Details
| Original language | English |
|---|---|
| Article number | 024311 |
| Journal | Journal of applied physics |
| Volume | 107 |
| Issue number | 2 |
| Early online date | 27 Jan 2010 |
| Publication status | Published - 2010 |
| Externally published | Yes |
Abstract
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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Journal of applied physics, Vol. 107, No. 2, 024311, 2010.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Lithium related deep and shallow acceptors in Li-doped ZnO nanocrystals
AU - Rauch, C.
AU - Gehlhoff, W.
AU - Wagner, M. R.
AU - Malguth, E.
AU - Callsen, G.
AU - Kirste, R.
AU - Salameh, B.
AU - Hoffmann, A.
AU - Polarz, S.
AU - Aksu, Y.
AU - Driess, M.
N1 - Funding Information: We thank the Grillo-group and Grillo Zinkoxid GmbH for financial support. The Deutsche Forschungsgemeinschaft (DFG) is acknowledged for funding (SFB 787; Project Nos. PO780/4-1 and DR 226/16-1). A. Orlov is acknowledged for assistance in the synthesis of the Li-containing ZnO materials. M.R.W. and C.R. acknowledge an Ernst-von-Siemens scholarship and a Marie Curie ITN fellowship, respectively. B.S. acknowledges an Erasmus Mundus External Cooperation scholarship and support by the DFG (Project No. GE 709/11-1).
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=75749142315&partnerID=8YFLogxK
U2 - 10.1063/1.3275889
DO - 10.1063/1.3275889
M3 - Article
AN - SCOPUS:75749142315
VL - 107
JO - Journal of applied physics
JF - Journal of applied physics
SN - 0021-8979
IS - 2
M1 - 024311
ER -