Navigation Links
Bottoms up: Better organic semiconductors for printable electronics
Date:9/5/2008

Researchers from the National Institute of Standards and Technology (NIST) and Seoul National University (SNU) have learned how to tweak a new class of polymer-based semiconductors to better control the location and alignment of the components of the blend. Their recent resultshow to move the top to the bottomcould enable the design of practical, large-scale manufacturing techniques for a wide range of printable, flexible electronic displays and other devices.*

Organic semiconductorsnovel carbon-based molecules that have similar electrical properties to more conventional semiconducting materials like silicon and germaniumare a hot research topic because practical, high-performance organic semiconductors would open up whole new categories of futuristic electronic devices. Think of tabloid-sized digital paper that you could fold up into your pocket or huge sheets of photovoltaic cells that are dirt cheap because theyre manufactured bybasicallyink-jet printing.

The problem is performance. Small organic molecules have been developed with key electrical parameters close to the benchmark set by amorphous silicon semiconductors, but they are very difficult to deposit in a stable, uniform filma key manufacturing requirement. Larger molecule polymer semiconductors, on the other hand, make excellent thin films but have at best limited semiconductor properties. A patent from British researchers in 2005 offered a promising compromise: blend the small semiconductor molecules in with the polymer. This works surprisingly well, but with an asterisk. Tests showed that actual devices, field effect transistors, made with the blend only worked well in a so-called top-gated structure. The critical active part of the film was on the top, and the switching part of the device (the gate) had to be layered on top of that, a process difficult or impossible to do on a large scale without destroying the fragile film.

Working at NISTs Center for Neutron Research, the SNU/NIST research team used a neutron imaging technique that allowed them to observe, with nanometer resolution, how the distribution of small organic semiconductor molecules embedded in polymer films changed with depththe films are less than 100 nanometers thick. In the thin films originally described by the patent, the bulk of the semiconductor molecules end up at the top of the film, as suspected. However, when the SNU/NIST research team substituted a polymer with significantly higher molecular mass, something interesting happened. The organic semiconductor small molecules distributed themselves evenly at the top and bottom of the film. Having an active region of the film on the bottom is key for large-scale manufacturing because it means the rest of the devicegate, source, draincan be laid down first and the delicate film layer added last.

In addition, they report, the optimized blend of polymer and organic semiconductor actually has better performance characteristics than the organic semiconductor on its own.


'/>"/>

Contact: Michael Baum
michael.baum@nist.gov
301-975-2763
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Related biology technology :

1. Understanding the science of solar-based energy: more researchers are better than one
2. Tips on how to build a better home for biological parts
3. Naviscans PEM Flex(TM) Detects Smallest Cancers Better Compared to MRI in an Independent Study
4. Video: Higher Initial Dose of Gleevec Achieved Better Early Responses than Standard Dose for Patients with Chronic Myeloid Leukemia
5. Better business decisions with real-time data
6. Better Nutrition Launches 2008 Summer Nutrition Tour
7. 2 types of image are better than 1 for analyzing tumors
8. Research Confirms Better Oil from New DuPont High Oleic Soybean Trait
9. BASF Podcast - Better Harvest in Spite of Climate Stress
10. ChemAxon Launches Marvin and JChem Version 5: Better User Experience, Better Integration, More Flexibility and Higher Performance
11. DOE JGI plumbs termite guts to yield novel enzymes for better biofuel production
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Bottoms up: Better organic semiconductors for printable electronics
(Date:2/11/2016)... Biosciences, Inc. (NASDAQ: NBIX ) today announced its financial results ... --> --> For the fourth quarter ... or $0.34 loss per share, compared to a net loss of ... in 2014. For the year ended December 31, 2015, the Company ... share, as compared to a net loss of $60.5 million, or ...
(Date:2/11/2016)... and GERMANTOWN, Maryland , ... Frankfurt Prime Standard: QIA) today announced the introduction of ... gene expression profiling, expanding QIAGEN,s portfolio of Sample to ... researchers to select from over 20,000 human genes and ... between genes, cellular phenotypes and disease processes. --> ...
(Date:2/11/2016)... Feb. 11, 2016  Spectra BioPharma Selling Solutions (Spectra) ... provides biopharma companies the experience, expertise, operational delivery ... outsourced sales teams. Created in concert with industry ... the strategic and tactical needs of its clients ... through both personal and non-personal promotion. ...
(Date:2/11/2016)... ... February 11, 2016 , ... ... to delivering cutting-edge information focused on the development and manufacture of biopharmaceuticals ... a premier sponsor of the 2016 BioProcess International Awards – Recognizing Excellence ...
Breaking Biology Technology:
(Date:1/20/2016)... LONDON , Jan. 20, 2016 A ... positioned to directly benefit from the explosion in genomics ... from Howe Sound Research. A range of dynamic trends ... ...... - personalized medicine - pharmacogenomics - pathogen ... economies with large markets - greater understanding of the ...
(Date:1/15/2016)... Jan. 15, 2016 Recent publicized breaches in ... find new ways to ensure data security and user ... and Android that ties a user,s ... it into a hardware authorization token. Customer service agents ... fingerprint on their KodeKey enabled device to verify their ...
(Date:1/11/2016)... Jan. 11, 2016  higi, the leading retail ... retail locations, web and mobile, today announced it ... from existing investors. --> ... to further innovate higi,s health platform – its ... portal – including expanding services and programs to ...
Breaking Biology News(10 mins):