Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > A researcher at the UJI generates high electron mobility gases in semiconductor nanowires for the first time

Miquel RoyoCredit: DAMIÁN LLORENS
Miquel Royo

Credit: DAMIÁN LLORENS

Abstract:
Nanotechnology, optics and photovoltaic energy are among the fields that can benefit from advances in knowledge on semiconductor nanowire systems. Researchers at the Universitat Jaume I in Castelló (UJI), the Consiglio Nazionale delle Ricerche in Italy and the Walter Schottky Institut in Germany have succeeded to prove, for the first time, the accumulation of high electron mobility gases in multilayer nanowires from a technique called "remote doping".

A researcher at the UJI generates high electron mobility gases in semiconductor nanowires for the first time

Valencia, Spain | Posted on June 16th, 2014

This technique, which is currently being used as standard in industry, has allowed for more than 35 years to obtain high electron mobility devices typically based on multilayer planar structures. Research published in the journal Nano Letters collects for the first time the obtaining of these high mobility electrons in an entirely new morphology, such as gallium arsenide nanowires, a hexagonal tube at nanoscale growing on a silicon surface and radially coated with other semiconductor materials. This unique multilayer structure can create spaces in nanowires where electrons move free of impurities at high speed. In this sense, Miquel Royo, researcher at the Quantum Chemistry Group at the UJI, stresses that they have achieved "the highest electron mobility in semiconductor nanowires that has been published to date".

The study showed that the experimental measurements performed by German researchers on doped nanowires are consistent with computer simulations carried out by the researcher at the UJI, in which the existence of a high electron mobility gas in the nanowire is assumed. Theoretical simulations of the system have also led to the conclusion that "the resulting electron gas has a mixed dimensionality. The electrons tend to be located at the interfaces between the different layers of the nanowire, which gives them a two-dimensional character. However, due to the peculiar hexagonal shape of the nanowires and the repulsion between the electrons, it has been observed that these are accumulated predominantly at the vertex of the heterostructure, thus forming unidimensional channels.

Without needing doping elements

The journal Nano Letters recently published a new study by the same researcher at the Quantum Chemistry Group at the UJI in collaboration with researchers from the Laboratoire National des Champs Mannétiques Intenses in Toulouse (France). In this study, they have managed to generate again electronic gases in multilayer nanowires, but this time without requiring the introduction of doping elements intentionally.

The study shows that a thin layer of gallium arsenide grown on the nanowire between two aluminum arsenide layers acts as a trap for the carbon atoms that are present in all growth chamber. "The carbon accumulated in the nanowire acts, in turn, as a dopant that has not been intentionally added, and it creates the appearance, in this case, of an electron hole gas", explains Royo, noting that "in this way, we get an alternative technique for obtaining electronic gases in this complex technical systems". The verification of the presence of electron hole gas in the nanowires was carried out by confronting experimental measurements of photoluminescence with computer simulations performed by the same researcher at the UJI.

The results presented in both publications represent important technological advances, especially in the field of nanoelectronics, "that is particularly useful to have nanodevices in which the mobility of electrons is so high, especially for high frequency applications such as mobile phones that require that you have a low power dissipation", says the researcher at the Universitat Jaume I. He adds that "once we are able to reproducibly grow this new type of semiconductor nanostructures, they will represent an ideal scenario to study the fundamental properties of high mobility electronic gases in new mixed dimensionality morphologies".


Full bibliographic information

Stefan Funk, Miguel Royo, Ilaria Zardo, Daniel Rudolph, Stefanie Morkötter, Benedikt Mayer, Jonathan Becker, Alexander Bechtold , Sonja Matich, Markus Döblinger , Max Bichler, Gregor Koblmüller, Jonathan J. Finley, Andrea Bertoni, Guido Goldoni, and Gerhard Abstreiter "High Mobility One- and Two-Dimensional Electron Systems in Nanowire-Based Quantum Heterostructures" Nano Letters, 2013, 13 (12), pp 6189-6196

J. Jadczak, P. Plochocka, A. Mitioglu, I. Breslavetz, M. Royo, A. Bertoni , G. Goldoni, T. Smolenski, P. Kossacki, A. Kretinin, Hadas Shtrikman and D. K. Maude "Unintentional High-Density p-Type Modulation Doping of a GaAs/AlAs Core-Multishell Nanowire" Nano Letters, 2014, 14 (5), pp 2807-2814

####

For more information, please click here

Contacts:
Lauren Kelly Wickman
+34 961625478

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Diamonds closer to becoming ideal semiconductors: Researchers find new method for doping single crystals of diamond May 25th, 2016

Light can 'heal' defects in new solar cell materials: Defects in some new electronic materials can be removed by making ions move under illumination May 24th, 2016

