Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Nanoparticle technique could lead to improved semiconductors

Abstract:
Devices made from plastic semiconductors, like solar cells and light-emitting diodes (LEDs), could be improved based on information gained using a new nanoparticle technique developed at The University of Texas at Austin.

Nanoparticle technique could lead to improved semiconductors

Austin, TX | Posted on August 6th, 2007

As electrical charges travel through plastic semiconductors, they can be trapped much like a marble rolling on a bumpy surface becomes trapped in a deep hole. These traps of charges are known as "deep traps," and they are not well understood.

Deep traps can be desired, as in the case of plastic semiconductors used for memory devices, but they can also decrease the efficiency of the material to conduct electrical charges. In the case of solar cells, deep traps can decrease the efficiency of the conversion of light into electricity.

To further explore the deep trap phenomenon, a group of scientists led by Professors of Chemistry and Biochemistry Paul Barbara and Allen Bard developed a single-particle technique to study small portions of semiconductor material at the nanoscale.

The scientists reported their findings in the advanced online issue of the journal Nature Materials.

"Our results strongly suggest that deep traps are formed in plastic semiconductors by a charge induced chemical reaction," says Dr. Rodrigo Palacios, lead author and post-doctoral fellow at the Center for Nano and Molecular Science and Technology. "These traps were not there in the uncharged pristine material."

Deep traps could be caused by defects in the semiconductor material—either native to the material or introduced impurities—with special properties that encourage charge trapping. The traps also could develop over the life of the semiconductor.

Previous techniques used to study deep traps have generally involved completed semiconductor devices, which Palacios says creates complications due to the complexity of a functional device.

For the current study, Palacios used a conjugated polymer (plastic semiconductor) material known as F8BT, which is commercially available and has promising applications in organic LEDs and solar cells.

He produced particles of F8BT with diameters about one-ten thousandth that of a human hair. He then shone light on the nanoparticles and measured changes in intensity of the resulting fluorescence. (This type of semiconductor material takes in light energy and releases part of this energy as light of a different color.)

Palacios observed deep traps forming as he electrochemically charged and discharged the semiconductor nanoparticles. The deep traps led to decreases in light emission from the material.

"With our new technique, we got detailed information on how these deep traps are formed and how long they live," says Palacios. "In principle, this kind of information can be used to improve devices made out of these conjugated polymers, designing new materials that can avoid these deep traps or materials that might be able to form these deep traps better."

####

About University of Texas at Austin
Founded in 1883, UT is one of the largest and most respected universities in the nation. The Times of London ranked UT second among U.S. public universities in its ranking of the world's top 200 universities.

For more information, please click here

Contacts:
Dr. Rodrigo Palacios

512-471-5535

Copyright © University of Texas at Austin

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

Display technology/LEDs/SS Lighting/OLEDs

Liquipel Debuts Eyesight-Saving ION-Glass Blue Light Protection for iPhones and Androids at RadioShack Stores Nationwide: Liquipel's Unique Protective Screen, Available at RadioShack, Cuts Harmful Blue Light Implicated in Macular Degeneration by 10x July 28th, 2015

'Seeing' molecular interactions could give boost to organic electronics July 28th, 2015

Reshaping the solar spectrum to turn light to electricity: UC Riverside researchers find a way to use the infrared region of the sun's spectrum to make solar cells more efficient July 27th, 2015

Stretching the limits on conducting wires July 25th, 2015

Chip Technology

Nanometrics Announces Upcoming Investor Events July 28th, 2015

Short wavelength plasmons observed in nanotubes: Berkeley Lab researchers create Ludinger liquid plasmons in metallic SWNTs July 28th, 2015

Quantum networks: Back and forth are not equal distances! July 28th, 2015

Superfast fluorescence sets new speed record: Plasmonic device has speed and efficiency to serve optical computers July 27th, 2015

Discoveries

Laboratorial Performance of Nanocomposite Membrane Improved in Water Purification July 28th, 2015

Perfect Optical Properties in Production of Aluminum Oxide Colloid Nanoparticles July 28th, 2015

Short wavelength plasmons observed in nanotubes: Berkeley Lab researchers create Ludinger liquid plasmons in metallic SWNTs July 28th, 2015

'Seeing' molecular interactions could give boost to organic electronics July 28th, 2015

Announcements

Laboratorial Performance of Nanocomposite Membrane Improved in Water Purification July 28th, 2015

Perfect Optical Properties in Production of Aluminum Oxide Colloid Nanoparticles July 28th, 2015

Short wavelength plasmons observed in nanotubes: Berkeley Lab researchers create Ludinger liquid plasmons in metallic SWNTs July 28th, 2015

'Seeing' molecular interactions could give boost to organic electronics July 28th, 2015

Energy

Smaller, faster, cheaper: A new type of modulator for the future of data transmission July 27th, 2015

Reshaping the solar spectrum to turn light to electricity: UC Riverside researchers find a way to use the infrared region of the sun's spectrum to make solar cells more efficient July 27th, 2015

Industrial Nanotech, Inc. Provides Update on PCAOB Audited Financials July 27th, 2015

Ultra-thin hollow nanocages could reduce platinum use in fuel cell electrodes July 24th, 2015

Solar/Photovoltaic

Reshaping the solar spectrum to turn light to electricity: UC Riverside researchers find a way to use the infrared region of the sun's spectrum to make solar cells more efficient July 27th, 2015

Rice University finding could lead to cheap, efficient metal-based solar cells: Plasmonics study suggests how to maximize production of 'hot electrons' July 22nd, 2015

Perovskite solar technology shows quick energy returns: New technology beats current solar panel technology in life-cycle energy assessment July 20th, 2015

Nanowires give 'solar fuel cell' efficiency a tenfold boost: Eindhoven researchers make important step towards a solar cell that generates hydrogen July 17th, 2015

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