Navigation Links
Scientists demonstrate high-efficiency quantum dot solar cells
Date:10/26/2012

Research shows newly developed solar powered cells may soon outperform conventional photovoltaic technology. Scientists from the National Renewable Energy Laboratory (NREL) have demonstrated the first solar cell with external quantum efficiency (EQE) exceeding 100 percent for photons with energies in the solar range. (The EQE is the percentage of photons that get converted into electrons within the device.) The researchers will present their findings at the AVS 59th International Symposium and Exhibition, held Oct. 28 Nov. 2, in Tampa, Fla.

While traditional semiconductors only produce one electron from each photon, nanometer-sized crystalline materials such as quantum dots avoid this restriction and are being developed as promising photovoltaic materials. An increase in the efficiency comes from quantum dots harvesting energy that would otherwise be lost as heat in conventional semiconductors. The amount of heat loss is reduced and the resulting energy is funneled into creating more electrical current.

By harnessing the power of a process called multiple exciton generation (MEG), the researchers were able to show that on average, each blue photon absorbed can generate up to 30 percent more current than conventional technology allows. MEG works by efficiently splitting and using a greater portion of the energy in the higher-energy photons. The researchers demonstrated an EQE value of 114 percent for 3.5 eV photons, proving the feasibility of this concept in a working device.

Joseph Luther, a senior scientist at NREL, believes MEG technology is the right direction. "Since current solar cell technology is still too expensive to completely compete with non-renewable energy sources, this technology employing MEG demonstrates that the way in which scientists and engineers think about converting solar photons to electricity is constantly changing," Luther said. "There may be a chance to dramatically increase the efficiency of a module, w
'/>"/>

Contact: Catherine Meyers
cmeyers@aip.org
301-209-3088
American Institute of Physics
Source:Eurekalert

Page: 1 2

Related biology technology :

