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Phys Rev Lett. 2003 Nov 14;91(20):205502. Epub 2003 Nov 10.

Evidence of the Zn vacancy acting as the dominant acceptor in n-type ZnO.

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  • 1Laboratory of Physics, Helsinki University of Technology, P.O. Box 1100, 02015 HUT, Finland.


We have used positron annihilation spectroscopy to determine the nature and the concentrations of the open volume defects in as-grown and electron irradiated (E(el)=2 MeV, fluence 6 x 10(17) cm(-2)) ZnO samples. The Zn vacancies are identified at concentrations of [V(Zn)] approximately 2 x 10(15) cm(-3) in the as-grown material and [V(Zn)] approximately 2 x 10(16) cm(-3) in the irradiated ZnO. These concentrations are in very good agreement with the total acceptor density determined by temperature dependent Hall experiments. Thus, the Zn vacancies are dominant acceptors in both as-grown and irradiated ZnO.

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