Navigation Links
Ancient diatoms lead to new technology for solar energy
Date:4/8/2009

CORVALLIS, Ore. Engineers at Oregon State University have discovered a way to use an ancient life form to create one of the newest technologies for solar energy, in systems that may be surprisingly simple to build compared to existing silicon-based solar cells.

The secret: diatoms.

These tiny, single-celled marine life forms have existed for at least 100 million years and are the basis for much of the life in the oceans, but they also have rigid shells that can be used to create order in a natural way at the extraordinarily small level of nanotechnology.

By using biology instead of conventional semiconductor manufacturing approaches, researchers at OSU and Portland State University have created a new way to make "dye-sensitized" solar cells, in which photons bounce around like they were in a pinball machine, striking these dyes and producing electricity. This technology may be slightly more expensive than some existing approaches to make dye-sensitized solar cells, but can potentially triple the electrical output.

"Most existing solar cell technology is based on silicon and is nearing the limits of what we may be able to accomplish with that," said Greg Rorrer, an OSU professor of chemical engineering. "There's an enormous opportunity to develop different types of solar energy technology, and it's likely that several forms will ultimately all find uses, depending on the situation."

Dye-sensitized technology, for instance, uses environmentally benign materials and works well in lower light conditions. And the new findings offer advances in manufacturing simplicity and efficiency.

"Dye-sensitized solar cells already exist," Rorrer said. "What's different in our approach are the steps we take to make these devices, and the potential improvements they offer."

The new system is based on living diatoms, which are extremely small, single-celled algae, which already have shells with the nanostructure that is needed. They are allowed to settle on a transparent conductive glass surface, and then the living organic material is removed, leaving behind the tiny skeletons of the diatoms to form a template.

A biological agent is then used to precipitate soluble titanium into very tiny "nanoparticles" of titanium dioxide, creating a thin film that acts as the semiconductor for the dye-sensitized solar cell device. Steps that had been difficult to accomplish with conventional methods have been made easy through the use of these natural biological systems, using simple and inexpensive materials.

"Conventional thin-film, photo-synthesizing dyes also take photons from sunlight and transfer it to titanium dioxide, creating electricity," Rorrer said. "But in this system the photons bounce around more inside the pores of the diatom shell, making it more efficient."

The physics of this process, Rorrer said, are not fully understood but it clearly works. More so than materials in a simple flat layer, the tiny holes in diatom shells appear to increase the interaction between photons and the dye to promote the conversion of light to electricity, and improve energy production in the process.

The insertion of nanoscale tinanium oxide layers into the diatom shell has been reported in ACS Nano, a publication of the American Chemical Society, and the Journal of Materials Research, a publication of the Materials Research Society. The integration of this material into a dye-sensitized solar cell device was also recently described at the fourth annual Greener Nanoscience Conference.


'/>"/>

Contact: Greg Rorrer
rorrergl@engr.oregonstate.edu
541-737-3370
Oregon State University
Source:Eurekalert

Related biology news :

1. Scientists retrace evolution with first atomic structure of an ancient protein
2. CU-Boulder team discovers first ancient manioc fields in Americas
3. Ancient organisms discovered in Canadian gold mine
4. Amber specimen captures ancient chemical battle
5. Ancient whale fall from Californias Año Nuevo Island one of youngest, most complete known
6. Ancient whale fall from Californias Ao Nuevo Island one of youngest, most complete known
7. 454 Sequencing: Science paper describes a novel, highly efficient method of sequencing ancient DNA
8. Newfound ancient African megadroughts may have driven the evolution of humans and fishes
9. Ancient amphibians left full-body imprints
10. Scientists melt million-year-old ice in search of ancient microbes
11. Ancient fish bones reveal impacts of global warming beneath the sea
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/3/2016)... DE SOTO, Kansas , March 3, ... Plus® to offer Oncimmune,s Early CDT®-Lung, a blood ... detection of lung cancer Early CDT®-Lung test ... individuals. --> Early CDT®-Lung test to its ... --> Oncimmune, a leader in early cancer detection, ...
(Date:3/2/2016)... 2016 http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ) ... "Global Biometrics as a Service Market 2016-2020" ... --> http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ) has announced the ... a Service Market 2016-2020" report to ... and Markets ( http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ) has announced ...
(Date:3/1/2016)... March 1, 2016  (RSAC Booth #3041) – True ... whopping $118 billion is lost to false positives, where ... inaccurate fraud detection. At the RSA Conference 2016, NuData ... companies handle authentication by devaluing the data fraudsters have ... --> --> ...
Breaking Biology News(10 mins):
(Date:4/28/2016)... The report "Cryocooler Market by ... (Technical Support, Product Repairs & Refurbishment, Preventive Maintenance, and ... 2022", published by MarketsandMarkets, the global market is expected ... a CAGR of 7.29% between 2016 and 2022. ... Figures spread through 159 Pages and in-depth TOC on ...
(Date:4/28/2016)... ... April 28, 2016 , ... ... Connecticut's innovative, growing companies, today announced the launch of VentureClash , a ... companies. , “VentureClash looks to attract the best early-stage companies here ...
(Date:4/28/2016)... ... 28, 2016 , ... As part of an ongoing global ... expanding its LATAM network and logistics capabilities. Enhancements have been made to ... trial projects. , The expansion will provide unmatched clinical trial logistics services for ...
(Date:4/27/2016)... ... ... Cambridge Semantics, the leading provider of Smart Data analytic and ... named to The Silicon Review’s “20 Fastest Growing Big Data Companies of 2016.” ... needs of end users facing some of the most complex data challenges in the ...
Breaking Biology Technology: