Excitonic fine structure and recombination dynamics in single-crystalline ZnO

The optical properties of a high quality bulk $\mathrm{ZnO}$, thermally post treated in a forming gas environment are investigated by temperature dependent continuous wave and time-resolved photoluminescence (PL) measurements. Several bound and free exciton transitions along with their first excited states have been observed at low temperatures, with the main neutral-donor-bound exciton peak at $3.3605\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ having a linewidth of $0.7\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ and dominating the PL spectrum at $10\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. This bound exciton transition was visible only below $150\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, whereas the A-free exciton…

• OO
  Office of Naval Research