Journal
PHYSICAL REVIEW B
Volume 94, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.075201
Keywords
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Funding
- National Natural Science Foundation of China (China) [61505243, 61574166, 61306117]
- Youth Innovation Promotion Association CAS [2015095]
- Beijing Training Project for the Leading Talents in ST [Z151100000315008]
- Opening Project of Key Laboratory of Microelectronic Devices and Integrated Technology, Institute of Microelectronics of Chinese Academy of Sciences
- CAEP Microsystem and THz Science and Technology Foundation [CAEPMT201504]
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The fact that in organic semiconductors the Hubbard energy is usually positive appears to be at variance with a bipolaron model to explain magnetoresistance (MR) in those systems. Employing percolation theory, we demonstrate that a moderately positive U is indeed compatible with the bipolaron concept for MR in unipolar current flow, provided that the system is energetically disordered, and the density of states (DOS) distribution is partially filled, so that the Fermi level overlaps with tail states of the DOS. By exploring a broad parameter space, we show that MR becomes maximal around U = 0 and even diminishes at large negative values of U because of spin independent bipolaron dissociation. Trapping effects and reduced dimension enhance MR.
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