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

Yeo June Yoon, Kyung Soo Park, Jeong Hoon Heo, Jae Gwan Park, Sahn Nahm, Kyoung Jin Choi

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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.

Original languageEnglish
Pages (from-to)2386-2390
Number of pages5
JournalJournal of Materials Chemistry
Volume20
Issue number12
DOIs
Publication statusPublished - 2010 Mar 19

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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