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Date: 11-04-15

Larger doping molecule enhance performance of organic semiconductor

The advantages of organic semiconductor such as easy to manufacture, and the flexibility of the material helps in developing low-cost electronics for lot more new applications. By using simple printing technologies, the liquid electronics semiconductor material can be printed into electronics circuits. All this can be done at room temperature.

Whereas in case of silicon or any other such crystal-structured semiconductor material, the process of producing crystalline silicon material is expensive and complex process, consuming lot of energy and complex manufacturing equipment. Due to which electronics made out of silicon is expensive for lot of new applications such as e-tags for inventory management and many such disposable products.

The cheap organic semiconductor material combined with easy manufacturing can create a new industry. Another interesting area for organic semiconductor material is printing/painting solar PV panels on any flat surface.

If you look at issues making organic semiconductor material not successful; one of the major issue is lack of enough conductivity in organic semiconductor material.

Now researchers are trying out improving the conductivity of organic semiconductor material by innovative doping methods. A team from the University of Bath, UK, working with scientists in Germany and The Netherlands, to fix the problems associated with using organic semiconductors.

In a study published in the journal Nature Communications, researchers found that the size and geometrical position of the doping molecule used had an effect on the efficiency of the semiconductor material.

The release from the University of Bath states "One way of improving the electrical properties of organic semiconductors is to mix them with ‘doping’ molecules, which work by adding electrical charges to the polymer."

Dr Enrico Da Como from the University's Department of Physics who led the study says “The organic polymer consists of a chain of units which is mixed with the doping molecule before it is printed onto a surface. We found that the doping molecule can bind to the polymer in several different orientations, some of which make a more effective semiconductor than others." “Our work suggests that if you use a larger doping molecule, you limit the number of ways it can bind to the polymer, making the efficiency of the semiconductor more consistent.” adds Dr Enrico Da Como.

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