Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 117, Issue -, Pages 363-371Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2013.06.032
Keywords
Zinc oxide; Photoluminescence; Ytterbium; Down-shifting; Photon conversion
Ask authors/readers for more resources
Doping wide band gap semiconductors, such as ZnO, with trivalent rare earth (RE) ions is well known to enhance their optical activity. The present paper shows that high quality ZnO:Yb layers can be obtained by RF magnetron sputtering and that an efficient electronic transfer from ZnO to Yb+3 ions can be achieved. It is also shown that the rare earth is optically active at any deposition temperature and that its contribution to the photoluminescence (PL) is important even at very low concentrations. In particular, for samples deposited at low temperatures, the rare earth strongly enhances the photon conversion, yielding a total PL up to three times more intense. On the other hand, if the layers are exposed to temperatures above 200 degrees C, either during deposition or upon post-deposition annealing, the presence of Yb quenches the total PL. Thermal annealing of the films at 700 degrees C under Ar or O-2 gas flow highly improves the PL of both ZnO and ZnO:Yb. (C) 2013 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available