<P>Variable-wavelength photodetectors are fabricated by a selective growth of Zn<SUB><I>x</I></SUB>Cd<SUB>1−<I>x</I></SUB>Se alloy nanowires on patterned Au catalysts thus forming nanowire ai...
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https://www.riss.kr/link?id=A107584564
2010
-
SCI,SCIE,SCOPUS
학술저널
2386-2390(5쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P>Variable-wavelength photodetectors are fabricated by a selective growth of Zn<SUB><I>x</I></SUB>Cd<SUB>1−<I>x</I></SUB>Se alloy nanowires on patterned Au catalysts thus forming nanowire ai...
<P>Variable-wavelength photodetectors are fabricated by a selective growth of Zn<SUB><I>x</I></SUB>Cd<SUB>1−<I>x</I></SUB>Se 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, Zn<SUB><I>x</I></SUB>Cd<SUB>1−<I>x</I></SUB>Se 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 < <I>x</I> < 0.72. The spectral responses of Zn<SUB><I>x</I></SUB>Cd<SUB>1−<I>x</I></SUB>Se 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 Zn<SUB>0.72</SUB>Cd<SUB>0.28</SUB>Se ones, which is explained by adsorption and photodesorption of O<SUB>2</SUB> on the surface of CdSe nanowires.</P> <P>Graphic Abstract</P><P>Wavelength-controlled photodetectors are fabricated by selectively growing Zn<SUB><I>x</I></SUB>Cd<SUB>1−<I>x</I></SUB>Se alloyed nanowires on patterned Pt pillar electrodes, in which nanowire/nanowire junctions act as the conducting path. The fabricated photodetectors display excellent color-variable photoresponses from red to blue.
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