ZnO and Mg_xZn_(1-x)O nanocrystals grown by non-hydrolytic route

摘要

ZnO and Mg_xZn_(1-x)O nanocrystals with Mg concentration of 2—30 at% were grown with non-hydrolytic route employing metal cupferronate complex as precursors. ZnO nanocrystals are spherical and their sizes are independent of Zn precursor concentration, but incorporation of Mg results in Mg_xZn_(1-x)O nanocrystal morphology and size dependence on Mg precursor concentration. Mg_xZn_(1-x)O exciton emission is dominant when Mg concentration is less than 10 at%. With a further increase in Mg concentration, deep trap emission becomes dominant. Mg_xZn_(1-x)O nanocrystal band gap enlarges obviously with an increase in Mg concentration from 2 to 15 at%. With a further increase in Mg concentration, Mg_xZn_(1-x)O band gap enlarges slowly. Mg_xZn_(1-x)O band gap can be tuned from 3.30 to 3.84eV with an increase in Mg concentration from 2 to 30 at%.