Spin-dependent processes in organic devices [Elektronische Ressource] / Sebastian Schaefer

Spin-Dependent Processes in Organic Devices Dissertation to obtain the academic degree Dr. rer. nat. submitted to the Departement of Physics of Freie Universität Berlin by: Sebastian Schaefer Berlin, 2010 Betreuer: Dr. Wolfgang Harneit 1. Gutachter: Prof. Dr. R. Bittl 2. Gutachterin: Prof. Dr. M. Ch. Lux-Steiner Tag der Disputation: 2. Juni 2010 1AbstractBy bringing together a systematic IVharacterization and EDMR experiments, transport anddegradation processes were studied in organic devices. In a first step, two Zinc phthalocyanine (ZnPc) single layer devices with different electrodes were investigated, a coplanarAu/ZnPc/Au sample and a sandwich type ITO/ZnPc/Al device. They served as a testbed forthe correlation of IV- and EDMR measurements. The insights gained in this study were thenappliedtomorecomplexbilayerZnPc/C eterojunctionsolarcells.60A transport study at low voltages shows that bulk transport with Ohmic IV characteristics isdominantinthecoplanarZnPc,whereasthetransportinthesandwichdeviceiscontroledbyaSchottkybarrieratthealuminumcontact. BothsamplesshowSCLurrentswithexponentialtrap distribution in the high voltage limit, characteristic for ZnPc.