Open AccessLithium related deep and shallow acceptors in Li-doped ZnO nanocrystals
Author(s) -
Christian Rauch,
W. Gehlhoff,
Markus R. Wagner,
E. Malguth,
Gordon Callsen,
Ronny Kirste,
B. Salameh,
A. Hoffmann,
Sebastian Polarz,
Y. Aksu,
Matthias Drieß
Publication year - 2010
Publication title -
journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.699
H-Index - 319
eISSN - 1089-7550
pISSN - 0021-8979
DOI - 10.1063/1.3275889
Subject(s) - acceptor , photoluminescence , electron paramagnetic resonance , doping , materials science , shallow donor , luminescence , nanocrystal , valence (chemistry) , electron acceptor , spectroscopy , photochemistry , chemistry , condensed matter physics , nanotechnology , nuclear magnetic resonance , optoelectronics , physics , organic chemistry , quantum mechanics
We study the existence of Li-related shallow and deep acceptor levels in Li-doped ZnO nanocrystals using electron paramagnetic resonance (EPR) and photoluminescence (PL) spectroscopy. ZnO nanocrystals with adjustable Li concentrations between 0% and 12% have been prepared using organometallic precursors and show a significant lowering of the Fermi energy upon doping. The deep Li acceptor with an acceptor energy of 800 meV could be identified in both EPR and PL measurements and is responsible for the yellow luminescence at 2.2 eV. Additionally, a shallow acceptor state at 150 meV above the valence band maximum is made responsible for the observed donor-acceptor pair and free electron-acceptor transitions at 3.235 and 3.301 eV, possibly stemming from the formation of Li-related defect complexes acting as acceptors.
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