Nanotechnology Now







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

Haydale Announce Dedicated Graphene Inks Manufacturing Capability March 25th, 2015

Caltech scientists develop cool process to make better graphene March 18th, 2015

Engineers create chameleon-like artificial 'skin' that shifts color on demand March 12th, 2015

Breakthrough in OLED technology March 2nd, 2015

Chip Technology

State-of-the-art online system unveiled to pinpoint metrology software accuracy March 27th, 2015

SUNY POLY CNSE to Host First Ever Northeast Semi Supply Conference (NESCO) Conference Will Connect New and Emerging Innovators in the Northeastern US and Canada with Industry Leaders and Strategic Investors to Discuss Future Growth Opportunities in NYS March 25th, 2015

NXP and GLOBALFOUNDRIES Announce Production of 40nm Embedded Non-Volatile Memory Technology: Co-developed technology to leverage GLOBALFOUNDRIES 40nm process technology platform March 24th, 2015

Building shape inspires new material discovery March 24th, 2015

Discoveries

Chemists make new silicon-based nanomaterials March 27th, 2015

UT Dallas engineers twist nanofibers to create structures tougher than bulletproof vests March 27th, 2015

Novel nanoparticle therapy promotes wound healing March 27th, 2015

Designer's toolkit for dynamic DNA nanomachines: Arm-waving nanorobot signals new flexibility in DNA origami March 27th, 2015

Announcements

UT Dallas engineers twist nanofibers to create structures tougher than bulletproof vests March 27th, 2015

Novel nanoparticle therapy promotes wound healing March 27th, 2015

Designer's toolkit for dynamic DNA nanomachines: Arm-waving nanorobot signals new flexibility in DNA origami March 27th, 2015

Using magnetic fields to understand high-temperature superconductivity: Los Alamos explores experimental path to potential 'next theory of superconductivity' March 27th, 2015

Energy

LAMDAMAP 2015 hosted by the University March 26th, 2015

SUNY Poly & M+W Make Major Announcement: Major Expansion To Include M+W Owned Gehrlicher Solar America Corporation That Will Create up to 400 Jobs to Develop Solar Power Plants at SUNY Poly Sites Across New York State March 26th, 2015

Hong Kong Investors Bullish on Dais Analytic Invest $5.75M, Provide $60M Contract, and Create New Joint Venture Company March 26th, 2015

Industrial Nanotech, Inc. Announces Next Large Order from the Oil and Gas Industry March 26th, 2015

Solar/Photovoltaic

LAMDAMAP 2015 hosted by the University March 26th, 2015

SUNY Poly & M+W Make Major Announcement: Major Expansion To Include M+W Owned Gehrlicher Solar America Corporation That Will Create up to 400 Jobs to Develop Solar Power Plants at SUNY Poly Sites Across New York State March 26th, 2015

New kind of 'tandem' solar cell developed: Researchers combine 2 types of photovoltaic material to make a cell that harnesses more sunlight March 24th, 2015

Caltech scientists develop cool process to make better graphene March 18th, 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







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE