Speaker
Prof.
Martin Henry
(School of Physical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland)
Description
We report the results of photoluminescence studies of zinc oxide implanted with radioactive 117Ag which decays through Cd and In on to stable Sn. Our results show that two of the so-called I-lines, I9 and I2, both decay away in accordance with the decay of radioactive 117In. This confirms an earlier result that I9 is due to excitons bound to In donors and shows conclusively for the first time that the I2 line is also due to In. We do not observe any photoluminescence due to either Cd or Sn both opf which exist at sizeable concentrations during or after the 117Ag decay sequence. It appears that, in contrast to Hg, isoelectronic Cd does not bind an exciton in ZnO, and that Sn, in contrast to another group IV impurity Ge, does not produce a sharp bound exciton line well below the band gap.
Primary author
Mr
Joseph Cullen
(School of Physical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland)
Co-authors
Mr
Karl Johnston
(ISOLDE/CERN, PH Div, CERN, Geneva 23, CH-1211, Switzerland)
Prof.
Martin Henry
(School of Physical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland)
