Physics – Condensed Matter – Materials Science
Scientific paper
2004-06-09
Appl. Phys. Lett. vol. 85(5) p. 759 (2004)
Physics
Condensed Matter
Materials Science
accepted for publication for Applied Physics Letters 4 figures
Scientific paper
10.1063/1.1776630
We investigated the optical properties of epitaxial \textit{n}-type ZnO films grown on lattice-matched ScAlMgO$_4$ substrates. As the Ga doping concentration increased up to $6 \times 10^{20}$ cm$^{-3}$, the absorption edge showed a systematic blueshift, consistent with the Burstein-Moss effect. A bright near-bandedge photoluminescence (PL) could be observed even at room temperature, the intensity of which increased monotonically as the doping concentration was increased except for the highest doping level. It indicates that nonradiative transitions dominate at a low doping density. Both a Stokes shift and broadening in the PL band are monotonically increasing functions of donor concentration, which was explained in terms of potential fluctuations caused by the random distribution of donor impurities.
Kawasaki Masahiro
Makino Takaki
Ohtomo Akira
Segawa Yusaburo
Tsukazaki Atsushi
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