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Investigation of zinc vacancies and their influence on N and Li related defect complexes in hydrothermal ZnO

Knutsen, Knut Erik
Master thesis
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Knutsen.pdf (1.523Mb)
Year
2009
Permanent link
http://urn.nb.no/URN:NBN:no-21995

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  • Fysisk institutt [2514]
Abstract
Hydrothermal ZnO samples having lithium concentration in the range

of $3 \times 10^{14}$ -- $1 \times 10^{17}$\,Li/cm$^{3}$ were

implanted with nitrogen. The variation of Li concentration was done

by high temperature pre-anneals and controlled by secondary-ion mass

spectrometry (SIMS). The efficiency of zinc vacancy clustering after

ion implantation and post-implantation anneals was monitored by

positron annihilation spectroscopy (PAS). It was found that the

presence of Li enhances clustering of zinc vacancies considerably.

In addition the resistivity evolution was monitored by scanning

spreading resistance microscopy, and in combination with PAS, the

results indicate the presence of a Li--N related doubly negative

complex emerging at 800\,$^\circ$C. SIMS has also revealed the

presence of additional processing induced defects acting as a Li

traps with much lower diffusivity than un-trapped Li.
 
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