Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

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

Tough foam from tiny sheets: Rice University lab uses atom-thick materials to make ultralight foam July 29th, 2014

Zenosense, Inc. July 29th, 2014

Optimum inertial design for self-propulsion: A new study investigates the effects of small but finite inertia on the propulsion of micro and nano-scale swimming machines July 29th, 2014

A new way to make microstructured surfaces: Method can produce strong, lightweight materials with specific surface properties July 29th, 2014

Chip Technology

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Nanometrics Announces Upcoming Investor Events July 22nd, 2014

Penn Study: Understanding Graphene’s Electrical Properties on an Atomic Level July 22nd, 2014

Nanoelectronics

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

3-D nanostructure could benefit nanoelectronics, gas storage: Rice U. researchers predict functional advantages of 3-D boron nitride July 15th, 2014

IBM Announces $3 Billion Research Initiative to Tackle Chip Grand Challenges for Cloud and Big Data Systems: Scientists and engineers to push limits of silicon technology to 7 nanometers and below and create post-silicon future July 10th, 2014

Discoveries

Tough foam from tiny sheets: Rice University lab uses atom-thick materials to make ultralight foam July 29th, 2014

Zenosense, Inc. July 29th, 2014

Optimum inertial design for self-propulsion: A new study investigates the effects of small but finite inertia on the propulsion of micro and nano-scale swimming machines July 29th, 2014

A new way to make microstructured surfaces: Method can produce strong, lightweight materials with specific surface properties July 29th, 2014

Announcements

Tough foam from tiny sheets: Rice University lab uses atom-thick materials to make ultralight foam July 29th, 2014

Zenosense, Inc. July 29th, 2014

Optimum inertial design for self-propulsion: A new study investigates the effects of small but finite inertia on the propulsion of micro and nano-scale swimming machines July 29th, 2014

A new way to make microstructured surfaces: Method can produce strong, lightweight materials with specific surface properties July 29th, 2014

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

ACS Biomaterials Science & Engineering™: Brand-new journal names editor July 29th, 2014

Tough foam from tiny sheets: Rice University lab uses atom-thick materials to make ultralight foam July 29th, 2014

Optimum inertial design for self-propulsion: A new study investigates the effects of small but finite inertia on the propulsion of micro and nano-scale swimming machines July 29th, 2014

A new way to make microstructured surfaces: Method can produce strong, lightweight materials with specific surface properties July 29th, 2014

Energy

Oregon chemists eye improved thin films with metal substitution: Solution-based inorganic process could drive more efficient electronics and solar devices July 21st, 2014

Steam from the sun: New spongelike structure converts solar energy into steam July 21st, 2014

3-D nanostructure could benefit nanoelectronics, gas storage: Rice U. researchers predict functional advantages of 3-D boron nitride July 15th, 2014

Nanotechnology that will impact the Security & Defense sectors to be discussed at NanoSD2014 conference July 8th, 2014

Industrial

Iranian Scientists Produce Transparent Nanocomposite Coatings with Longer Lifetime July 24th, 2014

Compact Vibration Harvester Power Supply with Highest Efficiency Opens Door to “Fix-and-Forget” Sensor Nodes July 23rd, 2014

Non-Enzyme Sensor Detects Lead, Hydrogen Peroxide July 10th, 2014

New Method Introduced for Synthesis of Hydroxyapatite Nanoparticles July 5th, 2014

Photonics/Optics/Lasers

NUS scientists use low cost technique to improve properties and functions of nanomaterials: By 'drawing' micropatterns on nanomaterials using a focused laser beam, scientists could modify properties of nanomaterials for effective applications in photonic and optoelectric applicat July 22nd, 2014

Carbyne morphs when stretched: Rice University calculations show carbon-atom chain would go metal to semiconductor July 21st, 2014

Tiny laser sensor heightens bomb detection sensitivity July 19th, 2014

Future Electronics May Depend on Lasers, Not Quartz July 17th, 2014

Solar/Photovoltaic

Steam from the sun: New spongelike structure converts solar energy into steam July 21st, 2014

Making dreams come true: Making graphene from plastic? July 2nd, 2014

Shrinky Dinks close the gap for nanowires July 1st, 2014

New Study Raises Possibility of Production of P-Type Solar Cells July 1st, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE