3D Digital Holography Investigations of Giant Photostriction Effect in MAPbBr<sub>3</sub> Perovskite Single Crystals
Bibliographic record
Abstract
Abstract The photoinduced physics always is a critical but controversial question for the new optoelectronic materials of halide perovskites. A high‐quality MAPbBr3 single crystal is grown and the lattice expansion induced by variable power X‐ray irradiation is investigated.A photoinduced deformation measurement system utilizing the off‐axis holography technique is developed and constructed to measure and illuminate the global photo‐induced deformation of MAPbBr3. Under a 473 nm laser with a power of 50 mW, MAPbBr3 exhibits an average maximum relative deformation of 1.27 × 10−3, demonstrating its remarkable photosensitivity and robust geometric response capabilities. Digital holography reveals photostriction as a localized phenomenon, reflecting the localization effect of the photogenerated carriers. The energetic and spatial transitions of those photogenerated carriers weaken the interatomic forces and in turn straighten the Pb─Br─Pb frameworks, expanding the lattice. This geometric change and the corresponding electronic impact are verified by Raman spectra, photoluminescence measurements, and first‐principle calculations. The methods and results are significant for future research on light‐induced phenomena in perovskites and other solid materials.
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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) | 0.002 | 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".