Navigation Links
Watching crystals grow provides clues to making smoother, defect-free thin films
Date:1/23/2010

To make thin films for semiconductors in electronic devices, layers of atoms must be grown in neat, crystalline sheets. But while some materials grow smooth crystals, others tend to develop bumps and defects a serious problem for thin-film manufacturing.

In the online edition of the journal Science (Jan. 22, 2010), Cornell researchers shed new light on how atoms arrange themselves into thin films. Led by assistant professor of physics Itai Cohen, they recreated conditions of layer-by-layer crystalline growth using particles much bigger than atoms, but still small enough that they behave like atoms.

"These particles are big and slow enough that you can see what's going on in real time," explained graduate student Mark Buckley. Using an optical microscope, the scientists could watch exactly what their "atoms" actually, micron-sized silica particles suspended in fluid did as they crystallized. What's more, they were able to manipulate single particles one at a time and test conditions that lead to smooth crystal growth. In doing so, they discovered that the random darting motion of the particles is a key factor that affects how the crystals grow.

A major challenge to growing thin films with atoms is that the atoms often form mounds, rather than crystallizing into thin sheets. This happens because as atoms are deposited onto a substrate, they initially form small crystals, called islands. When more atoms are dumped on top of these crystals, the atoms tend to stay atop the islands, rather than hopping off the edges - as though there were a barrier on the crystals' edges. This creates the pesky rough spots, "and it's game over" for a perfect thin film, Cohen said.

Conventional theory says that atoms that land on top of islands feel an energetic "pull" from other atoms that keeps them from rolling off. In their colloidal system, the researchers eliminated this pull by shortening the bonds between their particles. B
'/>"/>

Contact: Blaine Friedlander
bpf2@cornell.edu
607-254-8093
Cornell University
Source:Eurekalert

Page: 1 2

Related biology technology :

1. Strain on nanocrystals could yield colossal results
2. Physicists discover important step for making light crystals
3. New imaging technique reveals the atomic structure of nanocrystals
4. Silicon photonic crystals key to optical cloaking, researchers say
5. 3-D photonic crystals will revolutionize telecommunications
6. Discovery provides new drug targets for malaria cure
7. BioMS Medical provides corporate update
8. Access Pharmaceuticals Provides Update on MuGard Commercial Launch in Europe
9. PDL BioPharma Provides Fourth Quarter 2009 Revenue Guidance of Approximately $57 Million
10. Sangamo BioSciences Provides Update on Phase 1 Safety Trial of SB-728-T for HIV/AIDS
11. AMT Provides Business Update for the Third Quarter 2009
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/15/2014)... AudioNotch is the internet's leading provider of ... of tinnitus. Patients listen to sound therapy that is ... of weeks to months, their tinnitus volume decreases. , AudioNotch ... Music and Notched White Noise. Now, AudioNotch is pleased to ...
(Date:1/14/2014)... Carahsoft and CDS Federal Services have ... at 2pm EST (11am PST), “Natural Language Processing: Converting ... how technology can turn raw, heterogeneous data into actionable ... The online webinar will last approximately one hour. , ...
(Date:1/14/2014)... pet owners drew up their lists of New Year,s resolutions for ... of my furry companion." Nowadays there are pet salons, dog and ... take the little canine or feline darlings along wherever mommy or ... pricey toys at the pet store. But anyone who has ever ...
(Date:1/14/2014)... and BETHESDA, Md. , Jan. 14, ... with two institutes from the National Institutes of Health ... bringing safer, more effective treatments to patients on a ... for Advancing Translational Sciences (NCATS) and the National Eye ...
Breaking Biology Technology:Webcast - Natural Language Processing: Converting Raw Data into Actionable Knowledge – Hosted by Carahsoft and CDS Federal Services 2New Year's Resolution: Give Pets the Gift of Top-Notch Health Care 2Organovo Announces Collaboration with National Institutes of Health 2Organovo Announces Collaboration with National Institutes of Health 3
... EASTON, Mass., March 6 Pressure,BioSciences, Inc. (Nasdaq: ... teleconference to discuss its 2007 financial results and to ... teleconference either,by telephone or through a live web-cast. The ... March 12, 2008, Time: 4:30 p.m. Eastern Daylight ...
... to Support European Partnerships, ALAMEDA, Calif., and ... collaboration with Novartis Pharma AG to give Novartis,access ... Technology Access Program (ETAP). Terms of the collaboration,were ... opening of a,facility in Paris, France to support ...
... Recently the State of,Brandenburg, and the EU, ... Alcat Europe, GmbH, covering marketing and employee costs ... laboratory company located in the BioTech Park in,Hennigsdorf ... food and,chemical sensitivities through the Alcat test method. ...
Cached Biology Technology:Pressure BioSciences, Inc. to Discuss 2007 Financial Results and Provide Business Update 2Singulex Collaborates With Large Pharmaceutical Company in Erenna(TM) Technology Access Program 2European Union, State of Brandenburg, Award Grants to Alcat Europe, GmbH 2
(Date:4/23/2014)... is a technique used to read quickly. It ... skipping non-essential words and/ or sentences. Similarly to ... to quickly "read" genetic information. Genes that need ... the smaller the encoding message, the easier it ... from Instituto Gulbenkian de Cincia (IGC, Portugal) and ...
(Date:4/22/2014)... of Yale researchers will lead a five-year, $3 million ... events is affecting the transport of dissolved organic matter ... say could alter the chemical composition and water quality ... funding from the National Science Foundation,s MacroSystems Biology program, ... the watershed, which begins in Canada and runs through ...
(Date:4/22/2014)... International Science Consortium Ltd.,s nanotechnology expert will present a ... hazard assessment" at the 7th International Nanotoxicology Congress ... Turkey. , Dr. Monita Sharma will outline a ... National Academy of Sciences, " Toxicity Testing in the ... recommends use of non-animal methods involving human cells and ...
Breaking Biology News(10 mins):Cell division speed influences gene architecture 2Connecticut River watershed study will assess impacts of extreme rain events 2Connecticut River watershed study will assess impacts of extreme rain events 3
... 2012 The Crop Science Society of America (CSSA) announces ... their Annual Meetings, Oct. 21-24, 2012 in Cincinnati, OH. Members ... achievements and meritorious service. Only 0.3 percent of the Society,s ... class of CSSA Fellows are: Marc C. Albertsen, ...
... biological cells like a skin. They also surround organelles ... division. Scientists have long known in principle how biomembranes ... a role in maintaining the optimal distance between neighboring ... with the help of computer simulations, scientists of the ...
... Bioluminescence may play a key role in successful foraging ... research published Aug. 29 in the open access journal ... led by Jade Vacqui-Garcia, monitored the diving behaviour of ... Ocean that were also equipped with light detectors. The ...
Cached Biology News:Crop Science Society of America presents 2012 class of fellows 2Crop Science Society of America presents 2012 class of fellows 3Keep your distance! Why cells and organelles don't get stuck 2
...
... provides a familiar interface for data ... warehousing. The transition from paper to ... LABTrack contains an integrated LIMS, ... rules mechanism. These functions allow LABTrack ...
... Science Major Science MS 300V (Cat. No. ... designed to meet most electrophoresis needs in ... Major Science MS 300V power supply ... instruments used in electrophoresis. 4 pairs of ...
... Programmable Power Supply are high-performance, easy ... virtually any application from high voltage ... is unique in offering both graphic ... Programmable Power Supply is completely programmable ...
Biology Products: