Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button

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

Ageing can drive progress: Population ageing is likely to boost medicine, nanotechnology and robotics, but increase political risks July 27th, 2016

WSU researchers 'watch' crystal structure change in real time: Breakthrough made possible by new Argonne facility July 27th, 2016

Enhancing molecular imaging with light: New technology platform increases spectroscopic resolution by 4 fold July 27th, 2016

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

Chip Technology

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

Nanometrics Reports Second Quarter 2016 Financial Results July 26th, 2016

Borrowing from pastry chefs, engineers create nanolayered composites: Method to stack hundreds of nanoscale layers could open new vistas in materials science July 25th, 2016

Integration of novel materials with silicon chips makes new 'smart' devices possible July 25th, 2016

Nanoelectronics

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

Ultra-flat circuits will have unique properties: Rice University lab studies 2-D hybrids to see how they differ from common electronics July 25th, 2016

Borrowing from pastry chefs, engineers create nanolayered composites: Method to stack hundreds of nanoscale layers could open new vistas in materials science July 25th, 2016

Making magnets flip like cats at room temperature: Heusler alloy NiMnSb could prove valuable as a new material for digital information processing and storage July 25th, 2016

Discoveries

WSU researchers 'watch' crystal structure change in real time: Breakthrough made possible by new Argonne facility July 27th, 2016

Enhancing molecular imaging with light: New technology platform increases spectroscopic resolution by 4 fold July 27th, 2016

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

Scientists test nanoparticle drug delivery in dogs with osteosarcoma July 26th, 2016

Announcements

Ageing can drive progress: Population ageing is likely to boost medicine, nanotechnology and robotics, but increase political risks July 27th, 2016

WSU researchers 'watch' crystal structure change in real time: Breakthrough made possible by new Argonne facility July 27th, 2016

Enhancing molecular imaging with light: New technology platform increases spectroscopic resolution by 4 fold July 27th, 2016

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

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

Ageing can drive progress: Population ageing is likely to boost medicine, nanotechnology and robotics, but increase political risks July 27th, 2016

WSU researchers 'watch' crystal structure change in real time: Breakthrough made possible by new Argonne facility July 27th, 2016

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

Ultrasensitive sensor using N-doped graphene July 26th, 2016

Energy

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

Designing climate-friendly concrete, from the nanoscale up: New understanding of concrete’s properties could increase lifetime of the building material, decrease emissions July 25th, 2016

An accelerated pipeline to open materials research: ORNL workflow system unites imaging, algorithms, and HPC to advance materials discovery and design July 24th, 2016

Researchers discover key mechanism for producing solar cells: Better understanding of perovskite solar cells could boost widespread use July 21st, 2016

Industrial

Scientists move 1 step closer to creating an invisibility cloak July 15th, 2016

Yale researchers’ technology turns wasted heat into power June 27th, 2016

Industrial Nanotech, Inc. Signs Agreement With and Receives First Purchase Order from Major New Customer in China June 6th, 2016

GLOBALFOUNDRIES to Expand Presence in China with 300mm Fab in Chongqing: Company plans new manufacturing facility and additional design capabilities to serve customers in China May 31st, 2016

Photonics/Optics/Lasers

Attosecond physics: Mapping electromagnetic waveforms July 25th, 2016

RMIT researchers make leap in measuring quantum states July 21st, 2016

The birth of quantum holography: Making holograms of single light particles! July 21st, 2016

Graphene photodetectors: Thinking outside the 2-D box July 21st, 2016

Solar/Photovoltaic

New nontoxic process promises larger ultrathin sheets of 2-D nanomaterials July 27th, 2016

An accelerated pipeline to open materials research: ORNL workflow system unites imaging, algorithms, and HPC to advance materials discovery and design July 24th, 2016

Researchers discover key mechanism for producing solar cells: Better understanding of perovskite solar cells could boost widespread use July 21st, 2016

The future of perovskite solar cells has just got brighter -- come rain or shine: Korean researchers at POSTECH have succeeded in developing high-efficiency perovskite solar cells that retain excellent performance over two months in a very humid condition July 21st, 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