title: Magnetic field effects in pi-conjugated polymer-fullerene blends: evidence for multiple components.
abstract: We studied magnetoconductance (MC) and magnetoelectroluminescence (MEL) in organic diodes from blends of pi-conjugated polymers and fullerenes at various concentrations, c. The MC response is composed of several components that depend on the applied bias voltage and c. A dominant positive low-field (LF) component, which also governs the MEL response, dramatically decreases and broadens in the blends, thus unraveling a positive high-field and negative LF components. The positive MC components are caused by electrostatically bound e-h polaron pairs in unblended devices, and charge transfer pairs in the blends, which are dominated by two different field-induced spin sublevel mixing mechanisms. In contrast, the negative LF response is due to e-e and h-h pairs; this is confirmed by studying MC in electron- and hole-unipolar devices, which lack positive MC response.
authors.affiliation: Department of Physics, University of Utah, Salt Lake City, Utah 84112, USA.
authors.forename: F J
authors.initials: FJ
authors.lastname: Wang
authors.forename: Heinz
authors.initials: H
authors.lastname: Bässler
authors.forename: Z Valy
authors.initials: ZV
authors.lastname: Vardeny