Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Record-breaking solar cell announced by multinational research team

Left: Quantum dots capped with organic ligands. Bulky organic molecules (yellow and blue) has led to lower performance. Right: Quantum dots capped with the novel inorganic ligands reported in the work. Reduce bulk helped get electrons out, leading to record performance.
Left: Quantum dots capped with organic ligands. Bulky organic molecules (yellow and blue) has led to lower performance. Right: Quantum dots capped with the novel inorganic ligands reported in the work. Reduce bulk helped get electrons out, leading to record performance.
Left: Quantum dots capped with organic ligands. Bulky organic molecules (yellow and blue) has led to lower performance. Right: Quantum dots capped with the novel inorganic ligands reported in the work. Reduce bulk helped get electrons out, leading to record performance. Left: Quantum dots capped with organic ligands. Bulky organic molecules (yellow and blue) has led to lower performance. Right: Quantum dots capped with the novel inorganic ligands reported in the work. Reduce bulk helped get electrons out, leading to record performance.

Abstract:
The most efficient colloidal-quantum-dot solar cell ever created will be described in a scientific paper to be published in a print edition of the journal Nature Materials by a team of scientists that includes John Asbury, assistant professor of chemistry at Penn State. Other members of the research team are at the University of Toronto (U of T) in Canada and the King Abdullah University of Science & Technology (KAUST) in Saudi Arabia.

Record-breaking solar cell announced by multinational research team

University Park, PA | Posted on September 22nd, 2011

"We figured out how to shrink the wrappers that encapsulate quantum dots down to the smallest imaginable size -- a mere layer of atoms," said Professor Ted Sargent at U of T, the corresponding author on the work and the holder of the Canada Research Chair in Nanotechnology. Quantum dots are nanoscale semiconductors that capture light and convert it into electrical energy. Because of their small size, the dots can be sprayed onto flexible surfaces, including plastics, enabling the production of solar cells that are less expensive than the existing silicon-based version.

But a crucial challenge for the field has been improving their efficiency. The ideal design for greatest efficiency is one that tightly packs the quantum dots together. Until now, quantum dots have been capped with organic molecules that separate the nanoparticles by a nanometer -- making them too bulky for optimum efficiency. To solve the problem, the research team turned to inorganic ligands, sub-nanometer-sized atoms that bind to the quantum dot surfaces and take up less space.

"The inorganic ligands form the smallest possible shell that can be wrapped around quantum dots," Asbury explains. "It is the thinness of the shell that allows the quantum dots to pack so closely that electrons can flow smoothly through the material to make photocurrent."

The colloidal quantum dots examined by Asbury and his team members yielded the highest electrical currents, and the highest overall power-conversion efficiency, ever seen in colloidal quantum dot (CQD) solar cells. These performance results were certified by an external laboratory, Newport, that is accredited by the U.S. National Renewable Energy Laboratory.

"Extensive testing has confirmed that we were able to remove charge traps -- locations where electrons get stuck -- while still packing the quantum dots closely together," Asbury said. The combination of close packing and charge-trap elimination enabled unprecedented levels of photocurrent to flow through the solar cells, thus providing record efficiency.

A technology licensing agreement has been signed by U of T and KAUST, brokered by MaRS Innovations (MI), which will enable the global commercialization of this new technology. "Through U of T's, MI's, and KAUST's partnership, we are poised to translate exciting research into tangible innovations that can be commercialized," said Sargent. "The world -- and the marketplace -- need solar innovations that break the existing compromise between performance and cost.

This research was supported by King Abdullah University of Science and Technology, the Petroleum Research Fund, the National Science Foundation, and the U. S. Office of Naval Research.

####

For more information, please click here

Contacts:
Barbara Kennedy
814-863-4682


John Asburyh
814-863-6309

Copyright © Penn State

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

News and information

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

Production of Biocompatible Polymers in Iran October 30th, 2014

Amorphous Coordination Polymer Particles as alternative to classical nanoplatforms for nanomedicine October 30th, 2014

Govt.-Legislation/Regulation/Funding/Policy

'Electronic skin' could improve early breast cancer detection October 29th, 2014

New solar power material converts 90 percent of captured light into heat: SunShot Project aims to make solar cost competitive October 29th, 2014

Tiny carbon nanotube pores make big impact October 29th, 2014

Microrockets fueled by water neutralize chemical and biological warfare agents October 29th, 2014

Discoveries

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

Production of Biocompatible Polymers in Iran October 30th, 2014

Amorphous Coordination Polymer Particles as alternative to classical nanoplatforms for nanomedicine October 30th, 2014

Announcements

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

Production of Biocompatible Polymers in Iran October 30th, 2014

Amorphous Coordination Polymer Particles as alternative to classical nanoplatforms for nanomedicine October 30th, 2014

Military

Microrockets fueled by water neutralize chemical and biological warfare agents October 29th, 2014

Breakthrough in molecular electronics paves the way for DNA-based computer circuits in the future: DNA-based programmable circuits could be more sophisticated, cheaper and simpler to make October 27th, 2014

NanoTechnology for Defense (NT4D) October 22nd, 2014

Imaging electric charge propagating along microbial nanowires October 20th, 2014

Energy

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

New solar power material converts 90 percent of captured light into heat: SunShot Project aims to make solar cost competitive October 29th, 2014

New Compact SIMS at 61st AVS | Visit us on Booth 311 October 28th, 2014

New evidence for an exotic, predicted superconducting state October 27th, 2014

Quantum Dots/Rods

Journal Nanotechnology Progress International (JONPI), 2014, Volume 5, Issue 1, pp 1-24 October 22nd, 2014

QD Vision Wins Prestigious Presidential Green Chemistry Challenge Award from the U.S. Environmental Protection Agency October 16th, 2014

Ultrafast remote switching of light emission October 2nd, 2014

Platinum meets its match in quantum dots from coal: Rice University's cheap hybrid outperforms rare metal as fuel-cell catalyst October 1st, 2014

Research partnerships

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Sussex physicists find simple solution for quantum technology challenge October 28th, 2014

Molecular beacons shine light on how cells 'crawl' October 27th, 2014

New evidence for an exotic, predicted superconducting state October 27th, 2014

Solar/Photovoltaic

New solar power material converts 90 percent of captured light into heat: SunShot Project aims to make solar cost competitive October 29th, 2014

Advancing thin film research with nanostructured AZO: Innovnano’s unique and cost-effective AZO sputtering targets for the production of transparent conducting oxides October 23rd, 2014

Magnetic mirrors enable new technologies by reflecting light in uncanny ways October 16th, 2014

Dyesol Signs Letter of Intent with Tata Steel October 13th, 2014

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 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE