Magnetic Field Effects of Charge Transfer Excitons in Organic Semiconductor Devices

The topic of this review is the effect of magnetic field on photo‐current (PC) in organic semiconductor devices. Magnetic field modifies the fraction of the singlet/triplet population in the charge transfer excitons (CTE) whose lifetime is spin configuration dependent yielding magneto‐PC (MPC). We r...

Full description

Saved in:
Bibliographic Details
Published in:Israel journal of chemistry 2022-08, Vol.62 (7-8), p.n/a
Main Authors: Nikiforov, Daniel, Ehrenfreund, Eitan
Format: Article
Language:English
Subjects:
Charge transfer
charge transfer exciton
Excitons
magnetic field effect
Magnetic fields
organic semiconductor
Parameters
Physical properties
Polarization (spin alignment)
Semiconductor devices
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The topic of this review is the effect of magnetic field on photo‐current (PC) in organic semiconductor devices. Magnetic field modifies the fraction of the singlet/triplet population in the charge transfer excitons (CTE) whose lifetime is spin configuration dependent yielding magneto‐PC (MPC). We review MPC in the framework of the polaron pair model and emphasize the effect of CTE lifetime on MPC. In addition to a detailed calculation of the MPC response we find a range of physical parameters in which the response follows a simple ′fit function′. For example, a sum of wide and narrow Lorentzian functions, MPC(B)=cwB2/(B2+bw2)+cnB2/(B2+bn2), in the case of hyperfine interaction; or a Voigt profile V=L*G, where the sign * stands for the convolution operation between a Lorentzian (L) and a Gaussian (G) functions, in the case of thermal spin polarization. We provide expressions for the fit parameters in terms of physical parameters.
ISSN:0021-2148
1869-5868
DOI:10.1002/ijch.202100091