Abstract
Electric fields in near-surface space charge regions influence the spatial distribution of charged defects, with implications for the efficiency of photocatalysts and gas sensors. Through isotopic oxygen diffusion experiments on both Zn-terminated ZnO (0001) and O-terminated ZnO (0001¯), the present work better delineates the quantitative relationship of defect pile-up to the degree and direction of near-surface band bending, the rate of defect injection, and the temperature. The two terminations exhibit dramatic differences in behavior from each other, especially in the temperature dependence. The results suggest that the amount of fixed charge at the surface directly affects the injected flux.
Original language | English (US) |
---|---|
Pages (from-to) | 95-98 |
Number of pages | 4 |
Journal | Solid State Ionics |
Volume | 301 |
DOIs | |
State | Published - Mar 1 2017 |
Keywords
- Defect diffusion
- Polar surface
- Space charge
- ZnO
ASJC Scopus subject areas
- General Chemistry
- General Materials Science
- Condensed Matter Physics