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@PHDTHESIS{Flohre:834432,
author = {Flohre, Jan},
title = {{C}harakterisierung und {M}odifizierung von {K}upferoxid-
und {K}upfersulfid-{N}anopartikeln für
{D}ünnschichtsolarzellen},
volume = {379},
school = {RWTH Aachen},
type = {Dr.},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2017-04388},
isbn = {978-3-95806-241-2},
series = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
Umwelt / Energy $\&$ Environment},
pages = {141, ii S.},
year = {2017},
note = {RWTH Aachen, Diss., 2016},
abstract = {The present thesis deals with the characterization and
modification of semiconducting copper oxide and copper
sulfide nanoparticles with respect to their use as active
absorber material in an innovative solar cell concept. The
well-established silicon based thin-film solar cell
technology can be the basis for this concept and provides
cost-effective production. Important requirements for the
industrial relevance of the investigated materials, such as
being earth abundant, environmentally friendly, as well as
possessing both high absorption coeficients and suitable
band gaps are fulfilled. The advantage of the concept is the
decoupling of the nanoparticle absorber material
optimization process from the module production. In this
way, nanoparticles with high electronic quality can be
prepared by high temperature processes or in chemically
reactive environment while the subsequent module production
is realized by economic processes at low temperature.
Previous works have shown that proper annealing of the
copper(II) oxide (CuO) nanoparticles leads to high quality
material with respect to optoelectronic properties. In
particular, in reducing atmosphere at high temperatures the
phase transformation from CuO to copper(I) oxide (Cu$_{2}$O)
is possible. In the current thesis it is shown that laser
annealing in air leads to an improved micro-structure and a
reduced defect density of the CuO nanoparticles.
Furthermore, laser annealing in nitrogen atmosphere can
transform the starting material into Cu$_{2}$O. Laser
annealing has the advantage that selective parts of the
sample can be modified. Thus, substrates that are not
resistant to high temperature can be used and e.g. a post
treatment of the particles in the solar cell is possible.
Moreover, a CuO sample transformed into Cu$_{2}$O by
annealing at 1000 $^{\circ}$C in nitrogen atmosphere is
investigated by micro Raman and photoluminescence (PL)
scanning measurements. It is shown, that the variation of
structural properties is low while the variation of the
electronic properties, in particular the defect structure,
is very large. The characterization of the defect structure
is realized by studying PL spectra, which were taken at a
sample temperature of 93 K. Here, emission bands of
different defect transitions, as well as excitonic
transitions are detected and identified. The analysis of PL
spectra taken at sample temperatures between 93K to 290K
made it possible to calculate the excitonic band gap and the
full width at half maximum of the excitonic emission. Stress
in the crystal and the defect concentration are found to
have an impact to these quantities. Therefore, the values
are compared to those found in the literature of pure
Cu$_{2}$O bulk material. The comparison reveals an higher
defect concentration for the investigated Cu$_{2}$O [...]},
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/834432},
}