The Preparation and Optical Properties of Zn1-xMgxO and Zn1-xMnxO Thin Films by Sol-gel Process
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The Preparation and Optical Properties of Zn1-xMgxO and Zn1-xMnxO Thin Films by Sol-gel Process
Chinese Journal of LuminescenceVol. 30, Issue 5, Pages: 624-629(2009)
作者机构:
西北大学 信息科学与技术学院,陕西 西安,710127
作者简介:
基金信息:
DOI:
CLC:O482.31
Received:17 July 2008,
Revised:02 January 1900,
Published Online:30 October 2009,
Published:30 October 2009
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LU Ting, ZHANG Zhi-yong, YAN Jun-feng, et al. The Preparation and Optical Properties of Zn1-xMgxO and Zn1-xMnxO Thin Films by Sol-gel Process[J]. Chinese journal of luminescence, 2009, 30(5): 624-629.
DOI:
LU Ting, ZHANG Zhi-yong, YAN Jun-feng, et al. The Preparation and Optical Properties of Zn1-xMgxO and Zn1-xMnxO Thin Films by Sol-gel Process[J]. Chinese journal of luminescence, 2009, 30(5): 624-629.DOI:
The Preparation and Optical Properties of Zn1-xMgxO and Zn1-xMnxO Thin Films by Sol-gel Process
Zinc oxide (ZnO) semiconductor with a large exciton binding energy of 60 meV and a direct-band gap of 3.37 eV has attracted tremendous attention in recent years because of its high potential for applications
such as short wavelength optical devices
photonic devices and laser systems etc. Especially
the optical pro-perties of ZnO can be obviously influenced by impurity doping with different concentrations
so several techniques
such as pulsed laser deposition
reactive thermal evaporation and sol-gel process
have been employed to synthesize high quality ZnO and doped-ZnO thin films. In this work
based on the fact that metal-doped concentrations have great influence on the crystal structure and ultraviolet(UV) emission of ZnO
such as Mg-doped and Mn-doped ZnO thin films
a consistent set of epitaxial n-type conducting Zn
1-x
Mg
<
em
>
xO and Zn
1-x
Mn
<
em
>
xO thin films were grown by sol-gel process on Si(110) substrates
and their crystal structures and radiation qualities influenced by different doping concentrations were studied. Meanwhile
the results of XRD
atomic force microscope(AFM) and photoluminescence(PL) spectrum indicated that the crystal structure
surface morphology and UV emission are sensitive to the doping concentrations. Compared with ZnO
Zn
1-x
-Mg
<
em
>
xO and Zn
1-x
Mn
<
em
>
xO thin films tends to growth in c-axis-orientation
and a strong blue-shift UV emission peak at 365 nm appears both in Zn
1-x
Mg
<
em
>
xO and Zn
1-x
Mn
<
em
>
xO. In particular
the visible emission of ZnO
which is typically due to the existence of surface defects and oxygen vacancies(V″
O
) defects appears between 430 and 490 nm in the PL spectra. It is passivated in Zn
1-x
Mn
<
em
>
xO films at room temperature
which leads to that the UV emission qualities of Zn
1-x
Mn
<
em
>
xO thin films being greater as 56 times as the visible emissions in the optimal doping concentration. At the same time
the causes of blue-shift and Zn
1-x
Mn
<
em
>
xOs visible emissions passivation was studied
through the experiments it was indicated that Zn
1-x
Mn
<
em
>
xOs blue-shift UV emissions could be primarily caused by the Burstein-Moss(BM) effect
and the visible emissions passivation could be caused by the reduction of V″
O
defects induced by the Mn oxide. At last
the optimal doping concentrations of Zn
0.85
Mg
0.15
O and Zn
0.97
Mn
0.03
O were demonstrated
which displays the strong blue-shift UV emissions and the best UV emission qualities.
关键词
Keywords
references
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