Selective deactivation of perovskite grain boundaries
Why this work is in the frame
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Bibliographic record
Abstract
Grain boundaries in perovskites are a major source of degradation in perovskite solar cells. Here, we report selective passivation of perovskite grain boundaries with the aid of biphenyl-containing moieties. We find that biphenyl ligands selectively react with PbI2-rich interfaces but not with perovskite itself. Such targeted defect deactivation of grain boundaries leads to extended radiative recombination lifetime from 1 to 2.7 μs while allowing for efficient charge transfer from grains. The hydrophobic nature of benzene ring present in biphenyl improves the stability of perovskite in direct reaction with water by a factor of 3. The devices, all fabricated in ambient air, show significantly improved reproducibility (17%–21% efficiency) and increased open-circuit voltage of 1.11 V. This work offers a design principle for selective passivation of grain boundaries and chemical stabilization of hybrid structures.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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 it