On the role of minority carriers in the frequency dependence of organic magnetoresistance

Paul Janssen; W. Wagemans; Wouter Verhoeven; E.H.M. van der Heijden; M. Kemerink; B. Koopmans

doi:10.1016/j.synthmet.2011.01.013

On the role of minority carriers in the frequency dependence of organic magnetoresistance

Paul Janssen, W. Wagemans, Wouter Verhoeven, E.H.M. van der Heijden, M. Kemerink, B. Koopmans

Research output: Contribution to journal › Article › Academic › peer-review

5 Citations (Scopus)

3 Downloads (Pure)

Abstract

In this work we investigate the frequency dependence of organic magnetoresistance (OMAR) both in small molecule-based (Alq3) and polymer (PPV derivative) materials, and investigate its thickness dependence. For all devices, we observed a strong decrease in magnetoconductance (MC) with increasing frequency of the ac component of the applied magnetic field. Moreover, we observed a strong reduction of the cut-off frequencies for increasing film thickness. By means of admittance spectroscopy and device simulations, we show that the cut-off frequency is related to the inverse transit time of the minority charge carriers. These observations confirm the important role of minority carriers in OMAR, and show that changes in OMAR are not only due to microscopic mechanisms, but also device physics is of significant relevance. Keywords: Organic semiconductor; Magnetoresistance; Carrier mobility; Minority carriers; Transit time

Original language	English
Pages (from-to)	617-621
Number of pages	4
Journal	Synthetic Metals
Volume	161
Issue number	7-8
DOIs	https://doi.org/10.1016/j.synthmet.2011.01.013
Publication status	Published - 2011

Access to Document

10.1016/j.synthmet.2011.01.013

Cite this

@article{68f1dd8d92794880a70539023cafd4da,

title = "On the role of minority carriers in the frequency dependence of organic magnetoresistance",

abstract = "In this work we investigate the frequency dependence of organic magnetoresistance (OMAR) both in small molecule-based (Alq3) and polymer (PPV derivative) materials, and investigate its thickness dependence. For all devices, we observed a strong decrease in magnetoconductance (MC) with increasing frequency of the ac component of the applied magnetic field. Moreover, we observed a strong reduction of the cut-off frequencies for increasing film thickness. By means of admittance spectroscopy and device simulations, we show that the cut-off frequency is related to the inverse transit time of the minority charge carriers. These observations confirm the important role of minority carriers in OMAR, and show that changes in OMAR are not only due to microscopic mechanisms, but also device physics is of significant relevance. Keywords: Organic semiconductor; Magnetoresistance; Carrier mobility; Minority carriers; Transit time",

author = "Paul Janssen and W. Wagemans and Wouter Verhoeven and {van der Heijden}, E.H.M. and M. Kemerink and B. Koopmans",

year = "2011",

doi = "10.1016/j.synthmet.2011.01.013",

language = "English",

volume = "161",

pages = "617--621",

journal = "Synthetic Metals",

issn = "0379-6779",

publisher = "Elsevier",

number = "7-8",

}

TY - JOUR

T1 - On the role of minority carriers in the frequency dependence of organic magnetoresistance

AU - Janssen, Paul

AU - Wagemans, W.

AU - Verhoeven, Wouter

AU - van der Heijden, E.H.M.

AU - Kemerink, M.

AU - Koopmans, B.

PY - 2011

Y1 - 2011

N2 - In this work we investigate the frequency dependence of organic magnetoresistance (OMAR) both in small molecule-based (Alq3) and polymer (PPV derivative) materials, and investigate its thickness dependence. For all devices, we observed a strong decrease in magnetoconductance (MC) with increasing frequency of the ac component of the applied magnetic field. Moreover, we observed a strong reduction of the cut-off frequencies for increasing film thickness. By means of admittance spectroscopy and device simulations, we show that the cut-off frequency is related to the inverse transit time of the minority charge carriers. These observations confirm the important role of minority carriers in OMAR, and show that changes in OMAR are not only due to microscopic mechanisms, but also device physics is of significant relevance. Keywords: Organic semiconductor; Magnetoresistance; Carrier mobility; Minority carriers; Transit time

AB - In this work we investigate the frequency dependence of organic magnetoresistance (OMAR) both in small molecule-based (Alq3) and polymer (PPV derivative) materials, and investigate its thickness dependence. For all devices, we observed a strong decrease in magnetoconductance (MC) with increasing frequency of the ac component of the applied magnetic field. Moreover, we observed a strong reduction of the cut-off frequencies for increasing film thickness. By means of admittance spectroscopy and device simulations, we show that the cut-off frequency is related to the inverse transit time of the minority charge carriers. These observations confirm the important role of minority carriers in OMAR, and show that changes in OMAR are not only due to microscopic mechanisms, but also device physics is of significant relevance. Keywords: Organic semiconductor; Magnetoresistance; Carrier mobility; Minority carriers; Transit time

U2 - 10.1016/j.synthmet.2011.01.013

DO - 10.1016/j.synthmet.2011.01.013

M3 - Article

SN - 0379-6779

VL - 161

SP - 617

EP - 621

JO - Synthetic Metals

JF - Synthetic Metals

IS - 7-8

ER -

On the role of minority carriers in the frequency dependence of organic magnetoresistance

Abstract

Access to Document

Fingerprint

Cite this