Transition from Photoconductivity to Photovoltaic Effect in P3HT/CuInSe<sub>2</sub> Composites
Bibliographic record
Abstract
We report the investigation of composites of poly-(3-hexylthiophene) (P3HT) and CuInSe 2 nanocrystals (NCs). CuInSe 2 NCs were synthesized at gram scale through a colloidal route. Cyclic voltammetry was used to determine the HOMO–LUMO energy levels, as well as the energies of trap states intrinsic to CuInSe 2 NCs. The results suggest that nanocrystal–polymer charge transfer is foreseeable in the P3HT and CuInSe 2 system because of their type II band alignment. We studied optical properties of the hybrid composite films of P3HT and CuInSe 2 NCs as a function of P3HT/CuInSe 2 NCs weight ratios. The quenching of photoluminescence spectra with the increase of CuInSe 2 ratio in the composite was interpreted to result from charge transfer between the polymer and CuInSe 2 NCs. We further studied photodiode devices that exhibited a transition from photoconductive gain to the photovoltaic effect with an increase of the P3HT/CuInSe 2 weight ratio. Performance of the photovoltaic devices was strongly limited by intrinsic traps associated with the CuInSe 2 NCs.
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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".