Journal
NANO LETTERS
Volume 16, Issue 5, Pages 3260-3267Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b00806
Keywords
GaN; AlN; nanowires; photocurrent spectroscopy; photoluminescence spectroscopy; UV photodetector
Categories
Funding
- EU ERC-SG TeraGaN [278428]
- ANR JCJC COSMOS [ANR-12-JS10-0002]
- LOEWE program of excellence of the Federal State of Hessen
- Generalitat de Catalunya [SGR 1638]
- Spanish MINECO [MAT2014-51480-ERC]
- Severo Ochoa Excellence Program
- ICREA Funding Source: Custom
- European Research Council (ERC) [278428] Funding Source: European Research Council (ERC)
- Agence Nationale de la Recherche (ANR) [ANR-12-JS10-0002] Funding Source: Agence Nationale de la Recherche (ANR)
Ask authors/readers for more resources
We have characterized the photodetection capabilities of single GaN nanowires incorporating 20 periods of AlN/GaN:Ge axial heterostructures enveloped in an AlN shell. Transmission electron microscopy confirms the absence of an additional GaN shell around the heterostructures. In the absence of a surface conduction channel, the incorporation of the heterostructure leads to a decrease of the dark current and an increase of the photosensitivity. A significant dispersion in the magnitude of dark currents for different single nanowires is attributed to the coalescence of nanowires with displaced nanodisks, reducing the effective length of the heterostructure. A larger number of active nanodisks and AlN barriers in the current path results in lower dark current and higher photosensitivity and improves the sensitivity of the nanowire to variations in the illumination intensity (improved linearity). Additionally, we observe a persistence of the photocurrent, which is attributed to a change of the resistance of the overall structure, particularly the GaN stem and cap sections. As a consequence, the time response is rather independent of the dark current.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available