Projects / Programmes
Electric charge transport in organic semiconducting thin films
| Code |
Science |
Field |
Subfield |
| 1.02.01 |
Natural sciences and mathematics |
Physics |
Physics of condesed matter |
| Code |
Science |
Field |
| P002 |
Natural sciences and mathematics |
Physics |
organic transistors, charge transport, thin films
Researchers (1)
| no. |
Code |
Name and surname |
Research area |
Role |
Period |
No. of publicationsNo. of publications |
| 1. |
22305 |
PhD Egon Pavlica |
Physics |
Head |
2007 - 2009 |
0 |
Organisations (1)
Abstract
The theory of electric charge transport in organic semiconductors is still in development. Although the organic semiconducting materials are already used in functional prototypes of different optoelectronic devices and even in the production of simple displays. However organic semiconductor exhibit also disadvantages that limit their use, e.g. current instability when exposed to atmosphere. The proposal is focused on the study of electric transport in thin layers of organic semiconductors. This structure of organic semiconductors is frequently used in optoelectronic devices. The research will be performed in organic transistors, based on sexithiophene (6T) and polihexylthiophene (P3HT) materials. Accordingly, a complete set of electrical characterization measurements will be obtained: current dependence on voltage measurement, current time stability measurement, spectroscopy of transport states, thin film topography and potentiometry with use of atomic force microscopy. During the measurements, the samples will be mounted in vacuum or in a controlled nitrogen atmosphere. Wide range of parameters will be scanned: sample temperature in range between 100K and 400K, the distance between electrodes, the width of the electrodes and the thickness of organic layer. The measurement results will be analysed in a frame of currently valid theoretical models. Accordingly, the theoretical models will be evaluated, improving the knowledge of charge transport and related phenomena in organic semiconductor thin layers as well as in organic semiconductor/metal interfaces. The results of the research project will contribute to the knowledge in the field of charge transport in organic semiconductors. Potential use of research findings is in optimization of optoelectronic devices based on organic semiconductors.
Significance for science
we developed a procedure to prepare a prototype sensor for sensing biomaterials. The sensor is based on the organic semiconductor transistor. In parallel, we developed a protocol, that is used to attach different protein molecules to the insulating layer of the organic transistor device. We have tested different proteins, including BSA, Azurin and 3BLG with corresponding antibodies. Accordingly, we succeeded to prepare a thin film of pentacene - an organic semiconductor. The film was not completely covering the surface. Using the protocol we successfuly attached Azurin proteins in the gaps of pentacene film. Attached at this particular position, the Azurin proteins represent the bridge between semiconducting pentacene grains. Moreover, Azurin proteins play the role of a sensing switch, which is activated when the corresponding molecule appears.
Significance for the country
The results of the project have promoted the research of sensors, which are based on the organic semiconductors. Due to their nature, organic semiconductors can be engineered to obtain different physical and photochemical properties, therefore the results of the project open many application possibilities. The results of the project can be implemented in the construction of a sensor, which is based on the bonding of a protein-antibody pair.
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