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Issue 17, 2018
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Sign reversal of magneto-capacitance in an organic heterojunction based opto-spintronic system

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Abstract

Magneto-capacitance is a unique characteristic in organic semiconductors without involving ferromagnetism and ferroelectricity due to some purely spin-related dynamic processes. In this work, we report a remarkably magneto-capacitive effect (∼0.8%) in an organic opto-spintronic device comprising an NPB (N,N′-bis(naphthalene-1-yl)-N,N′-bis(phenyl)benzidine)/C60 heterojunction at excited states in ambient temperature. We have found that it is possible to achieve both positive and negative magneto-capacitance for such a device at different field strengths upon photo-excitation and ac-electric field modulation. Owing to the largely imbalanced charge carrier mobilities of NPB and C60; and, based on our theoretical fittings by the empirical Lorentzian formula, the effect can be attributed to the competition between the spin-dependent dissociation and bi-molecular recombination mechanisms at different field strengths under ac-frequency modulation and different illumination intensities. We believe a complete understanding of such an effect may shed a new light on the wide applications of the organic heterojunction based organic opto-spintronic system.

Graphical abstract: Sign reversal of magneto-capacitance in an organic heterojunction based opto-spintronic system

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Supplementary files

Article information


Submitted
07 Jan 2018
Accepted
28 Mar 2018
First published
30 Mar 2018

J. Mater. Chem. C, 2018,6, 4671-4676
Article type
Paper

Sign reversal of magneto-capacitance in an organic heterojunction based opto-spintronic system

L. Luan, K. Wang and B. Hu, J. Mater. Chem. C, 2018, 6, 4671 DOI: 10.1039/C8TC00092A

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