Navigation Links
U of T researchers crack full-spectrum solar challenge
Date:6/26/2011

In a paper published in Nature Photonics, U of T Engineering researchers report a new solar cell that may pave the way to inexpensive coatings that efficiently convert the sun's rays to electricity.

The U of T researchers, led by Professor Ted Sargent, report the first efficient tandem solar cell based on colloidal quantum dots (CQD). "The U of T device is a stack of two light-absorbing layers one tuned to capture the sun's visible rays, the other engineered to harvest the half of the sun's power that lies in the infrared," said lead author Dr. Xihua Wang.

"We needed a breakthrough in architecting the interface between the visible and infrared junction," said Sargent, a Professor of Electrical and Computer Engineering at the University of Toronto, who is also the Canada Research Chair in Nanotechnology. "The team engineered a cascade really a waterfall of nanometers-thick materials to shuttle electrons between the visible and infrared layers."

According to doctoral student Ghada Koleilat, "We needed a new strategy which we call the Graded Recombination Layer so that our visible and infrared light-harvesters could be linked together efficiently, without any compromise to either layer."

The team pioneered solar cells made using CQD, nanoscale materials that can readily be tuned to respond to specific wavelengths of the visible and invisible spectrum. By capturing such a broad range of light waves wider than normal solar cells tandem CQD solar cells can in principle reach up to 42 per cent efficiencies. The best single-junction solar cells are constrained to a maximum of 31 per cent efficiency. In reality, solar cells that are on the roofs of houses and in consumer products have 14 to 18 per cent efficiency. The work expands the Toronto team's world-leading 5.6 per cent efficient colloidal quantum dot solar cells.

"Building efficient, cost-effective solar cells is a grand global challenge. The University of Toronto is extremely proud of its world-class leadership in the field," said Professor Farid Najm, Chair of The Edward S. Rogers Sr. Department of Electrical & Computer Engineering.

Sargent is hopeful that in five years solar cells using the graded recombination layer published in today's Nature Photonics paper will be integrated into building materials, mobile devices, and automobile parts.

"The solar community and the world needs a solar cell that is over 10% efficient, and that dramatically improves on today's photovoltaic module price points," said Sargent. "This advance lights up a practical path to engineering high-efficiency solar cells that make the best use of the diverse photons making up the sun's broad palette."


'/>"/>

Contact: Takara Small
takara@ecf.utoronto.ca
416-946-7257
University of Toronto Faculty of Applied Science & Engineering
Source:Eurekalert

Related biology news :

1. Orca ears inspire Stanford researchers to develop ultrasensitive undersea microphone
2. Finding is a feather in the cap for researchers studying birds big, powerful eyes
3. Researchers suggest new way of looking at what causes sepsis
4. ORNL researchers win 7 R&D 100 awards
5. Yale researchers pinpoint reasons for dramatic rise in cesarean births
6. U of M researchers find smart decisions for changing environmental times
7. Researchers find process of cervical ripening differs between term and preterm birth
8. Rensselaer researchers secure $2.7 million NIH grant to advance scarless surgery
9. USC researchers find new clues about protein linked to Parkinsons disease
10. GW researchers receive award from NCI to study cancer from a neglected tropical disease
11. MSU plant scientist named one of the nations most innovative researchers
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/4/2017)... of attendees at this year,s International Consumer Electronics Show (CES), A&D ... and services, will be featuring its new line of ULTRA CONNECT ... CES Exhibit Suite , the new upper arm and wrist smart blood ... product platform.  Continue Reading ... ...
(Date:12/20/2016)... , Dec. 20, 2016 The ... sharing, rental and leasing is stoking significant interest ... radio frequency technology, Bluetooth low energy (BLE), biometrics ... as the next wave of wireless technologies in ... access system to advanced access systems opens the ...
(Date:12/16/2016)... The global wearable medical device market, in terms of ... USD 5.31 billion in 2016, at a CAGR of 18.0% during ... ... in medical devices, launch of a growing number of smartphone-based healthcare ... healthcare providers, and increasing focus on physical fitness. ...
Breaking Biology News(10 mins):
(Date:1/13/2017)... ... 13, 2017 , ... FireflySci, in response to several customers’ ... solutions for measurements where traditional cuvette applications are not convenient. For instance, a ... sample that would not fit into a typical cuvette inside a spectrophotometer. In ...
(Date:1/12/2017)... ... January 12, 2017 , ... ... of performing routine electrochemical biosensing has increased dramatically. Primarily driven by the ... and quantification of various analytes in complex samples. , Screen-printed ...
(Date:1/12/2017)... , January 12, 2017 ... the world,s biggest facility for producing mycorrhizae. The Centre ... nutrient tapping potential of mycorrhizae and developed a technology ... ... http://mma.prnewswire.com/media/456932/PRNE_TERI_Logo.jpg) The TERI facility has ...
(Date:1/12/2017)... report "Direct-Fed Microbials Market by Type (Lactic Acid Bacteria and Bacillus), Livestock (Pork/Swine, Poultry, Ruminant, ... 2022", published by MarketsandMarkets, the global market is estimated to be valued at ... 2022, at a CAGR of 6.96% from 2016. ... ... ...
Breaking Biology Technology: