Issue 12, 2010

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

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 O2 on the surface of CdSe nanowires.

Graphical abstract: Synthesis of ZnxCd1−xSe (0 ≤ x ≤ 1) alloyed nanowires for variable-wavelength photodetectors

Article information

Article type
Paper
Submitted
25 Aug 2009
Accepted
22 Dec 2009
First published
08 Feb 2010

J. Mater. Chem., 2010,20, 2386-2390

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

Y. Yoon, K. Park, J. Heo, J. Park, S. Nahm and K. J. Choi, J. Mater. Chem., 2010, 20, 2386 DOI: 10.1039/B917531H

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