Time-Resolved Mapping of Charge Carrier Dynamics and Defect-Mediated Migration Barriers in TiO<sub>2</sub>
Bibliographic record
Abstract
The spatiotemporal behavior of charge carriers in metal oxides governs their performance in photocatalytic and electronic applications, yet remains poorly understood at the nanoscale. Here, we use time-resolved atomic force microscopy (TR-AFM) to map charge transport in TiO 2 under controlled surface irradiation and thermal conditions. Our measurements reveal pronounced spatial variability in carrier migration times and activation energies, driven by local defect landscapes. Irradiation-induced surface defects are found to lower migration barriers, enhancing carrier relaxation. Notably, we observe electrostatic memory effects, with residual electric fields modulating migration dynamics across hundreds of nanometers. Temperature-dependent studies further reveal a tunable interaction between defect-mediated migration and thermal activation. These findings provide direct insight into nanoscale charge transport in TiO 2 and highlight the role of defect engineering and thermal management in optimizing oxide-based devices for energy conversion and sensing.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".