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Coaxial Ag/ZnO/Ag nanowire for highly sensitive hot-electron photodetection.
- Source :
-
Applied Physics Letters . 2/23/2015, Vol. 106 Issue 9, p1-5. 5p. 1 Diagram, 3 Graphs. - Publication Year :
- 2015
-
Abstract
- Single-nanowire photodetectors (SNPDs) are mostly propelled by p-n junctions, where the detection wavelength is constrained by the band-gap width. Here, we present a simple doping-free metal/semiconductor/metal SNPD, which shows strong detection tunability without such a material constraint. The proposed hot-electron SNPD exhibits superior optical and electrical advantages, i.e., optically the coaxial design leads to a strong asymmetrical photoabsorption and results in a high unidirectional photocurrent, as desired by the hot-electron collection; electrically the hot-electrons are generated in the region very close to the barrier, facilitating the electrical transport. Rigorous calculations predict an unbiased photoresponsivity of ~200 nA/mW. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SILVER compounds
*NANOWIRES
*PHOTODETECTORS
*BAND gaps
*WAVELENGTHS
*CHARGE transfer
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 106
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 101401959
- Full Text :
- https://doi.org/10.1063/1.4913613