthreshold slope, and higher carrier mobility. This could be explained by the fact that Al2O3 has good interface properties with CuPc and can act as a barrier layer, which prevents intermixing of materials at the organic/insulator interface and can slow oxygen diffusion through Al-O matrix, thus suppressing interfacial trap density. The gate-bias stress effect on the performance of OTFTs is also investigated. It is found that the threshold voltage shifts toward positive direction with stress time under a negative gate bias voltage. Longer stress times cause more degradation of the subthreshold and on/off ratio, probably due to more defect-state creation in the channel and an increase of interfacial traps and oxide charges in the dielectric during stress. Results also indicate that OTFTs with Al2O3 interlayer between the high-k dielectric and the gate electrode have less degradation in subthreshold and on/off ratio after a 3600-s stress. The involved mechanism lies in that the Al2O3 interlayer at the high-k dielectric/gate electrode interface can effectively block the injection of electrons from the gate electrode into the high-k material during electrical stress and thus less stress-induced interfacial traps and negative oxide charges in the devices. The electrical characteristics of the OTFTs after the removal of gate bias for a period of time are also studied.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| 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 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".