1. Scientists defuse the Vietnam time bomb
2. Singapore scientists lead human embryonic stem cell study
3. Sheffield scientists shine a light on the detection of bacterial infection
4. Nanowiggles: Scientists discover graphene nanomaterials with tunable functionality in electronics
5. Scientists solve mystery of colorful armchair nanotubes
6. iBioSeminars and iBioMagazine: Free, Online Biology Seminars and Short Talks by Leading Scientists
7. Chinese Scientists Zhen-Yi Wang and Zhu Chen Awarded 7th Annual Szent-Gyorgyi Prize for Progress in Cancer Research
8. Scientists decode brain waves to eavesdrop on what we hear
9. Receptos Scientists Publish Determination of a High Resolution Sphingosine 1-Phosphate Receptor 1 Structure in Science
10. Scientists learn how to out run damage with imaging technique
11. Design eye for the science guy: Drop-in clinic helps scientists communicate data
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/15/2014)... "The interface is the device," Nobel laureate Herbert ... to be found at the junctures where layers ... of nanotechnology, the interfaces between layers of metal ... such high-tech favorites as spintronics, high-temperature superconductors, ferroelectrics ...
(Date:1/15/2014)... 15, 2014 Cynvenio, a cancer diagnostics ... the genomic analysis of tumor cells in the bloodstream, ... web-based cancer decision support application powered by CollabRx, Inc. ... ClearID™ genomic test, Therapy Finder will provide breast cancer ...
(Date:1/15/2014)... More than 5 million Americans are currently ... seniors will die with Alzheimer’s or another dementia, according ... shocked many Americans into looking for ways to improve ... age-related cognitive disorders. Jonathan Weisman, president of Biohack Pure, ...
(Date:1/15/2014)... Freeslate, Inc ., the leading ... Lupin Limited, one of India’s top five pharmaceutical companies, ... System for high throughput solid form screening. ... a wide range of quality, affordable generic and branded ...
Breaking Biology Technology:A deeper look at interfaces 2Cynvenio Offers New Breast Cancer Therapy Finder Application for its ClearID Breast Cancer Genomic Test 2Cynvenio Offers New Breast Cancer Therapy Finder Application for its ClearID Breast Cancer Genomic Test 3Biohack Pure Offers 5 Tips for Increasing Memory in 2014 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 3
... OMAHA, Neb., April 1, 2011 Transgenomic, ... scientists have completed studies employing the company,s high-sensitivity ... COLD-PCR and BLOCker™-Sequencing.  Results from these studies will ... Research (AACR) meeting in Orlando, Florida, April 2-6, ...
... National Institute of Standards and Technology (NIST) have developed a ... probes used to study nanoscale structures in situ and as ... improve the accuracy of the most precise and delicate nanoscale ... trying to measure the contours of a surface with a ...
... /PRNewswire-Asia-FirstCall/ -- China-Biotics, Inc. (Nasdaq: CHBT ) ... distributor of probiotics products in China, today announced that ... its newly signed U.S. customer. The U.S. ... and formally entered into its agreement with China-Biotics on ...
Cached Biology Technology:Transgenomic, Inc. Presentations to Describe High-Sensitivity Detection of Cancer Biomarkers at the 2011 American Association for Cancer Research Meeting 2Transgenomic, Inc. Presentations to Describe High-Sensitivity Detection of Cancer Biomarkers at the 2011 American Association for Cancer Research Meeting 3Transgenomic, Inc. Presentations to Describe High-Sensitivity Detection of Cancer Biomarkers at the 2011 American Association for Cancer Research Meeting 4Getting the point: Real-time monitoring of atomic-microscope probes adjusts for wear 2China-Biotics Receives First U.S. Sales Order 2China-Biotics Receives First U.S. Sales Order 3
(Date:4/23/2014)... in French and German . ... humans and other mammals, the difference between sexes depends on one ... only in males, where the two sexual chromosomes are X and ... ultimately responsible for all the morphological and physiological differences between males ... A very long time ago, the X and Y were identical, ...
(Date:4/23/2014)... Scarborough research shows that male black widow spiders prefer ... rare example of mate preference by male spiders. ... MacLeod and Maydianne Andrade, a professor in UTSC,s Department ... and the wild that males overwhelmingly chose to mate ... widows can tell whether a potential mate is well-fed ...
(Date:4/23/2014)... (4/23/14) -- Researchers have found evidence of an ... that increase aggressive behavior in children, especially in ... all children exposed to prenatal smoking will have ... not," said Brian Boutwell, Assistant Professor at Sam ... senior author on the study. "One possible ...
Breaking Biology News(10 mins):Male or female? 2Male or female? 3Picky male black widow spiders prefer well-fed virgins 2Genetics risk, prenatal smoking may predict behavioral problems 2
... Clonorchis sinensis affects more than 35 million people ... by this parasite causes clonorchiasis. Repeated or chronic infection can ... bile ducts, including the frequently fatal bile duct cancer - ... C. sinensis , published in BioMed Central,s open access journal ...
... researchers found a way of identifying ideal drug combinations ... occurring. The findings, published in Nature Chemical ... development of new drug combinations to combat severe diseases ... stroke and Alzheimer,s are worsened by inflammation, which is ...
... genetically engineered clotting factor that controlled hemophilia in an ... hemophilia and a broad range of other bleeding problems. ... Xa (FXa), a protein active in blood clotting, and ... bleeding in mouse models of hemophilia. "Our designed variant ...
Cached Biology News:Liver parasite lacks key genes for fatty acid synthesis: Genome sequencing of Clonorchis sinensis 2Manchester's 'first step' to perfect drug combinations 2Bioengineered protein shows preliminary promise as new therapy for hemophilia 2
... a software package that provides crystallographers ... custom buffer creation, set-up of experimental ... trials. The software helps crystallographers through ... protein crystallography: Design ...
The PROTEAN II slab gel casting stand is a component of the PROTEAN II XL and xi casting apparatus. It is supplied with gaskets....
Mouse monoclonal [H4B4] to LAMP2 - Lysosome Marker (Phycoerythrin) ( Abpromise for all tested applications). entrezGeneID: 3920 SwissProtID: P13473...
... imaging software for the microscopy market ... cameras, components and peripherals with powerful ... Its intuitive interface simplifies workflow and ... providing powerful features such as image ...
Biology Products: