Potential and challenges of intermediate band and hot carrier solar cells
Bibliographic record
Abstract
I will discuss the status of intermediate band (IB) solar cells and of a recently proposed hot carrier solar cell concept called valley photovoltaics (VPV). I will discuss the development of a trio of models, with varying computational cost, for understanding and designing advanced concept photovoltaics. I will describe Simudo, a Poisson/drift-diffusion solver for advanced PV, and use it to validate a semi-analytic model for IB devices, which allows rapid exploration of the design space. Including realistic nonradiative losses, efficient IBSCs will be easier to make with higher bandgap materials than are most commonly studied, and I will show experiments and design concepts for GaN-based IB devices. The VPV concept is that hot carriers can be maintained in and extracted from metastable valleys of the conduction band. Devices so far have JV curves with a strong S-shape and low power generation. We adapt Simudo to treat VPV and well reproduce experimental JV curves. I will discuss the various origins of the S-shape. I will introduce an equivalent circuit model for the S-shape and connect it to physics in the device, giving insight into the obstacles to achieving high efficiency.
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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 | 0.000 | 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) | 0.000 | 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".