Variational Reconstruction of Exciton Multipath Deexcitation Lifetime Spectra in Coupled PbS Colloidal Quantum Dots
Bibliographic record
Abstract
In typical quantum dot solids used for photovoltaic applications, the dominant source of carrier loss is through trap states. Identifying pathways for exciton relaxation from these states is important to the optimization of energy conversion devices. A generalized variational inverse method for the reconstruction of multipath exciton lifetime spectra in PbS colloidal quantum dots (CQD) used for solar cells was developed which allows for resolving concurrent multipath relaxation lifetime mechanisms in the form of Voigt distributions. The variational inverse method was applied to high signal-to-noise ratio photocarrier radiometric phase frequency responses from coupled CQD assemblies with 0.5–1.0 nm interdot spacings. Two concurrent deexcitation mechanisms with radiative and nonradiative channels were found in the range of 300 K ≥ T ≥ 100 K: Exciton–phonon interaction involving the lowest 1S–1S excitonic state splitting and a thermalization broadening model based on the exciton trapping probability dominated the temperature range of ≥200 K. Exciton hopping in the form of tunneling from a smaller quantum dot in a higher-energy state to a lower-energy state of nearby larger quantum dots dominated temperatures <200 K.
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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) | 0.000 | 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) | 0.000 | 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".