Navigation Links
NREL and partners demonstrate quantum dots that assemble themselves
Date:2/20/2013

Scientists from the U.S. Department of Energy's National Renewable Energy Laboratory and other labs have demonstrated a process whereby quantum dots can self-assemble at optimal locations in nanowires, a breakthrough that could improve solar cells, quantum computing, and lighting devices.

A paper on the new technology, "Self-assembled Quantum Dots in a Nanowire System for Quantum Photonics," appears in the current issue of the scientific journal Nature Materials.

Quantum dots are tiny crystals of semiconductor a few billionths of a meter in diameter. At that size they exhibit beneficial behaviors of quantum physics such as forming electron-hole pairs and harvesting excess energy.

The scientists demonstrated how quantum dots can self-assemble at the apex of the gallium arsenide/aluminum gallium arsenide core/shell nanowire interface. Crucially, the quantum dots, besides being highly stable, can be positioned precisely relative to the nanowire's center. That precision, combined with the materials' ability to provide quantum confinement for both the electrons and the holes, makes the approach a potential game-changer.

Electrons and holes typically locate in the lowest energy position within the confines of high-energy materials in the nanostructures. But in the new demonstration, the electron and hole, overlapping in a near-ideal way, are confined in the quantum dot itself at high energy rather than located at the lowest energy states. In this case, that's the gallium-arsenide core. It's like hitting the bulls-eye rather than the periphery.

The quantum dots, as a result, are very bright, spectrally narrow and highly anti-bunched, displaying excellent optical properties even when they are located just a few nanometers from the surface a feature that even surprised the scientists.

"Some Swiss scientists announced that they had achieved this, but scientists at the conference had a hard time believing it,"
'/>"/>

Contact: David Glickson
david.glickson@nrel.gov
303-275-4097
DOE/National Renewable Energy Laboratory
Source:Eurekalert

Page: 1 2

Related biology technology :

