Navigation Links
NREL reports 31.1 percent efficiency for III-V solar cell
Date:6/25/2013

teiner, John Geisz, Ivn Garca and the III-V multijunction PV group have implemented new approaches providing a substantial improvement over NREL's previous results."

"Historically, scientists have bumped up the performance of multijunction cells by gradually improving the material quality and the internal electrical properties of the junctions -- and by optimizing variables such as the bandgaps and the layer thicknesses," NREL Scientist Myles Steiner said. But internal optics plays an underappreciated role in high-quality cells that use materials from the third and fifth columns of the periodic tables the III-V cells. "The scientific goal of this project is to understand and harness the internal optics," he said.

When an electron-hole pair recombines, a photon can be produced, and if that photon escapes the cell, luminescence is observed that is the mechanism by which light-emitting diodes work. In traditional single-junction gallium-arsenide cells, however, most of the photons are simply absorbed in the cell's substrate and are lost. With a more optimal cell design, the photons can be re-absorbed within the solar cell to create new electron-hole pairs, leading to an increase in voltage and conversion efficiency. In a multijunction cell, the photons can also couple to a lower bandgap junction, generating additional current, a process known as luminescent coupling.

The NREL researchers improved the cell's efficiency by enhancing the photon recycling in the lower, gallium-arsenide junction by using a gold back contact to reflect photons back into the cell, and by allowing a significant fraction of the luminescence from the upper, GaInP junction to couple into the GaAs junction. Both the open-circuit voltage and the short-circuit current were increased.

Silicon solar cells now dominate the world PV market, but researchers see opportunities for new materials. High-efficiency concentrator cells bolstered by lenses that magnify the po
'/>"/>

Contact: David Glickson
david.glickson@nrel.gov
303-275-4097
DOE/National Renewable Energy Laboratory
Source:Eurekalert

Page: 1 2 3

Related biology technology :

