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@PHDTHESIS{Staub:885607,
author = {Staub, Florian},
title = {{T}ime-{R}esolved {P}hotoluminescence on {P}erovskite
{A}bsorber {M}aterials for {P}hotovoltaic {A}pplications},
volume = {513},
school = {Universität Duisburg},
type = {Dissertation},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2020-03959},
isbn = {978-3-95806-503-1},
series = {Schriften des Forschungszentrums Jülich. Reihe Energie
$\&$ Umwelt / Energy $\&$ Environment},
pages = {viii, 198 S.},
year = {2020},
note = {Universität Duisburg, Diss., 2020},
abstract = {Time-resolved photoluminescence has become a commonly used
tool to mainly determine charge-carrier lifetimes in metal
halide perovskites. In this thesis, I investigate
photoluminescence transients regarding radiative and
non-radiative charge-carrier recombination as well as
charge-carrier separation by diffusion. Additionally, I
focus on the so-called photon recycling effect. Photon
recycling refers to the self-absorption of photons, which
have been generated by radiative recombination of excited
states, within the absorber material itself. As photon
recycling is directly linked with the radiative
recombination process, the presence of photon recycling is
actually masked and not obvious in photoluminescence
transients. Here, I reveal the presence of photon recycling
in thin-film perovskites by reporting that the obtained
apparent radiative recombination rate can be manipulated by
modifying only the optical design of the sample stack; i. e.
tuning the probability of photonreabsorption in the absorber
layer by altering the light management in the stacks.
Furthermore, perovskite single crystals have been
investigated by time-resolved photoluminescence to study the
impact of reabsorption in more detail. I show that photon
recycling supports the preservation of charge carriers but
does not enable efficient charge-carrier transportation over
long distances. Spectral shifts observed in the transient
measurements are the result of altering reabsorption
characteristics as the recombination zone expands over time
into the bulk mainly as a consequence of charge-carrier
diffusion. Understanding photon recycling and recombination
processes is important for photovoltaic devices as these
mechanisms affect the open-circuit voltage. Based only on
the findings from time-resolved photoluminescence, I
demonstrate how to predict the maximum attainable
open-circuit voltage, which the investigated perovskite
absorber layer embedded in a solar cell stack could ideally
provide. This approach helps to estimate the photovoltaic
potential of any absorber layer based on its material
quality without the need of fabricating an entire solar cell
first.},
cin = {IEK-5},
cid = {I:(DE-Juel1)IEK-5-20101013},
pnm = {899 - ohne Topic (POF3-899)},
pid = {G:(DE-HGF)POF3-899},
typ = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
url = {https://juser.fz-juelich.de/record/885607},
}