Abstract
By combining results from positron annihilation and photoluminescence spectroscopy with data from Hall effect measurements, the characteristic deep level emission centered at ∼1.75 eV and exhibiting an activation energy of thermal quenching of 11.5 meV is associated with the zinc vacancy. Further, a strong indication that oxygen interstitials act as a dominating acceptor is derived from the analysis of charge carrier losses induced by electron irradiation with variable energy below and above the threshold for Zn-atom displacement. We also demonstrate that the commonly observed green emission is related to an extrinsic acceptorlike impurity, which may be readily passivated by oxygen vacancies.
| Original language | English |
|---|---|
| Article number | 121203 |
| Pages (from-to) | 1-5 |
| Number of pages | 5 |
| Journal | Physical Review B |
| Volume | 86 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Sept 2012 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- photoluminescence
- positron
- vacancies
- ZnO
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