Regensburg 2007 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 46: Poster 2
HL 46.40: Poster
Thursday, March 29, 2007, 15:00–17:30, Poster A
Unambiguous identification of the PL-I9-line in zinc oxide — Sven Müller1, Daniel Stichtenoth1, Michael Uhrmacher1, Hans Hofsäss1, Jens Röder2, Anjeschka Kulinska3, and •Carsten Ronning1 — 1II. Physikalisches Institut, Georg-August Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 2Institut für Physikalische und Theoretische Chemie, TU Braunschweig, Hans-Sommer-Str.10, D-38106 Braunschweig, Germany — 3H. Niewodniczanski Institute of Nuclear Physics, Polish Academie of Science, Radzikowskiego 152, 31-342 Krakow, Poland
The intense luminescence of zinc oxide (ZnO) is usually dominated by transitions of donor bound excitons. The identity of the respective causing donors is in the most cases unknown, but a clear identification can be achieved using radioactive dopants, which undergo an element transition upon decay. Thus, luminescence lines, which vary their intensities with the specific half-life of the respective isotope with increasing measuring time, can be unambiguous assigned to specific elements. We have implanted radioactive 111In with an ion energy of 400 keV into ZnO single crystals. The isotope 111In decays into stable 111Cd with an half-time of 2,8 days; thus, an element transition from a donor to an isoelectronic element within the ZnO crystal occurs upon time. The annealing process (in air,700∘C) was monitored by perturbed angular-γγ-spectroscopy (PAC). The samples were characterised by photoluminescence spectroscopy over a time period of 3 weeks. The obtained results together with additional ion implantation studies with stable 115In and varying ion fluences will be discussed.