Navigation Links
Stanford researchers develop new technology for cheaper, more efficient solar cells
Date:2/20/2011

The amount of energy required is specific to different materials and affects what color, or wavelength, of light the material best absorbs. Silicon is commonly used to make solar cells because the energy required to excite its electrons corresponds closely to the wavelength of visible light.

But solar cells made of a single material have a maximum efficiency of about 31 percent, a limitation of the fixed energy level they can absorb.

Quantum dot solar cells do not share this limitation and can in theory be far more efficient. The energy levels of electrons in quantum dot semiconductors depends on their size the smaller the quantum dot, the larger the energy needed to excite electrons to the next level.

So quantum dots can be tuned to absorb a certain wavelength of light just by changing their size. And they can be used to build more complex solar cells that have more than one size of quantum dot, allowing them to absorb multiple wavelengths of light.

Because of these advantages, Bent and her students have been investigating ways to improve the efficiency of quantum dot solar cells, along with associate Professor Michael McGehee of the department of Materials Science and Engineering.

The researchers coated a titanium dioxide semiconductor in their quantum dot solar cell with a very thin single layer of organic molecules. These molecules were self-assembling, meaning that their interactions caused them to pack together in an ordered way. The quantum dots were present at the interface of this organic layer and the semiconductor. Bent's students tried several different organic molecules in an attempt to learn which ones would most increase the efficiency of the solar cells.

But she found that the exact molecule didn't matter just having a single organic layer less than a nanometer thick was enough to triple the efficiency of the solar cells. "We were surprised, we thought it would be very sensitive to what we put
'/>"/>

Contact: Louis Bergeron
louisb3@stanford.edu
650-725-1944
Stanford University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Circadian clock may be critical for remembering what you learn, Stanford researchers say
2. Stanford researchers: Global warming is killing frogs and salamanders in Yellowstone Park
3. Key link in how plants adapt to climate discovered by Stanford researchers
4. Cell movements totally modular, Stanford study shows
5. Powerful online tool for protein analysis provided pro bono by Stanford geneticist
6. New World post-pandemic reforestation helped start Little Ice Age, say Stanford scientists
7. Stanford launches $100 million initiative to tackle energy issues
8. Biofuels boom could fuel rainforest destruction, Stanford researcher warns
9. From stem cells to new organs: Stanford and NYU scientists cross threshold in regenerative medicine
10. Stanford researchers develop biodegradable substitutes for wood, plastic bottles and other materials
11. Stanford scientists find new solutions for the arsenic-poisoning crisis in Asia
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/18/2014)... their colleagues have built the first smartphone app ... and behavioral trends. In other words, your smartphone ... you don,t -- and how that affects you. ... stress, depression and loneliness to their academic performance, ... for example, to monitor mental health, trigger ...
(Date:9/18/2014)... which have devastated algal forests in the eastern Mediterranean ... basin if their distribution continues to expand as the ... an international team of researchers led by Dr Adriana ... the Mediterranean Institute for Advanced Studies in Spain, is ... of the team surveyed more than 1000 kilometres of ...
(Date:9/18/2014)... Becoming invisible is probably the ultimate form of camouflage: ... you. And this strategy is not as uncommon as ... Maryland Baltimore County, USA, explains that the larval life ... is one part of the anatomy that most creatures ... compound eyes have to shield each individual eye unit ...
Breaking Biology News(10 mins):New Dartmouth smartphone app reveals users' mental health, performance, behavior 2New Dartmouth smartphone app reveals users' mental health, performance, behavior 3New Dartmouth smartphone app reveals users' mental health, performance, behavior 4Tropical fish a threat to Mediterranean Sea ecosystems 2Transparent larvae hide opaque eyes behind reflections 2
... COLUMBUS, Ohio - For the first time, researchers have found ... therapy agent directly into a single living cell without a ... therapeutic biomolecules through a tiny channel and into a cell ... and his colleagues at Ohio State University describe the technique ...
... terrorized its plant-eating neighbours in South America was a lot ... found. Carnotaurus was a seven-metre-long predator with ... student Scott Persons says made it one of the fastest ... tail bones of Carnotaurus showed its caudofemoralis muscle ...
... , New York, NY (October 14, 2011) Researchers at ... uncovered a vast new gene regulatory network in mammalian cells ... The studies appear in today,s online edition of Cell ... a missing piece in the puzzle of cell regulation and ...
Cached Biology News:Researchers do precise gene therapy without a needle 2Researchers do precise gene therapy without a needle 3Vast hidden network regulates gene expression in cancer 2Vast hidden network regulates gene expression in cancer 3
(Date:9/19/2014)... , Sept. 19, 2014 Pfenex Inc. ... the development of high-value and difficult to manufacture proteins ... presenting at the 21 st Annual NewsMakers in ... . Bertrand Liang , chief executive officer ... development programs and business strategy on Friday, September 26, ...
(Date:9/19/2014)... 2014 Cereal grain scientists, quality ... gather October 5–8, 2014, for the AACC International ... Center in Providence, Rhode Island. The comprehensive scientific ... food scientists, chemists, microbiologists, nutritionists, and those interested ... management. To date, 1,000 attendees have registered for ...
(Date:9/19/2014)... 19, 2014 The new , Healthcare ... , available today on PharmaBoardroom.com for free ... that rocked the Spanish economy in 2009, and the austerity ... has remained pragmatic in times of trouble. "Despite ... fifth biggest European market, and the general conditions to invest ...
(Date:9/18/2014)... , Sept. 18, 2014 About POCT ... is performed outside a clinical laboratory. It helps ... administrating appropriate treatments and medication. POCT is gaining ... of lifestyle diseases such as diabetes, heart disease, ... POCT devices are standardized to minimize errors during ...
Breaking Biology Technology:Pfenex to Present at Upcoming Industry Conference on September 26 2Latest Research on Cereal Grain Quality, Health Benefits and Food Production to be Presented During the AACC International Annual Meeting 2Latest Research on Cereal Grain Quality, Health Benefits and Food Production to be Presented During the AACC International Annual Meeting 3PharmaBoardroom Releases New Spain Pharmaceuticals Report 2PharmaBoardroom Releases New Spain Pharmaceuticals Report 3POCT Market in China 2014-2018 2
... 11 /PRNewswire-FirstCall/ - GeneNews Limited (TSX: GEN), a ... the early detection of diseases and personalized health ... a agreement allowing Centocor Research & Development, Inc. ... biomarker program. Additional terms of the agreement were ...
... Hovione announced today,that it has agreed with Pfizer to ... This site manufactures,intermediates for Lipitor active pharmaceutical ingredient. , ... had a number of owners starting in 1984 with ... and now Hovione. Over,the last 10 years Pfizer has ...
... McCulley/Cuppan announced today the launch of a new series of web-based ... The web delivered "short" courses are one hour in duration and ... writing skills. , ... Salt Lake City, Utah (PRWEB) ...
Cached Biology Technology:GeneNews provides Centocor access to its osteoarthritis program 2Hovione Buys Pfizer's Loughbeg API Facility 2Hovione Buys Pfizer's Loughbeg API Facility 3McCulley/Cuppan Announced Today The Launch Of A New Series Of Web-Based Training Programs For Professionals In The Biopharmaceutical And Life Science Industries 2McCulley/Cuppan Announced Today The Launch Of A New Series Of Web-Based Training Programs For Professionals In The Biopharmaceutical And Life Science Industries 3
...
Agarose for baculovirus plaque assays which allow optimal growth of plated insect cells....
BD BaculoGold Max-XP Insect Cell Medium 1 Liter...
Mycoplasma and virus tested...
Biology Products: