Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Discovery of Current Spike Phenomenon in Semiconductor Materials

Abstract:
Discovery of Current Spike Phenomenon in Semiconductor Materials
Leads to New Understanding of Nanoscale Plasticity
Plasticity in certain semiconductor materials at the nanoscale is actually linked to phase transformation rather than dislocation nucleation, as previously thought. This is shown by the results of an international research team led by Professor Roman Nowak of the Nordic Hysitron Laboratory (NHL) at Helsinki University of Technology, just published in the Nature Nanotechnology journal in an article entitled "An electric current spike linked to nanoscale plasticity". The research is part of the Academy of Finland's FinNano research programme.

Discovery of Current Spike Phenomenon in Semiconductor Materials

Helsinki, Finland | Posted on April 1st, 2009

Plasticity has always been associated with defect movement or initiation, but Nowak's team has proved that plasticity can indeed start from non-dislocation processes, and that this phase transformation occurs in a stressed nano-volume, changing from one crystalline structure to another without affecting defect activity. The phenomenon, named the "Current Spike", is clearly visible, and its explanation relies heavily on advanced physics.

"The implications of these findings are such that our understanding of material behavior in the nano-regime may just need to be revised once again. If this approach is further developed to encompass other sets of materials than the ones studied here, this new evidence will certainly lead to many advances in pressure-sensing and pressure-switching applications, just to name one of many potential benefactors of these newly-revealed discoveries," Nowak says.

While certainly enlightening on their own, the NHL's recently-published findings represent the first critical steps towards addressing an intriguing larger issue: Under which conditions and at which length scales does combined mechanical-electrical coupling lead to similar effects? NHL will be leading the way and acting as a source of inspiration in this quest for understanding of the deformation of materials at nanoscale.

The main target of NHL is the mechanical characterization of advanced materials and nanostructures using the nanoindentation testing technique. An instrument developed by Hysitron, Inc. of Minneapolis, USA allows for a quantitative and concurrent measurement of the mechanical and electrical properties. These experiments are complemented by computational methods, with the aim of exploring nanometer-size contacts in the material and arrive at the final unique clarification.

The NHL's success stems from well-targeted and carefully-organised collaboration with the best experts in the field. Both the NHL's efficiency and effectiveness are demonstrated by the recent publication, which was only made possible by virtue of the synergistic combination of the expertise in atomistic calculations of Professor Nowak and two visiting researchers, together with sophisticated nano-experimentation by Hysitron, Inc, USA, and a top proficiency in the production of advanced semiconductors at the Tampere University of Technology.

More information: Professor Roman Nowak, Nordic Hysitron Laboratory, Department of Materials Science and Engineering, Helsinki University of Technology, email tel. (09) 451 2667

"An electric current spike linked to nanoscale plasticity", R. Nowak, D. Chrobak, and S.Nagao, NHL, D. Vodnick and M. Berg, Hysitron Inc., A. Tukiainen and M. Pessa, Tampere University of Technology.

Nature Nanotechnology. on-line version: 22 March 2009 | doi:10.1038/nnano.2009.49
www.nature.com/nnano/journal/vaop/ncurrent/abs/nnano.2009.49.html

####

About Academy of Finland
The Academy of Finland’s mission is to advance scientific research and its application, support international scientific cooperation, act as an expert organ in science policy issues and allocate funding to research and other advancement of science.

For more information, please click here

Contacts:
Academy of Finland Communications
Communications Specialist Leena Vähäkylä
tel. (09) 7748 8327

Copyright © Academy of Finland

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

Iran to Hold 3rd Int'l Engineering Materials, Metallurgy Conference October 25th, 2014

Haydale Secures Exclusive Development and Supply Agreement with Tantec A/S: New reactors to be built and commissioned by Tantec A/S represent another step forward towards the commercialisation of graphene October 24th, 2014

QuantumWise guides the semiconductor industry towards the atomic scale October 24th, 2014

SUNY Polytechnic Institute Invites the Public to Attend its Popular Statewide 'NANOvember' Series of Outreach and Educational Events October 23rd, 2014

Possible Futures

Imaging electric charge propagating along microbial nanowires October 20th, 2014

Superconducting circuits, simplified: New circuit design could unlock the power of experimental superconducting computer chips October 18th, 2014

Nanocoatings Market By Product Is Expected To Reach USD 8.17 Billion By 2020: Grand View Research, Inc. October 15th, 2014

Perpetuus Carbon Group Receives Independent Verification of its Production Capacity for Graphenes at 140 Tonnes per Annum: Perpetuus Becomes the First Manufacturer in the Sector to Allow Third Party Audit October 7th, 2014

Chip Technology

QuantumWise guides the semiconductor industry towards the atomic scale October 24th, 2014

Strengthening thin-film bonds with ultrafast data collection October 23rd, 2014

NIST offers electronics industry 2 ways to snoop on self-organizing molecules October 22nd, 2014

Materials for the next generation of electronics and photovoltaics: MacArthur Fellow develops new uses for carbon nanotubes October 21st, 2014

Sensors

MEMS & Sensors Technology Showcase: Finalists Announced for MEMS Executive Congress US 2014 October 23rd, 2014

Journal Nanotechnology Progress International (JONPI), 2014, Volume 5, Issue 1, pp 1-24 October 22nd, 2014

Imaging electric charge propagating along microbial nanowires October 20th, 2014

Graphenea opens US branch October 16th, 2014

Discoveries

QuantumWise guides the semiconductor industry towards the atomic scale October 24th, 2014

Iranian, Malaysian Scientists Study Nanophotocatalysts for Water Purification October 23rd, 2014

Nanoparticle technology triples the production of biogas October 23rd, 2014

Strengthening thin-film bonds with ultrafast data collection October 23rd, 2014

Announcements

Iran to Hold 3rd Int'l Engineering Materials, Metallurgy Conference October 25th, 2014

Haydale Secures Exclusive Development and Supply Agreement with Tantec A/S: New reactors to be built and commissioned by Tantec A/S represent another step forward towards the commercialisation of graphene October 24th, 2014

QuantumWise guides the semiconductor industry towards the atomic scale October 24th, 2014

Strengthening thin-film bonds with ultrafast data collection October 23rd, 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