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Structural and optoelectronic properties of glucose capped Al and Cu doped ZnO nanostructures Cover

Structural and optoelectronic properties of glucose capped Al and Cu doped ZnO nanostructures

Materials Science-Poland
Volume 34 (2016): Issue 1 (March 2016)
By: Gunjan Patwari,  Pradip Kumar Kalita and  Ranjit Singha  
Open Access
|Apr 2016

Figures & Tables

Fig. 1

XRD spectra of undoped and doped ZnO.
XRD spectra of undoped and doped ZnO.

Fig. 2

XRD spectra of doped and co-doped ZnO.
XRD spectra of doped and co-doped ZnO.

Fig. 3

HRTEM images of as-prepared samples: (a), (b), (c), (d), (e) and (f).
HRTEM images of as-prepared samples: (a), (b), (c), (d), (e) and (f).

Fig. 4

UV-Vis absorption spectra of synthesized nano samples: (a) ZnO, (b) ZnO:Al, (c) ZnO:Cu and (d) ZnO:( Al,Cu).
UV-Vis absorption spectra of synthesized nano samples: (a) ZnO, (b) ZnO:Al, (c) ZnO:Cu and (d) ZnO:( Al,Cu).

Fig. 5

Tauc plot of (αhν)2 vs. photon energy (eV) of ZnO:Al,Cu; ZnO:Cu; ZnO:Al and pure ZnO.
Tauc plot of (αhν)2 vs. photon energy (eV) of ZnO:Al,Cu; ZnO:Cu; ZnO:Al and pure ZnO.

Fig. 6

PL spectra of synthesized nano-samples of (A) ZnO, (B) ZnO:Al, (C) ZnO:Cu and (D) ZnO:(Al,Cu).
PL spectra of synthesized nano-samples of (A) ZnO, (B) ZnO:Al, (C) ZnO:Cu and (D) ZnO:(Al,Cu).

Fig. 9

I-V characteristics of ZnO nanostructures.
I-V characteristics of ZnO nanostructures.

Fig. 7

Deconvoluted photoluminescence peaks of undoped and doped ZnO.
Deconvoluted photoluminescence peaks of undoped and doped ZnO.

Fig. 8

Schematic energy level diagram of ZnO nanoparticles showing emission mechanism.
Schematic energy level diagram of ZnO nanoparticles showing emission mechanism.

PL peak positions and energy levels in the samples_

PeakZnOZnO:AlZnO:CuZnO:Al,Cu
Nos.λ [nm]Energy [eV]λ [nm]Energy [eV]λ [nm]Energy [eV]λ [nm]Energy [eV]
I3563.493553.503553.503573.48
II3953.153993.123963.143993.12
III4222.954682.664672.664392.83
IV6022.075992.086132.036002.07

Change of d values corresponding to lattice planes_

Standard d value [nm]Observed d value of ZnOObserved d value of ZnO:AlObserved d value of ZnO:CuObserved d value of ZnO(Al,Cu)(h k l)
0.282040.280470.287600.2736970.270137100
0.260620.260730.259190.2655340.265534002
0.248060.241160.232200.2533980.251864101
0.191410.198380.197450.1837490.188419102
0.162840.165540.166200.1558730.162570110
0.147930.149190.143160.1444540.152229103
0.138100.134710.132340.1375290.134283112

Particle sizes and energy band gaps of ZnO quantum dots_

SampleParticle size from XRD [nm]Particle size from HRTEM [nm]Energy band gap [eV]Blue shift [eV]Particle size from EMA [nm]
ZnO6.255.33.70.335.18
ZnO:Al5.674.13.80.434.52
ZnO:Cu9.395.03.780.414.62
ZnO:Al,Cu7.464.24.130.763.39
DOI: https://doi.org/10.1515/msp-2016-0030 | Journal eISSN: 2083-134X | Journal ISSN: 2083-1331
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Language: English
Page range: 69 - 78
Submitted on: Apr 25, 2015
Accepted on: Jan 8, 2016
Published on: Apr 27, 2016
Published by: Wroclaw University of Science and Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
d-value,
doping,
defects,
band gap,
Burstein-Moss effect,
conductivity
Related subjects:
Materials sciences,
Materials sciences, other,
Nanomaterials,
Functional and smart materials,
Materials characterization and properties

© 2016 Gunjan Patwari, Pradip Kumar Kalita, Ranjit Singha, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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