Nanostructure of organic solar cell materials revealed
Using a soft X-ray microscope, a Japanese research team has examined the nanostructure of organic solar cells and discovered that different molecules are intermixed in each molecular domain.
This discovery is expected to reveal the energy conversion mechanism in organic solar cells and thereby facilitate the establishment of guidelines to design high efficiency organic solar cells.
Bulk heterojunction organic solar cells are characterized by their high energy conversion efficiency. In order to improve the efficiency of cells, it had been thought to be important up until now to have a clean interface between a polymer material and a single molecular domain of a fullerene.
However, when the researchers carefully examined the domain structure of cell materials that were optimized for energy conversion efficiency using a new methodology involving a soft X-ray microscope, they found that different molecules were intermixed in each molecular domain.
In other words, they found that cells with a “dirty” interface have superior performance to those with a “clean” interface. This new discovery defies the common understanding of the energy conversion mechanism.
These results were published on April 16, 2014 in the online version of Applied Physics Express, a journal issued by the Japan Society of Applied Physics.
Mikiko Tanifuji | Research SEA News
Twisting magnets enhance data storage capacity
12.02.2016 | Hiroshima University
A metal that behaves like water
12.02.2016 | Harvard John A. Paulson School of Engineering and Applied Sciences
Today, plants and microorganisms are heavily used for the production of medicinal products. The production of biopharmaceuticals in plants, also referred to as “Molecular Pharming”, represents a continuously growing field of plant biotechnology. Preferred host organisms include yeast and crop plants, such as maize and potato – plants with high demands. With the help of a special algal strain, the research team of Prof. Ralph Bock at the Max Planck Institute of Molecular Plant Physiology in Potsdam strives to develop a more efficient and resource-saving system for the production of medicines and vaccines. They tested its practicality by synthesizing a component of a potential AIDS vaccine.
The use of plants and microorganisms to produce pharmaceuticals is nothing new. In 1982, bacteria were genetically modified to produce human insulin, a drug...
Atomic clock experts from the Physikalisch-Technische Bundesanstalt (PTB) are the first research group in the world to have built an optical single-ion clock which attains an accuracy which had only been predicted theoretically so far. Their optical ytterbium clock achieved a relative systematic measurement uncertainty of 3 E-18. The results have been published in the current issue of the scientific journal "Physical Review Letters".
Atomic clock experts from the Physikalisch-Technische Bundesanstalt (PTB) are the first research group in the world to have built an optical single-ion clock...
The University of Würzburg has two new space projects in the pipeline which are concerned with the observation of planets and autonomous fault correction aboard satellites. The German Federal Ministry of Economic Affairs and Energy funds the projects with around 1.6 million euros.
Detecting tornadoes that sweep across Mars. Discovering meteors that fall to Earth. Investigating strange lightning that flashes from Earth's atmosphere into...
Physicists from Saarland University and the ESPCI in Paris have shown how liquids on solid surfaces can be made to slide over the surface a bit like a bobsleigh on ice. The key is to apply a coating at the boundary between the liquid and the surface that induces the liquid to slip. This results in an increase in the average flow velocity of the liquid and its throughput. This was demonstrated by studying the behaviour of droplets on surfaces with different coatings as they evolved into the equilibrium state. The results could prove useful in optimizing industrial processes, such as the extrusion of plastics.
The study has been published in the respected academic journal PNAS (Proceedings of the National Academy of Sciences of the United States of America).
Exceeding critical temperature limits in the Southern Ocean may cause the collapse of ice sheets and a sharp rise in sea levels
A future warming of the Southern Ocean caused by rising greenhouse gas concentrations in the atmosphere may severely disrupt the stability of the West...
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12.02.2016 | Medical Engineering