1. Organovo Partners With ZenBio to Create 3D Tissue Models
2. Transformation Dental Partners Launch Ground Breaking Cavity Prevention Program that Can Lower Tooth Decay Rates by 74%
3. Qualitas Health and Valicor Renewables Announce Strategic Partnership to Commercialize Algae-Based Omega-3 Supplements
4. Taylor-Wharton CryoScience 'Partners For Life' Awards Liquid Nitrogen Freezer to Comprehensive Cancer Center at University of Alabama at Birmingham
5. Tonicology LLC Partners with Taiwan's CGB, Corp. to Offer Pure Extracts of Rare Herbal Supplements
6. The Veterinary Bioscience Institute Partners with LabRoots to Produce Laboratory Animal Science BioConference Live
7. Touch Medical Media Splits From Touch Briefings, Launches a Series of Cutting Edge, Free to Access, Educational Resources and Signs an Updated Media Partnership With ECCO, The European CanCer Organisation Representing 60,000 Oncology Professionals
8. 5AM Solutions and LABVANTAGE Announce Partnership
9. GlycoCheck Announces Partnership in the United States with Vascular Health Sciences
10. Formedix Partners with Perceptive Informatics for Forthcoming Webcast, “Four Secrets to Using CDISC Standards to Enable Clinical Trial Efficiencies”
11. Wake Forest Innovations Partners with Veterinary Bioscience Institute to Develop Educational Programs for Life Science Professionals
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/24/2014)... OAK RIDGE, Tenn., July 24, 2014 -- A novel ... at the Department of Energy,s Oak Ridge National Laboratory ... known for its unusual physical and electrochemical properties. ... examined how oxygen affects the surface of a perovskite ... electronic behavior. The new avenue to understand surface behavior ...
(Date:7/24/2014)... Security forces worldwide rely on sophisticated equipment, trained ... other public areas against terrorist attacks. A revolutionary ... about to make their job much easier. , ... Patolsky of Tel Aviv University ,s School of ... developed by the Herzliya company Tracense, picks up ...
(Date:7/24/2014)... DUBLIN , July 24, 2014 ... the "Global Cell Culture Market 2014-2018" report ... Cell culture is the in vitro ... such as research, cell studies, and biopharmaceutical production. Cell ... vaccine production. Cell culture instruments and cell culture consumables ...
(Date:7/24/2014)... Three companies from the angelMD network ... C Competition. Out of 700 competition entrants, Chiron Health, ... semi-final round. In this round twenty teams are invited ... with mentoring from thought-leaders and medical entrepreneurs from all ... angelMD commitment to the Livestrong vision around the Big ...
Breaking Biology Technology:ORNL study reveals new characteristics of complex oxide surfaces 2Nano-sized chip 'sniffs out' explosives far better than trained dogs 2Global Cell Culture Market 2014-2018: Key Vendors are Becton, Dickinson and Co, EMD, GE Healthcare, Lonza Group, Sigma Aldrich and Thermo Fisher Scientific 23 angelMD Startups Make Livestrong Big C Semi-finals 2
... Spherix,Incorporated (Nasdaq: SPEX ) reported a net ... The Company,s research and development costs,jumped to $5.9 million ... of,the Company,s Phase 3 clinical trial for Naturlose as ... trial is expected to last at least two years,and ...
... Meets LEEDS Standards for Sustainable Development, PLEASANTON, ... today announced the opening of its new research ... The,building represents the final phase of consolidation of ... which now houses close to 500,employees, including 120 ...
... Ratcliff, the,award-winning architecture, planning and interiors firm, ... care tower,accompanied by a 767-stall parking garage and ... - Walnut Creek Campus. The Thomas J.,and Muriel ... ground will add,230 private and six semi-private rooms, ...
Cached Biology Technology:Spherix Reports 2007 Financial Results 2Roche Molecular Diagnostics Invests $57.5 Million in 'Green' Research Building 2Roche Molecular Diagnostics Invests $57.5 Million in 'Green' Research Building 3Ratcliff Designs Hospital of the Future for John Muir Medical Center - Walnut Creek Campus 2Ratcliff Designs Hospital of the Future for John Muir Medical Center - Walnut Creek Campus 3
(Date:7/24/2014)... 24, 2014 -- Keryx Biopharmaceuticals, Inc. (Nasdaq:KERX) (the "Company") ... active control Phase 3 study of Zerenex (ferric citrate), ... the treatment of hyperphosphatemia in patients with end-stage renal ... and iRon delivery with FErric CiTrate in EsrD) was ... American Society of Nephrology ( JASN ). ...
(Date:7/24/2014)... numbers have decreased by 45% on average over a ... reports a study on the impact of humans on ... enormous benefits invertebrates such as insects, spiders, crustaceans, slugs ... and pest control for crops, decomposition for nutrient cycling, ... in Science and led by UCL, Stanford ...
(Date:7/24/2014)... the product of 3.5 billion years of evolutionary trial ... life. But it may be reaching a tipping point. ... analysis of data published in Science , an ... decline of animals is contributing to what appears to ... biological extinction event. , Since 1500, more than 320 ...
Breaking Biology News(10 mins):Zerenex™ (ferric citrate) long-term Phase 3 study results published in JASN 2Zerenex™ (ferric citrate) long-term Phase 3 study results published in JASN 3Zerenex™ (ferric citrate) long-term Phase 3 study results published in JASN 4Invertebrate numbers nearly halve as human population doubles 2Invertebrate numbers nearly halve as human population doubles 3Stanford biologist warns of early stages of Earth's 6th mass extinction event 2Stanford biologist warns of early stages of Earth's 6th mass extinction event 3
... online citizen-science project launches called "Plankton Portal" ... Rosenstiel School of Marine and Atmospheric Sciences (RSMAS) in ... and the National Science Foundation (NSF) and developers at ... ocean from the comfort of your own home. You ...
... two typhoons over a three-week period in August, ... partnership with the Okinawa Institute of Science and ... OceanCube Observatory System in waters off Motobu Peninsula, ... to ecologically significant coral reefs. The observatory system ...
... research group from Singapore, scientists at University of Copenhagen ... of truncated O-glycans aid growth properties of cancer cells. ... significance of these truncated O-glycans, and therefore, the results, ... , represent an important contribution to understanding the growth ...
Cached Biology News:Online citizen scientists: Classify plankton images 2Establishing world-class coral reef ecosystem monitoring in Okinawa 2Establishing world-class coral reef ecosystem monitoring in Okinawa 3Specific sugar molecule causes growth of cancer cells 2
... Useful as a positive control for ... to chromatin in vivo is a crucial ... extent of crosslinking is probably the most ... subsequent immunoprecipitation step should be taken into ...
Mouse monoclonal [M2II-12] to MRP2 ( Abpromise for all tested applications). entrezGeneID: 1244 SwissProtID: Q92887...
The Programmable MP-5000P-F Power Supply can be applied for any Microfluidic application....
Rab GDP dissociation inhibitor beta...
Biology Products: