B9: Thin film and micro-crystal investigations on organic charge-transfer systems

Prof. Dr. Michael Huth
Physikalisches Institut, J. W. Goethe-Universität Frankfurt
Tel.: +49-69-798-47235
Fax: +49-69-798-47272
E-mail: michael.huth@physik.uni-frankfurt.de

In this project we will study the growth and the electronic properties of thins films of organic charge-transfer systems. Co-sublimation of donor and acceptor will be employed as a solvent-free synthesis route. The films are suitable for tunnelling spectroscopy and electrostatic field effect experiments, i.e. charge carrier density tuning. Emphasis will be on (BEDT-TTF)TCNQ with one structural variant showing an interaction-driven metal-insulator transition at 330K. Preliminary growth studies on new graphene-based acceptor and donor systems synthesised in project Müllen/Felser (B10) will be performed.

This project is complementary to the synthesis projects Aßmus/Ritter (B4) and Wagner/Holthausen/Baumgarten (B5), as well as the project Lang (B6) on selected bulk charge-transfer systems. Thin films on conducting substrates will enable photoemission experiments in project Aeschlimann/Felser/Schönhense (B8) even for insulating or semiconducting systems. A close collaboration is planned on new graphene-based systems targeted in the project Müllen/Felser (B10). Theoretical support will be provided by projects Jeschke/Valentí (B2) (band structure) and Gros (B7) (phase diagrams). With regard to studying Mott metal-insulator transitions the project is connected to Bloch (A1).
 

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