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@PHDTHESIS{Paetzold:205080,
author = {Paetzold, Ulrich Wilhelm},
title = {{L}ight {T}rapping with {P}lasmonic {B}ack {C}ontacts in
{T}hin-{F}ilm {S}ilicon {S}olar {C}ells},
volume = {185},
school = {RWTH Aachen},
type = {Dr.},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2015-05556},
isbn = {978-3-89336-895-2},
series = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
Umwelt / Energy $\&$ Environment},
pages = {X, 175 S.},
year = {2013},
note = {RWTH Aachen, Diss., 2013},
abstract = {Trapping light in silicon solar cells is essential as it
allows an increase in the absorptionof incident sunlight in
optically thin silicon absorber layers. This way, the
costsof the solar cells can be reduced by lowering the
material consumption and decreasingthe physical constraints
on the material quality. In this work, plasmonic light
trappingwith Ag back contacts in thin-film silicon solar
cells is studied. Solar cell prototypeswith plasmonic back
contacts are presented along with optical simulations of
thesedevices and general design considerations of plasmonic
back contacts.Based on three-dimensional electromagnetic
simulations, the conceptual design ofplasmonic
nanostructures on Ag back contacts in thin-film silicon
solar cells is studiedin this work. Optimizations of the
nanostructures regarding their ability to scatterincident
light at low optical losses into large angles in the silicon
absorber layers ofthe thin-film silicon solar cells are
presented. Geometrical parameters as well as theembedding
dielectric layer stack of the nanostructures on Ag layers
are varied. Periodicas well as isolated hemispherical Ag
nanostructures of dimensions above 200 nmare found to
scatter incident light at high efficiencies and low optical
losses. Hence,these nanostructures are of interest for light
trapping in solar cells. In contrast, smallAg nanostructures
of dimension below 100 nm are found to induce optical
losses.At the surface of randomly textured Ag back contacts
small Ag nanostructures existwhich induce optical losses. In
this work, the relevance of these localized plasmoninduced
optical losses as well as optical losses caused by
propagating plasmons areinvestigated with regard to the
reflectance of the textured back contacts. In
state-ofthe-art solar cells, the plasmon-induced optical
losses are shifted out of the relevantwavelength range by
incorporating a ZnO:Al interlayer of low refractive index at
theback contact. The additional but small potential for
increasing the reflection at theback contact with dielectric
interlayers of even lower refractive index, such as
SiO$_{2}$ and air, is demonstrated.},
cin = {IEK-5},
cid = {I:(DE-Juel1)IEK-5-20101013},
pnm = {121 - Solar cells of the next generation (POF3-121)},
pid = {G:(DE-HGF)POF3-121},
typ = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
url = {https://juser.fz-juelich.de/record/205080},
}