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J Chem Phys. 2014 Apr 14;140(14):144110. doi: 10.1063/1.4869936.

Investigation of giant magnetoconductance in organic devices based on hopping mechanism.

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  • School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.


We suggest a spin-dependent hopping mechanism which includes the effect of the external magnetic field as well as hyperfine interaction (HFI) to explain the observed giant magnetoconductance (MC) in non-magnetic organic devices. Based on the extended Marcus theory, we calculate the MC by using the master equation. It is found that a MC value as large as 91% is obtained under a low driving voltage. For suitable parameters, the theoretical results are in good agreement with the experimental data. Influences of the carrier density, HFI, and the carrier localization on the MC value are investigated. Especially, it is found that a low-dimensional structure of the organic materials is favorable to get a large MC value.

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