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P-type thin film transistors (TFT) based on latest generation organic semiconductors (C8-BTBT, C10-DNTT) display excellent characteristics, with charge transport mobility of up to 10 cm2/Vs. These materials reach the quality levels of n-type oxide semiconductors, potentially enabling the development of a complementary technology (CMOS) for low-cost electronic circuits on large area flexible foils. Examples of potential applications for such circuits are RFID tags, smart packaging, flexible displays and numerous biomedical applications.

 

Among other things, the performance of organic TFT depends on the degree of crystallinity of the organic semiconductors. Higher ordering delivers better performance, and, the best TFTs are based on defect free single organic crystals. The production of thin films of defect free organic single crystals over large area is therefore highly desirable. This, however, remains a considerable challenge since the presence of only a few defects will negatively impact the spread of TFT characteristics. As the spread increases, the yield of circuits dramatically decreases.

 

In this internship we propose to work on the development of techniques to achieve the growth of highly ordered organic semiconductor, following two routes. A first route is the development of substrate treatments that help to template the growth of organic-semiconductors and increase their degree of order. Templating, that relies on a good match between the crystal structures of the substrate and the grown material, is very well known in the field of epitaxial growth of inorganic materials. In the field of organic, however, much remains to be done. A second route is the optimization of the semiconductor growth technique, either from solution or from vapor. Achieving a high degree of order requires a spatial separation of the crystal nucleation event and the subsequent crystal growth. This is best achieved in a system involving linear motion that pulls a growing front.

 

The work is mainly experimental and will include substrate preparation and treatment, organic semiconductor deposition, either from the vapor phase or from a solution, and the fabrication of TFTs to characterize the electrical properties of the templated layers.

 

Objectives for imec:

  • Explore the potential of substrate treatments to template the growth of high performance organic semi-conductors and achieve a better ordering.

  • Optimize our highly ordered organic semiconductor fabrication technologies.

 

Objectives for the candidate:

  • Learn fabrication techniques that are relevant in microelectronics.

  • Learn basics of crystal growth and TFT characterization.

  • Learn the design of experiments.

  • Work as a team in a professional research environment.

 

Skills required:

  • Material science background

  • Knowledge in electronics

  • Handy in the lab

  • Self-motivated and independent hard worker

Internship and Master Thesis topics

We currently have one open position for an internship/Master thesis in the framework of the Epos Crystalli project. We are looking for motivated engineering students who are available for a duration of 5 months or more.  If you are interested, please send you CV and motivation letter, along with your availabilities to Cédric Rolin.