Title :
Large magnetoresistance at room temperature in semiconducting polymer sandwich devices
Author :
Wohlgenannt, M. ; Francis, T.L. ; Mermer, Ö ; Veeraraghavan, G.
Author_Institution :
Dept. of Phys. & Astron., Iowa Univ., Iowa City, IA, USA
Abstract :
A thin-film-sandwich device is fabricated consisting of poly(9,9-dioctylfluorenyl-2,7-diyl) sandwiched between two electrodes to study magnetoresistance (MR) effect in semiconducting polymer OLEDs. MR measurements at room temperature for different voltages show that MR traces are independent of the temperature and the angle between film plane and applied magnetic field. However a dependence on the film thickness is observed for an increase in turn-on voltage with increasing film thickness. Hence, MR effect is a bulk rather than an (electrode) interface effect.
Keywords :
electrodes; magnetoresistance; magnetoresistive devices; organic light emitting diodes; organic semiconductors; polymer films; sandwich structures; semiconductor thin films; 293 to 298 K; electrodes; interface effect; magnetoresistance; poly(9,9-dioctylfluorenyl-2,7-diyl); polymer film; room temperature; semiconducting polymer OLED; semiconducting polymer sandwich devices; thin-film-sandwich device; turn-on voltage; Electrodes; Magnetic field measurement; Magnetic films; Magnetoresistance; Organic light emitting diodes; Polymers; Semiconductivity; Semiconductor films; Temperature measurement; Voltage;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1464058
