Publications [#222972] of Henry Everitt

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Papers Published
  1. Teke, A and {\"O}zg{\"u}r, {\"U}mit and Do{\u g}an, S and Gu, X and Morko{\c c}, H and Nemeth, B and Nause, J and Everitt, Henry O, Excitonic fine structure and recombination dynamics in single-crystalline ZnO, Physical Review B (Condensed Matter and Materials Physics), vol. 70 no. 19 (November, 2004), pp. 195207 [nph-data_query], [doi] .

    Abstract:
    The optical properties of a high quality bulk 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 3.3605eV having a linewidth of 0.7meV and dominating the PL spectrum at 10K . This bound exciton transition was visible only below 150K , whereas the A-free exciton transition at 3.3771eV persisted up to room temperature. A-free exciton binding energy of 60meV is obtained from the position of the excited states of the free excitons. Additional intrinsic and extrinsic fine structures such as polariton, two-electron satellites, donor-acceptor pair transitions, and longitudinal optical-phonon replicas have also been observed and investigated in detail. Time-resolved PL measurements at room temperature reveal a biexponential decay behavior with typical decay constants of ˜170 and ˜864ps for the as-grown sample. Thermal treatment is observed to increase the carrier lifetimes when performed in a forming gas environment.