Optimization of Electrical contacts for Solution Grown Single Crystal CsPbBr<sub>3</sub> Radiation Detectors
Bibliographic record
Abstract
CsPbBr<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> radiation detectors are a potential low-cost alternative to the leading room-temperature detector material, Cadmium Zinc Telluride (CZT). However, the leading method for growing CsPbBr<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> uses expensive starting materials that do not offer major cost reductions compared to other detector materials. This work focuses on optimizing the electrical contacts for CsPbBr<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> detectors grown from cheaper starting materials of lower purity. In order to grow high purity crystals from lower purity starting material, a modified growth method was used to segregate impurities during growth. The unique growing condition for these crystals necessitates tailored optimization of electrical contacts in order to handle their charge carrier transport behaviour. Asymmetrical devices with a high work function metal contact (Au) and a lower work function metal contact (In) were fabricated in order to have low leakage current under a specific polarity. Pure In contacts have not been extensively studied compared to other metals. The In contacts were not stable when left directly exposed to air, so these contacts were covered with a semitransparent layer of Au (40 nm). Devices made with this configuration were able to resolve the energy spectrum of alpha particles a <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">241</sup>Am source. We have yet to resolve gamma radiation with our solution grown detectors, though the Au/In/CsPbBr<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf>/Au configuration has been able to resolve the gamma spectrum of a <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">137</sup>Cs source using a detector grown from the more typical pure binaries method. This aim of this work and future work is to continue to reduce the differences in detector performance between our growth method and the standard method.
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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".