Attosecond physics: A switch for light-wave electronics May 24th, 2016

Supercrystals with new architecture can enhance drug synthesis May 24th, 2016

Chip Technology

Diamonds closer to becoming ideal semiconductors: Researchers find new method for doping single crystals of diamond May 25th, 2016

Dartmouth team creates new method to control quantum systems May 24th, 2016

Attosecond physics: A switch for light-wave electronics May 24th, 2016

Physicists create first metamaterial with rewritable magnetic ordering May 23rd, 2016

Nanoelectronics

Researchers demonstrate size quantization of Dirac fermions in graphene: Characterization of high-quality material reveals important details relevant to next generation nanoelectronic devices May 20th, 2016

Graphene: A quantum of current - When current comes in discrete packages: Viennese scientists unravel the quantum properties of the carbon material graphene May 20th, 2016

New type of graphene-based transistor will increase the clock speed of processors: Scientists have developed a new type of graphene-based transistor and using modeling they have demonstrated that it has ultralow power consumption compared with other similar transistor devices May 19th, 2016

Self-healing, flexible electronic material restores functions after many breaks May 17th, 2016

Discoveries

Diamonds closer to becoming ideal semiconductors: Researchers find new method for doping single crystals of diamond May 25th, 2016

Light can 'heal' defects in new solar cell materials: Defects in some new electronic materials can be removed by making ions move under illumination May 24th, 2016

Attosecond physics: A switch for light-wave electronics May 24th, 2016

Supercrystals with new architecture can enhance drug synthesis May 24th, 2016

Announcements

Diamonds closer to becoming ideal semiconductors: Researchers find new method for doping single crystals of diamond May 25th, 2016

Light can 'heal' defects in new solar cell materials: Defects in some new electronic materials can be removed by making ions move under illumination May 24th, 2016

Attosecond physics: A switch for light-wave electronics May 24th, 2016

Supercrystals with new architecture can enhance drug synthesis May 24th, 2016

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Diamonds closer to becoming ideal semiconductors: Researchers find new method for doping single crystals of diamond May 25th, 2016

Dartmouth team creates new method to control quantum systems May 24th, 2016

Light can 'heal' defects in new solar cell materials: Defects in some new electronic materials can be removed by making ions move under illumination May 24th, 2016

Attosecond physics: A switch for light-wave electronics May 24th, 2016

Energy

Light can 'heal' defects in new solar cell materials: Defects in some new electronic materials can be removed by making ions move under illumination May 24th, 2016

Technique improves the efficacy of fuel cells: Research demonstrates a new phase transition from metal to ionic conductor May 18th, 2016

This 'nanocavity' may improve ultrathin solar panels, video cameras and more May 16th, 2016

New research shows how silver could be the key to gold-standard flexible gadgets: Silver nanowires are an ideal material for current and future flexible touch-screen technologies May 13th, 2016

Industrial

Solliance realizes first up-scaled Perovskite based PV modules with 10% efficiency: Holst Centre, imec and ECN pave the road to upscaling Perovskite PV modules May 10th, 2016

First single-enzyme method to produce quantum dots revealed: Biological manufacturing process, pioneered by three Lehigh University engineers, produces equivalent quantum dots to those made chemically--but in a much greener, cheaper way May 9th, 2016

Visualizing the Lithiation of a Nanosized Iron-Oxide Material in Real Time: Electron microscopy technique reveals the reaction pathways that emerge as lithium ions are added to magnetite nanoparticles May 9th, 2016

Industrial Nanotech, Inc. Expands Distribution Network in US and Internationally May 9th, 2016

Photonics/Optics/Lasers

Attosecond physics: A switch for light-wave electronics May 24th, 2016

Photon collisions: Photonic billiards might be the newest game! May 20th, 2016

We’ll Leave the Lights On For You: Photonics advances allow us to be seen across the universe, with major implications for the search for extraterrestrial intelligence, says UC Santa Barbara physicist Philip Lubin - See more at: http://www.news.ucsb.edu/2016/016805/we-ll-leave-li May 17th, 2016

UW researchers unleash graphene 'tiger' for more efficient optoelectronics May 16th, 2016

Solar/Photovoltaic

Light can 'heal' defects in new solar cell materials: Defects in some new electronic materials can be removed by making ions move under illumination May 24th, 2016

This 'nanocavity' may improve ultrathin solar panels, video cameras and more May 16th, 2016

New research shows how silver could be the key to gold-standard flexible gadgets: Silver nanowires are an ideal material for current and future flexible touch-screen technologies May 13th, 2016

Solliance realizes first up-scaled Perovskite based PV modules with 10% efficiency: Holst Centre, imec and ECN pave the road to upscaling Perovskite PV modules May 10th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic