Physics – Condensed Matter – Materials Science
Scientific paper
2005-10-13
Phys. Stat. Sol. (c) 3(4) (2006) p. 956
Physics
Condensed Matter
Materials Science
5 pages, 1 figure, conference on II-VI compounds, RevTeX
Scientific paper
10.1002/pssc.200564636
Transparent and conductive ZnO:Ga thin films are prepared by laser molecular-beam epitaxy. Their electron properties were investigated by the temperature-dependent Hall-effect technique. The 300-K carrier concentration and mobility were about $n_s \sim 10^{16}$ cm$^{-3}$ and 440 cm$^{2}$/Vs, respectively. In the experimental `mobility vs concentration' curve, unusual phenomenon was observed, i.e., mobilities at $n_s \sim 5\times$ 10$^{18}$ cm$^{-3}$ are significantly smaller than those at higher densities above $\sim 10^{20}$ cm$^{-3}$. Several types of scattering centers including ionized donors and oxygen traps are considered to account for the observed dependence of the Hall mobility on carrier concentration. The scattering mechanism is explained in terms of inter-grain potential barriers and charged impurities. A comparison between theoretical results and experimental data is made.
Kawasaki Masahiro
Makino Takaki
Ohtomo Akira
Segawa Yusaburo
Tsukazaki Atsushi
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