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Choi, Kyoung Jin
Energy Conversion Materials (EcoMAT) Lab
Research Interests
  • Solar cells, thermoelectrics, piezoelectric

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Synthesis and Optical Properties in ZnS(x)Se(1-x) Alloy Nanowires

Cited 3 times inthomson ciCited 3 times inthomson ci
Title
Synthesis and Optical Properties in ZnS(x)Se(1-x) Alloy Nanowires
Author
Choi, Young-JinKwon, S. JoonChoi, Kyoung JinKim, Dong-WanPark, Jae-GwanNahm, Sahn
Keywords
Nanowire; Photoluminescence; PLD; Zns; ZnSe
Issue Date
2009-04
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.54, no.4, pp.1650 - 1654
Abstract
We studied pseudobinary ZnS(x)Se(1-x) (0 <= x <= 1) alloy nanowires synthesized on an Au-coated Si substrate by using a pulsed laser deposition (PLD) process. The synthesized nanowires had diameters ranging from 50 to 200 nm and a length of about 100 mu m. The X-ray-diffraction analysis revealed that the nanowires had a hexagonal wurtzite crystal structure. The diffraction peaks were shifted toward a higher 2 theta value with increasing x value and both the lattice constant and the unit cell volume were linearly correlated with the composition, satisfying Vegard's law. By measuring the photoluminescence of the nanowires, we found that the direct bandgap of the nanowires also changed linearly with the composition, indicating that the direct bandgap of the nanowires could be modulated in the spectral region over a range of 2.66 - 350 eV. This linear scaling behavior of the bandgap was distinguished from the case of thin films made of the same materials, mainly due to the inner strain relaxation in the confined one-dimensional structure of the nanowires as was the case for the CdS(x)Se(1-x) nanowires. In this spectral region, ZnS(x)Se(1-x) nanowires can be applied to optoelectronic devices such as photo-sensors to cover a broad band of electromagnetic radiation from visible light to UV excitation.
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DOI
10.3938/jkps.54.1650
ISSN
0374-4884
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MSE_Journal Papers
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