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@ARTICLE{Privitera:904111,
author = {Privitera, Alberto and Warren, Ross and Londi, Giacomo and
Kaienburg, Pascal and Liu, Junjie and Sperlich, Andreas and
Lauritzen, Andreas E. and Thimm, Oliver and Ardavan, Arzhang
and Beljonne, David and Riede, Moritz},
title = {{E}lectron spin as fingerprint for charge generation and
transport in doped organic semiconductors},
journal = {Journal of materials chemistry / C},
volume = {9},
number = {8},
issn = {2050-7526},
address = {London [u.a.]},
publisher = {RSC},
reportid = {FZJ-2021-05681},
pages = {2944 - 2954},
year = {2021},
abstract = {We use the electron spin as a probe to gain insight into
the mechanism of molecular doping in a p-doped zinc
phthalocyanine host across a broad range of temperatures
(80–280 K) and doping concentrations (0–5 $wt\%$ of
F6-TCNNQ). Electron paramagnetic resonance (EPR)
spectroscopy discloses the presence of two main paramagnetic
species distinguished by two different g-tensors, which are
assigned based on density functional theory calculations to
the formation of a positive polaron on the host and a
radical anion on the dopant. Close inspection of the EPR
spectra shows that radical anions on the dopants couple in
an antiferromagnetic manner at device-relevant doping
concentrations, thereby suggesting the presence of dopant
clustering, and that positive polarons on the molecular host
move by polaron hopping with an activation energy of 5 meV.
This activation energy is substantially smaller than that
inferred from electrical conductivity measurements (∼233
meV), as the latter also includes a (major) contribution
from charge-transfer state dissociation. It emerges from
this study that probing the electron spin can provide rich
information on the nature and dynamics of charge carriers
generated upon doping molecular semiconductors, which could
serve as a basis for the design of the next generation of
dopant and host materials.},
cin = {IEK-5},
ddc = {530},
cid = {I:(DE-Juel1)IEK-5-20101013},
pnm = {1215 - Simulations, Theory, Optics, and Analytics (STOA)
(POF4-121)},
pid = {G:(DE-HGF)POF4-1215},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000625555700035},
doi = {10.1039/D0TC06097F},
url = {https://juser.fz-juelich.de/record/904111},
}