1. China Cord Blood Corporation Reports Financial Results for the Fourth Quarter and Full Year of Fiscal 2013
2. DNA Sequencing Market 2013 Developments & 2016 Product Forecasts in New Research Reports at ReportsnReports.com
3. Z Trim Holdings Reports Continued Sales Growth in May 2013
4. GW Pharmaceuticals plc Reports 2013 Second Quarter Financial Results
5. CTI Reports Final Results from Cooperative Group and NCI-Sponsored Trial of Brostallicin in Patients with Metastatic Triple-Negative Breast Cancer
6. Kinase Market Profiling - In House & Outsourced Trends 2015 Forecast in New Research Report at ReportsnReports.com
7. Insero Health Reports Positive Data on Phase I Trial of Novel Therapy for Drug-resistant Epilepsy
8. Vermillion Reports First Quarter 2013 Results
9. Dyadic International Reports First Quarter 2013 Financial Results
10. Neuralstem Reports First Quarter Financial Results And Provides Business And Clinical Update
11. Inovio Pharmaceuticals Reports 2013 First Quarter Financial Results
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/29/2014)... , July 29, 2014 Human Longevity, ... therapeutic company focused on extending the healthy, high performance ... Franz Och , Ph.D., an expert in machine learning ... Och comes to HLI from Google where he was ... He will report directly to HLI Co-Founder and CEO, ...
(Date:7/29/2014)... (July 29, 2014) Tough, ultralight foam of ... shape through a chemical process invented at Rice University. ... looks like a nanoscale building, with floors and walls ... pair of two-dimensional materials: floors and walls of graphene ... nitride platelets. , The researchers say the foam ...
(Date:7/29/2014)... , July 29, 2014  The Society ... new and updated program for the 9 th ... 12, 2014 in Amelia Island , Florida.  ... and investigators remains unchanged, however, the topics and ... and networking opportunity among all stakeholders with a ...
(Date:7/29/2014)... Second generation biofuels are a viable solution to the dilemma ... gas is very cheap, this is affecting the biofuels market ... they could be in comparison to natural gas. This, ... difficult for renewable energy developers to get the economics to ... reasons, certain companies have shifted their focused within renewable energy. ...
Breaking Biology Technology:Franz Och, Ph.D., Expert in Machine Learning and Machine Translation, Joins Human Longevity, Inc. as Chief Data Scientist 2Franz Och, Ph.D., Expert in Machine Learning and Machine Translation, Joins Human Longevity, Inc. as Chief Data Scientist 3Tough foam from tiny sheets 2TransCelerate, Lilly, Pfizer, and FDA Highlight Collaborative Program at the Site Solutions Summit 2TransCelerate, Lilly, Pfizer, and FDA Highlight Collaborative Program at the Site Solutions Summit 3Renewable Waste Intelligence: Could Renewable Chemicals Be the Future for the Renewable Energy Industry? 2
... NORWOOD, Mass., Aug. 24 Advanced Instruments has introduced a ... experience when purchasing osmometers, cryoscopes, and microbiological laboratory instruments. The ... es.com , was developed from the perspective of ... application information, scientific materials, and technical support. , , ...
... SAN DIEGO, Aug. 24 Orexigen((R)) Therapeutics, Inc. (Nasdaq: ... joined the Company as Chief Commercial Officer. Mr. Booth ... to Orexigen. Most recently he served as President of ... commercial, medical and scientific affairs, business development and all support ...
... August 24 Foamix Ltd., a leading,developer of topical ... been awarded US Patent #7575739 pertaining to its foam,technology. ... of heat and chemical burns, wounds, bacterial, fungal and ... the Company,s CEO stated, "The novelty of our foam,technology ...
Cached Biology Technology:Advanced Instruments Introduces Next-Generation Web Site 2Orexigen(R) Therapeutics Appoints Mark Booth Chief Commercial Officer 2Foamix Receives US Patent on Novel Foam Technology 2
(Date:7/29/2014)... have been plaguing the Northern Territories in Canada and ... in the U.S. continue on. NASA,s Aqua satellite ... Spectroradiometer, MODIS, instrument on July 26, 2014. Actively burning ... red. Copious amount of smoke are drifting northward in ... residents of Yellowknife. Fire has caused power outages ...
(Date:7/29/2014)... easier method to create DNAprotein conjugates. The method ... diseases. , DNA linked to proteins including ... be used in diagnostic techniques, nanotechnology and other ... DNA can be used for purposes such ... material. The method also provides easier access to ...
(Date:7/29/2014)... from scientists at the University of Kent has shown ... are regulated a breakthrough that could have a ... from Kent,s School of Biosciences uncovered the mechanism whereby ... known as actin filaments are ,fine-tuned, to ... filaments appear to completely stable, providing a framework for ...
Breaking Biology News(10 mins):New method provides researchers with efficient tool for tagging proteins 2
... This press release is available in French . ... people are not slower but rather wiser than young brains, ... performance, according research undertaken at the University Geriatrics Institute of ... the Univeristy of Montreal. "The older brain has experience and ...
... Society of Interventional Radiology Foundation,s Discovery Campaign, which ... medicine into new areas of discovery, announced a ... manufacturer of medical devices, pharmaceuticals and medical supplies, ... is a "Visionary" level supporter. "Collaboration ...
... one way that old-fashioned newsprint beats the Internet. Tulane ... "TU-103," that can use paper to produce butanol, a ... They are currently experimenting with old editions of the ... success., ,TU-103 is the first bacterial strain from nature ...
Cached Biology News:Clinical study shows young brains lack the wisdom of their elders 2Cars could run on recycled newspaper, Tulane scientists say 2
...
... Fully adjustable mixing angle, Variable speed, Digital ... a number of different sized tubes, Spillage ... cultures, keeping biological samples in suspension and ... be used in incubators up to 60C ...
... The DNA Engine Opticon 2 real-time PCR ... LEDs for fluorescence excitation (470-505 nm) and ... nm, 540-700 nm). The Opticon 2 system ... cycler, which includes a thermal gradient feature. ...
... Multicolor capability allows detection of SYBR ... channel, and a range of fluorophores in ... VIC, and TAMRA for a multitude ... discrimination. DNA Engine thermal cycler offers precision ...
Biology Products: