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

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Synthesis of ZnxCd1-xSe (0 <= x <= 1) alloyed nanowires for variable-wavelength photodetectors

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Title
Synthesis of ZnxCd1-xSe (0 <= x <= 1) alloyed nanowires for variable-wavelength photodetectors
Author
Yoon, Yeo-JunePark, Kyung-SooHeo, Jeong-HoonPark, Jae-GwanNahm, SahnChoi, Kyoung Jin
Keywords
Air-bridges; AU catalysts; Band gap energy; Cutoff wavelengths; High conductivity; Lattice parameters; Photo-desorption; Selective growth; Spectral response; Structural transitions; Switching operations; Visible spectra; Wurtzites; Zinc blende
Issue Date
2010
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY, v.20, no.12, pp.2386 - 2390
Abstract
Variable-wavelength photodetectors are fabricated by a selective growth of ZnxCd1-xSe alloy nanowires on patterned Au catalysts thus forming nanowire air-bridges between two Pt pillar electrodes. From the composition-dependent linear changes of bandgap energies and lattice parameters, ZnxCd1-xSe nanowires are found to be perfectly alloyed in the entire range of Zn composition without any phase separation and have a structural transition from zinc blende to wurtzite at 0.31 < x < 0.72. The spectral responses of ZnxCd1-xSe detectors show that the cut-off wavelength can be continuously tuned within the visible spectrum of light extending from red to blue. In on-off switching operations, all of the detectors can be reversibly switched between the low and the high conductivity state but the CdSe detector has slower response and recovery behaviors than ZnSe and Zn0.72Cd0.28Se ones, which is explained by adsorption and photodesorption of O-2 on the surface of CdSe nanowires.
URI
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DOI
10.1039/b917531h
ISSN
0959-9428
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MSE_Journal Papers
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