Enhancement of organic magnetoresistance by electrical conditioning

2008 ◽  
Vol 92 (19) ◽  
pp. 193309 ◽  
Author(s):  
U. Niedermeier ◽  
M. Vieth ◽  
R. Pätzold ◽  
W. Sarfert ◽  
H. von Seggern
Keyword(s):  
Electrical Conditioning ◽  
Organic Magnetoresistance

On the role of hydrogen in organic magnetoresistance: A study of C60 devices

2007 ◽  
Vol 157 (22-23) ◽  
pp. 930-934 ◽  
Author(s):  
T.D. Nguyen ◽  
Y. Sheng ◽  
M. Wohlgenannt ◽  
T.D. Anthopoulos
Keyword(s):  
Organic Magnetoresistance

Frequency dependence of organic magnetoresistance

2010 ◽  
Vol 97 (12) ◽  
pp. 123301 ◽  
Author(s):  
W. Wagemans ◽  
P. Janssen ◽  
E. H. M. van der Heijden ◽  
M. Kemerink ◽  
B. Koopmans
Keyword(s):  
Frequency Dependence ◽  
Organic Magnetoresistance

Improvement of emission reliability of carbon nanotube emitters by electrical conditioning

2008 ◽  
Vol 516 (11) ◽  
pp. 3618-3621 ◽  
Author(s):  
J.H. Park ◽  
S.Y. Jeon ◽  
P.S. Alegaonkar ◽  
J.B. Yoo
Keyword(s):  
Carbon Nanotube ◽  
Electrical Conditioning

scholarly journals Hopping Magnetotransport via Nonzero Orbital Momentum States and Organic Magnetoresistance

2012 ◽  
Vol 108 (18) ◽  
Author(s):  
Alexandre S. Alexandrov ◽  
Valentin A. Dediu ◽  
Victor V. Kabanov
Keyword(s):  
Orbital Momentum ◽  
Organic Magnetoresistance

scholarly journals Role of electron-hole pair formation in organic magnetoresistance

2009 ◽  
Vol 79 (20) ◽  
Author(s):  
Sayani Majumdar ◽  
Himadri S. Majumdar ◽  
Harri Aarnio ◽  
Dirk Vanderzande ◽  
Reino Laiho ◽  
...  
Keyword(s):  
Pair Formation ◽  
Hole Pair ◽  
Electron Hole ◽  
Electron Hole Pair ◽  
Organic Magnetoresistance

Organic magnetoresistance based on hopping theory

2014 ◽  
Vol 23 (9) ◽  
pp. 097306 ◽  
Author(s):  
Fu-Jiang Yang ◽  
Shi-Jie Xie
Keyword(s):  
Organic Magnetoresistance

scholarly journals The effect of deuteration on organic magnetoresistance

2011 ◽  
Vol 161 (7-8) ◽  
pp. 608-612 ◽  
Author(s):  
N.J. Rolfe ◽  
M. Heeney ◽  
P.B. Wyatt ◽  
A.J. Drew ◽  
T. Kreouzis ◽  
...  
Keyword(s):  
Organic Magnetoresistance

Experimental Tests of Possible Mechanisms for the Organic Magnetoresistive Effect

2007 ◽  
Vol 1032 ◽  
Author(s):  
Tho Duc Nguyen ◽  
James Rybicki ◽  
Yugang Sheng ◽  
Markus Wohlgenannt
Keyword(s):  
Magnetic Field ◽  
Organic Semiconductors ◽  
Electrode Materials ◽  
Spin Dynamics ◽  
Experimental Tests ◽  
Triplet Exciton ◽  
Side Chain ◽  
Singlet Exciton ◽  
Organic Magnetoresistance ◽  
Magnetoresistive Effect

AbstractWe experimentally test three existing models of organic magnetoresistance (OMAR) which are all based on carrier spin dynamics. We first prove that hyperfine field originating from the hydrogen nuclei in organic materials is necessary for observing OMAR by studying C60 sandwich devices using several different electrode materials. We show that C60, unlike many other organic semiconductors, does not exhibit any intrinsic OMAR effect. However, we find that as soon as the carriers in C60 are brought in proximity with hydrogen-containing compounds, either in the form of a polymeric electrode, or side-chain substituents, a weak OMAR effect is observed. Next, we perform charge-induced absorption and electroluminescence spectroscopy in a polyfluorene organic magnetoresistive device. Our experiments allow us to measure the singlet exciton, triplet exciton and polaron densities in a live device under an applied magnetic field, and to distinguish between three models of OMAR. These models are based on different spin-dependent interactions, namely exciton formation, triplet exciton-polaron quenching and bipolaron formation. We show that the singlet exciton, triplet exciton and polaron densities and conductivity all increase with increasing magnetic field. Our data are inconsistent with the exciton formation and triplet-exciton polaron quenching models.

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