Abstract
Hydrogen shallow donors in sol–gel-prepared pristine and Al-doped ZnO systems have been investigated by electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) measurements. It is shown that the hydrogen shallow donors in the Al-doped ZnO system mostly occupy the interstitial sites as in the case of the pristine ZnO system. Our high-resolution NMR measurements sensitively reflected the slightly distinct lattice environments in the pristine and Al-doped ZnO systems.
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