scholarly journals Magnetic field effect on excited-state spectroscopies ofπ-conjugated polymer films

2012 ◽  
Vol 85 (20) ◽  
Author(s):  
Bhoj R. Gautam ◽  
Tho D. Nguyen ◽  
Eitan Ehrenfreund ◽  
Z. Valy Vardeny
Keyword(s):  
Magnetic Field ◽  
Excited State ◽  
Polymer Films ◽  
Conjugated Polymer ◽  
Field Effect ◽  
Magnetic Field Effect

Quenching of the Magnetic Field Effect on the Photocurrent and Photocurrent Detected Magnetic Resonance in Conjugated Polymer-Fullerene Diodes

1999 ◽  
Vol 598 ◽  
Author(s):  
M. C. Scharber ◽  
C. J. Brabec ◽  
F. Padinger ◽  
N. S. Sariciftci
Keyword(s):  
Magnetic Field ◽  
Magnetic Resonance ◽  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Metal Electrode ◽  
Polymer Devices ◽  
Plastic Solar Cells ◽  
The Magnetic Field

ABSTRACTWe have studied the effect of a magnetic field on the photocurrent of MDMO-PPV (poly(2-methoxy,5-(3',7'-dimethyloctyloxy)-1,4-phenylenevinylene) and MDMOPPV/fullerene diodes (plastic solar cells) and performed photocurrent detected magnetic resonance (PCDMR) experiments on these devices consisting of an active layer sandwiched between a low and a high workfunction metal electrode. Results clearly show that the magnetic field effect (MFE) on the photocuttent as well as PCDMR signals are quenched in conjugated polymer/fullerene composite devices in contrast to large signals observed in the pristine conjugated polymer devices. Photoinduced electron transfer from conjugated polymers onto fullerene is proposed to be responsible for this quenching.

scholarly journals Lowest Excited-State Impurity Binding Energy in InGaN/GaN Parabolic QWW: Magnetic Field Effect

2013 ◽  
Vol 23 (3) ◽  
pp. 275 ◽  
Author(s):  
Haddou El Ghazi ◽  
Anouar Jorio ◽  
Izeddine Zorkani
Keyword(s):  
Magnetic Field ◽  
Excited State ◽  
Binding Energy ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Shallow Donor ◽  
Effective Radius ◽  
Transversal Section ◽  
Mass Approximation ◽  
Quantum Well Wire

In this paper, we have investigated the magnetic field effect on the lowest excited-state binding energy of hydrogenic shallow-donor impurity in wurtzite (In,Ga)N/GaN parabolic transversal-section quantum-well wire (PQWW) using the finite-difference method within the quasi-one-dimensional effective potential model. The calculations are performed within the framework of the effective mass approximation. A cylindrical QWW effective radius is taken into account to describe the lateral confinement strength. The numerical results show that: (i) the probability density is the largest on a circularity whose radius is the effective radius and (ii) the lowest excited-state binding energy is the largest when an impurity is located on this circularity while it starts to decrease as the impurity is away from the circularity.

The Model for Calculation the Hall Effect Parameter

2004 ◽  
Vol 9 (2) ◽  
pp. 129-138
Author(s):  
J. Kleiza ◽  
V. Kleiza
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Mapping Method ◽  
Sample Thickness ◽  
System Of Nonlinear Equations ◽  
Specific Resistivity ◽  
Conformal Mapping Method ◽  
Effect Parameter ◽  
The Magnetic Field

A method for calculating the values of specific resistivity ρ as well as the product µHB of the Hall mobility and magnetic induction on a conductive sample of an arbitrary geometric configuration with two arbitrary fitted current electrodes of nonzero length and has been proposed an grounded. During the experiment, under the constant value U of voltage and in the absence of the magnetic field effect (B = 0) on the sample, the current intensities I(0), IE(0) are measured as well as the mentioned parameters under the effect of magnetic fields B1, B2 (B1 ≠ B2), i.e.: IE(β(i)), I(β(i)), i = 1, 2. It has been proved that under the constant difference of potentials U and sample thickness d, the parameters I(0), IE(0) and IE(β(i)), I(β(i)), i = 1, 2 uniquely determines the values of the product µHB and specific resistivity ρ of the sample. Basing on the conformal mapping method and Hall’s tensor properties, a relation (a system of nonlinear equations) between the above mentioned quantities has been found.

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