Visible-blind photodetector based on p-i-n junction GaN nanowire ensembles

Institut d'Electronique Fondamentale, UMR 8622 CNRS, University Paris Sud XI, Orsay, France.
Nanotechnology (Impact Factor: 3.82). 08/2010; 21(31):315201. DOI: 10.1088/0957-4484/21/31/315201
Source: PubMed


We report the synthesis, fabrication and extensive characterization of a visible-blind photodetector based on p-i-n junction GaN nanowire ensembles. The nanowires were grown by plasma-assisted molecular beam epitaxy on an n-doped Si(111) substrate, encapsulated into a spin-on-glass and processed using dry etching and metallization techniques. The detector presents a high peak responsivity of 0.47 A W(-1) at - 1 V. The spectral response of the detector is restricted to the UV range with a UV-to-visible rejection ratio of 2 x 10(2). The dependence on the incident power and the operation speed of the photodetector are discussed.

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Available from: Andres De Luna Bugallo, Mar 26, 2014
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    • "Wide-bandgap materials, such as III-V nitrides, zinic oxide, silicon carbide, diamond, are much more attractive choices for visible-blind UV detection. Their stable physical properties and inherent visible blindness have motivated extensive research by many groups [3]–[6]. Strontium titanate (SrTiO 3 , STO), with a typical perovskite structure, has a wide optical bandgap of 3.2 eV. "
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    • "One-dimensional nanostructures have brought a large field of new potentialities in many scientific domains such as microelectronics, photovoltaics, sensing … Indeed, due to their small dimensions, they exhibit very special particularities that differ from their corresponding bulk materials, and can be used to realize devices with improved properties. Thus, several research groups have realized 1-D nanostructure-based devices like photodetectors [1], [2], FETs [3], [4], solar cells [5], [6], chemical sensors [7], (…) with 1-D nanostructures as building blocks. Despite these promising marches towards nano-devices, it remains a challenging task to combine high density integration and spatial placement control with simple, cost-effective methods. "
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