Electronic transport and magnetic properties of organic semiconductors

Abstract

The primary aim of this research thesis is to investigate the electronic transport and magnetic properties of organic semiconducting materials. Undeniably, experimental and theoretical work is needed to conclusively study spin injection, transport and relaxation mechanisms in these types of materials. Currently, one of the major challenges that exist for organic spin electronic devices is the control and understanding of the ferromagnetic-organic interface. This lack of control is counterproductive in achieving tuneable devices with substantial reliability. In order to adequately attend to this lack of control, considerable care must be taken to fabricate organic devices with precise dimensions while maintaining reproducible material quality. If these relevant parameters are accurately tuned with an acceptable tolerance level, a wealth of information can be obtained about spin transport in these devices. The main approach of this thesis was to systematically explore the temperature and magnetic field dependence of spin electronic transport of both crystalline and amorphous organic materials incorporating various spin injecting electrodes along with unique structural configurations.