Jul 14, 2016 | 12:00 / Interesting information
A team of researchers from the Moscow State University named M.VLomonosov, in collaboration with German colleagues from the Institute of Polymer Research in Dresden (Leibniz Institute) could find molecule that, in their opinion its can give impetus to the development of organic electronics.
Scientists discovered that a molecule entitled  -radial known to science for nearly 30 years can be used to create organic semiconductors. It is a so-called dopant (a dopant) whose addition to the polymer based substantially increases its electrical conductivity. Such dopants for inorganic semiconductors are being developed for several decades however, according to one of the co-authors of the article Dmitry Ivanov for organic conductors studied this trend is much more modest.
The main contribution of Ivanov's laboratory in this work has been reduced to the study of the physics of phase transitions, physics of mixing in such binary systems in other words - to find a suitable candidate from the standpoint of polymer physics.
They appeared derivative molecules called  -radial. This is a small planar molecule in which the carbon atoms are connected to form a triangular structure. Among other potentially interesting compounds  -radial is most suitable for energy unoccupied molecular orbital with the lowest energy. This means that the electrons are relatively easy to come off with it, becoming a free charges and increasing the conductivity of the material.  -Radilen thus becomes the strongest dopant for the organic semiconductor from those that are known in the scientific literature.
Radialenom experiments confirmed the results of quantum chemical calculations showing that the substance is well mixed with the polymer and allows them to increase the electrical conductivity in the tens or even hundreds of times. It has been found that up to 50 percent of the dopant content in the polymer phase separation does not occur, but the crystalline structure of the polymer is gradually changed. This meant that the dopant molecules are embedded in a polymer lattice and form there a so-called co-crystal.