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@PHDTHESIS{Dyck:828398,
author = {Dyck, Tobias},
title = {{L}ight {T}rapping by {L}ight {T}reatment - {D}irect
{L}aser {I}nterference {P}atterning for the{T}exturing of
{F}ront {C}ontacts in {T}hin-{F}ilm {S}ilicon {S}olar
{C}ells},
volume = {359},
school = {RWTH Aachen},
type = {Dr.},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2017-02359},
isbn = {978-3-95806-208-5},
series = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
Umwelt / Energy $\&$ Environment},
pages = {vi, 172, XI S.},
year = {2017},
note = {RWTH Aachen, Diss., 2017},
abstract = {To further increase the energy conversion efficiency of
thin-film silicon solar cells, the minimization of
reflection losses by effective light trapping is essential.
Light trapping is achieved by introducing textured surfaces
in the layer stack of a solar cell. The incoming light is
scattered at the textured interfaces, the light paths within
the absorber layer are enhanced and the chance of absorption
rises. This work aims to develop an industrial feasible
laser-based process for the texturing of the aluminium-doped
zinc oxide (ZnO:Al) layer used as front contact in solar
cells. While wet chemical etching of the ZnO:Al is an
established process for the texturing, a laser-based process
offers higher flexibility and controllability of texture
scattering properties. Accordingly, the light trapping can
be engineered to fit the needs of a solar cell. Within this
work, five laser-based processing techniques are evaluated
for their applicability to texture ZnO:Al layers in an
industrial environment. The direct writing of textures is
capable of producing the right feature sizes and is highly
flexible. However, it has strong demands on the experimental
setup and requires long processing times. Refocusing the
laser light by a particle lens array as well as
laser-induced chemical etching also lack the industrial
feasibility due to the complex processing setup. The
creation of laser-induced periodical surface structures
(LIPSS) by ultra-short pulse lasers promises small feature
sizes with a simple setup. However, the flexibility of
feature sizes and shapes is limited. Only direct laser
interference patterning (DLIP) is capable of producing a
large variety of adjustable textures with right-sized
features while being able to cover large areas in reasonable
amounts of time with an industrial feasible processing
setup. To further investigate DLIP processing, a highly
exible three-beam interference setup was designed and
implemented. Within the setup, the beam properties of the
three partial beams can be adjusted completely
independently. By controlling power, polarization and angle
of incidence of the individual beams, the intensity
distribution within the overlapping volume is adjusted. This
intensity distribution then translates to a topography on
the ZnO:Al sample. With one single laser pulse, hundreds of
thousands strictly periodic micrometer and
submicrometer-sized features are created. [...]},
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/828398},
}