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Enhancement of the sub-band-gap photoconductivity in ZnO nanowires through surface functionalization with carbon nanodots
- Source :
- Dipòsit Digital de la UB, Universidad de Barcelona, Recercat. Dipósit de la Recerca de Catalunya, instname
- Publication Year :
- 2018
- Publisher :
- American Chemical Society, 2018.
-
Abstract
- We report on the surface functionalization of ZnO nanowire (NW) arrays by attachment of carbon nanodots (C-dots) stabilized by polyethylenimine. The photoconductive properties of the ZnO NWs/C-dots devices were investigated under photoexcitation with photon energies below and above the ZnO band gap. The results indicate an increased photoresponse of the functionalized devices in the visible spectral range, as well as enhanced UV photoconductivity. This is attributed to the fast injection of photoexcited electrons from the C-dots into the conduction band of the ZnO NWs, and the subsequent slower desorption of molecular species from the NW surface, which reduces the surface depletion region in the NWs. The surface functionalization of the ZnO NWs with carbon nanodots also impacts the dynamics of the photocurrent decay, inducing a slower relaxation of the photogenerated charge carriers.
- Subjects :
- Materials science
Band gap
Nanowire
02 engineering and technology
010402 general chemistry
01 natural sciences
Depletion region
Nanotechnology
Physical and Theoretical Chemistry
Photocurrent
business.industry
Nanotecnologia
Photoconductivity
Nanostructured materials
021001 nanoscience & nanotechnology
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Photoexcitation
General Energy
Optoelectronics
Surface modification
Charge carrier
Materials nanoestructurats
0210 nano-technology
business
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Dipòsit Digital de la UB, Universidad de Barcelona, Recercat. Dipósit de la Recerca de Catalunya, instname
- Accession number :
- edsair.doi.dedup.....0f3bfad7d04c7d7e22d920f730867526