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Issue 21, 2013
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Organic spin-valves: from unipolar to bipolar devices

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We review the recent advances in both unipolar and bipolar organic spin valves. We discuss mechanisms that dominate the spin relaxation of injected spin aligned carriers and limit their spin diffusion length. A space charge limited current model with ferromagnetic electrodes is used to describe the bipolar organic spin valve operation. For unipolar spin valves we take into account finite spin diffusion length and obtain a general expression that is valid for devices with thick organic interlayers. For bipolar spin valves where the injected spin aligned electrons and holes selectively form polaron pairs having singlet or triplet spin configurations, we obtain modified expressions for the magneto-resistance and magneto-electroluminescence and show that they are proportional to the difference in singlet–triplet generation rates and the spin injection polarization degree of the ferromagnetic electrodes.

Graphical abstract: Organic spin-valves: from unipolar to bipolar devices

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Publication details

The article was received on 12 Feb 2013, accepted on 04 Apr 2013 and first published on 25 Apr 2013

Article type: Perspective
DOI: 10.1039/C3CP50639H
Citation: Phys. Chem. Chem. Phys., 2013,15, 7967-7975
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    Organic spin-valves: from unipolar to bipolar devices

    E. Ehrenfreund and Z. Valy Vardeny, Phys. Chem. Chem. Phys., 2013, 15, 7967
    DOI: 10.1039/C3CP50639H

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