Journal of Physical Chemistry & Biophysics
Open Access
ISSN: 2161-0398
+44 1478 350008
ISSN: 2161-0398
+44 1478 350008
Jose P M Serbena
UFPR, Brazil
Posters & Accepted Abstracts: J Phys Chem Biophys
Magnetic dependent properties of organic semiconductors have been observed since the 1960 and 1970 decades. However, since 2003 it has been more extensively studied and characterized, making use, mainly, of electronic device structures, like organic light emitting diodes, to access the intrinsic magnetic sensitive process. Usually, when the observable property of the studied organic device is resistance, the phenomenon is called organic magnetoresistance, and its quantification is made by the relative change of resistance when the sample is submitted to a magnetic field. The magnetoresistance phenomenon on organic semiconductors has been studied mostly on spin-coated or vacuum thermal sublimated materials and only recently on electrochemically synthesized materials. In this work, we report electrical measurements with and without an applied magnetic field on devices constructed in the sandwich structure indium tin oxide (ITO)/poly(bithiophene) (PBT)/aluminum (Al). The PBT polymer was electrochemically deposited on ITO. Optical characterization allowed us to obtain the band gap energy and electrical characterization at room and at low temperatures allowed us to obtain the whole mobility and the trapping states of PBT material and the energy barrier height at the ITO/PBT interface. The observed organic magnetoresistance dependence on direction between current and magnetic field, active layer thickness and temperature were also investigated.
Email: serbena@fisica.ufpr.br