Positron-Annihilation, Structural and Optical Studies on Properties of Nanostructured ZrO2, ZnO, Bi2O3 and ZnO-Bi2O3 |
| J.D. Fidelusa, A. Karbowskib, J. Grabisc, A. Juszad, R. Piramidowiczd, R.S. Brusae and G.P. Karwaszb
aInstitute of High Pressure Physics, Polish Academy of Sciences, Warsaw, Poland bInstitute of Physics, Nicolaus Copernicus University, ToruĊ, Poland cInstitute of Inorganic Chemistry, Riga Technical University, Salaspils, Latvia dInstitute of Microelectronics and Optoelectronics, Warsaw University of Technology, Warsaw, Poland eDipartimento di Fisica, Universita di Trento, Trento, Italy |
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| Nanostructured oxides, like ZrO2, on ZnO and Bi2O3 show interesting electronic and photovoltaic properties. Pressed and annealed samples were obtained from nanopowders grown in hydrothermal or plasma processes. Positron annihilation (the Doppler broadening depth-resolved, positron lifetime) techniques were used to trace structural changes in samples after annealing. Photoluminescence spectra of all investigated samples show broad-band emission in the visible, with intensity depending on annealing temperature. The change in nanoporosity and positron lifetimes correlate well with changes in photoluminescence properties. The nature of broad photoluminescence bands is to be understood; Further positron studies via the Doppler coincidence method would help in identifying the nature of defects in these samples. |
| DOI: 10.12693/APhysPolA.120.A-66 PACS numbers: 71.60.+z, 78.70.Bj, 71.55.Cn |