Enhanced photocurrent gain and spectrum range based on the composite consisting of SnO{sub 2} nanowires and CdSe quantum dots

Journal Article · Mon Aug 22 04:00:00 EDT 2011 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3626588· OSTI ID:22027721

Lu, M L; Lin, C H; Chen, Y F ^[1]

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1. Department of Physics, National Taiwan University, Taipei 10617, Taiwan (China)

High sensitivity with additional spectral response based on the composite consisting of SnO{sub 2} nanowires (NWs) and CdSe quantum dots (QDs) has been demonstrated. The underlying mechanism is attributed to the spatial separation of photogenerated electrons and holes due to the charge transfer arising from type II band alignment between CdSe QD and SnO{sub 2} NW. This work shows that by selective decoration of suitable QDs, the photocurrent gain of NWs not only can be greatly enhanced, but also can be extended to a wider range photoresponse spectrum. Our result, therefore, provides a very useful guideline to create high efficiency photodetectors.

• OSTI ID: 22027721
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 8 Vol. 99; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
CADMIUM SELENIDES
CHARGE EXCHANGE
COMPOSITE MATERIALS
EFFICIENCY
ELECTRONS
EMISSION SPECTRA
GAIN
HOLES
PHOTOCONDUCTIVITY
PHOTODETECTORS
PHOTOEMISSION
QUANTUM DOTS
QUANTUM WIRES
SEMICONDUCTOR MATERIALS
SENSITIVITY
SPECTRAL RESPONSE
TIN OXIDES