Charge transfer at organic semiconductor hetero-interfaces

In this project we plan to study charge transfer at organic semiconductor hetero-interfaces using the joint expertise of three groups. Our aim is to obtain a comprehensive understanding of the electronic processes involved by combining complementary experimental techniques, including growth and structural studies, electrical transport investigations, optical spectroscopy and analysis of the electronic structure. Interface doping is a promising approach to tune the electronic properties of organic semiconductors without significantly changing their molecular arrangement. We aim for observing and exploiting charge transfer effectsat organic donor-acceptor interfaces occurring in the ground state. Suitable material combinations allowing for charge transfer across their mutual interfaces will be identified and the electronic properties of the resulting organic semiconductor heterostructures will be studied. By systematically varying the energy level offset between the HOMO of the donor and the LUMO of the acceptor we plan to tune the electronic properties of the D/A interface.