Navigation Links
'Hybrid' semiconductors show zero thermal expansion; Could lead to hardier electronics
Date:12/19/2007

ARGONNE, Ill. (Dec. 19, 2007) The fan in your computer is there to keep the microprocessor chip from heating to the point where its component materials start to expand, inducing cracks that interrupt the flow of electricity and not incidentally, ruin the chip. Thermal expansion can also separate semiconducting materials from the substrate, reduce performance through changes in the electronic structure of the material or warp the delicate structures that emit laser light.

Recently published research by scientists at the U.S. Department of Energy's (DOE) National Renewable Energy Laboratory (NREL) and Argonne National Laboratory and academic institutions has shed light on a semiconducting material with zero thermal expansion (ZTE). The research may play a role in the design of future generations of electronics and optoelectronics that can withstand a wide range of temperatures.

Traditional interests in ZTE materials have largely been in areas such as optics, heat-engine components and kitchenware. ZTE materials with applications in non-conventional areas such as electronics and optoelectronics are rare; most are glasses, which do not work well in electronics applications. The hybrid inorganic-organic semiconductor investigated in this work is a multifunctional semiconductor that has previously been shown to possess superior electronic and optical properties. The work also suggests an alternative route to designing materials with any desired positive or negative thermal expansion.

Its a merger of inorganic and organic materials, said Zahirul Islam, a physicist in Argonnes X-Ray Science Division, which form a fully coherent, three-dimensionally ordered crystal. Normally inorganic and organic materials don't work very well together, but here they are working together to display these remarkable properties.

The materials under study form alternating organic and inorganic layers that work together to produce these effects. One contracts while the other expands, and the net effect is zero.

This work suggests a novel approach to design the thermal expansion from positive to negative, including zero in a nanoscopic scale by assembling nano-scale units in an ordered manner, said principal investigator Yong Zhang of NREL. The idea has only been demonstrated for tuning thermal expansion in one dimension and study was limited to one or two materials. Next, we would like to extend the idea to higher dimensions (i.e., ZTE in more than one dimension), and explore more inorganic-organic combinations.

These hybrid materials hold promise for high-efficiency semiconductor lasers, ultrathin and flexible solar cells and light-emitting and detecting devices. It is possible to dope the materials (adding small amounts of other compounds) to form transparent conducting materials, Zhang said.

While chemical and thermal stability are two major problems for most hybrids, the hybrid nanostructures investigated in this work are found to be exceptionally stable in the air, even under the illumination of an ultraviolet laser.

Not only do the crystal structures remain unchanged, Zhang said, but their electronic and optical properties remain after a few years of air exposure or upon heating to more than 200 degrees C, a feature attributed to the strong covalent bonding throughout the structure.


'/>"/>

Contact: Steve McGregor
smcgregor@anl.gov
630-252-5580
DOE/Argonne National Laboratory
Source:Eurekalert

Related biology technology :

1. DuPont Congratulates Growers Planting Pioneer(R) Brand Sorghum Hybrids in Winning Majority of National Categories in Yield Contest
2. The next generation: nanomagnets could replace semiconductors
3. Novel Angiogenic Drugs, Including a Future Blockbuster from Genzyme, Could Revolutionize Treatment of Peripheral Arterial Disease
4. Nanotech could make solar energy as easy and cheap as growing grass
5. Bone-growing nanomaterial could improve orthopaedic implants
6. Stem Cell Breakthrough Could End Human Embryonic Experimentation
7. FED-TVs with carbon nanotube technology could supersede plasma and LCD flat screens
8. Blue dye could hold the key to super processing power
9. ORNL super water repellent could cause big wave in market
10. Tethered to chip, energy supply that drives sperm could power nanobot
11. DelSite Nasal Powder Technology Could Reduce Recently Reported Waste in Federal Vaccine Program
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/10/2016)... 2016 ASAE is introducing a hybrid membership ... (AMC) the option of joining or renewing through an ... by staff size, every employee in any size association ... reap all available member benefits.   John ... membership options will allow organizations of any size and ...
(Date:2/10/2016)... 2016  Matchbook, Inc., a company specializing in ... companies, announced today the appointment of Jim ... brings nearly 25 years of experience in supply ... nearly two decades in executive level roles as ... Genzyme and, most recently headed global logistics and ...
(Date:2/10/2016)... Charlotte, NC (PRWEB) , ... February 10, 2016 ... ... highly anticipated expansion to their comprehensive training and support program, Sonalinkā„¢ remote monitoring. ... Sonablate® HIFU procedures performed on Friday, February 5th, connecting Dr. Samuel Peretsman to ...
(Date:2/10/2016)... ... 2016 , ... Cenna Bioscience Inc., an emerging biopharmaceutical company focused on the ... it has been selected to present at the Cavendish Global Health Impact Forum taking ... The purpose of the Forum is to help family offices and foundations develop and ...
Breaking Biology Technology:
(Date:2/1/2016)... NEW YORK , Feb. 1, 2016  Today, ... Heart Association (AHA) announced plans to develop a first ... cognitive computing power of IBM Watson. In the first ... disease, AHA, IBM (NYSE: IBM ), and Welltok ... metrics and health assessments with cognitive analytics, delivered on ...
(Date:1/25/2016)... Jan. 25, 2016  Glencoe Software, the world-leading supplier ... publication industries, will provide the data management solution OMERO ... Photo ... Phenotypic analysis measures the characteristics ... allowing comparisons between states such as health and disease, ...
(Date:1/20/2016)... --  MedNet Solutions , an innovative SaaS-based eClinical technology ... is pleased to announce the attainment of record-setting corporate ... of the company,s laser focus on (and growing international ... comprehensive, easy-to-use and highly affordable cloud-based technology platform. ... growth achievements in 2015 include: , Record ...
Breaking Biology News(10 mins):