Degradation through Directional Self-Doping and Homogeneous Density of Recombination Centers Hindered by 1,8-Diiodooctane Additive in Non-Fullerene Organic Solar Cells
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comunitat-uji-handle2:10234/160292
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https://doi.org/10.1002/solr.202100024 |
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Title
Degradation through Directional Self-Doping and Homogeneous Density of Recombination Centers Hindered by 1,8-Diiodooctane Additive in Non-Fullerene Organic Solar CellsAuthor (s)
Date
2021-03-01Publisher
WileyISSN
2367-198XBibliographic citation
Almora, O., Wiegand, J., López-Varo, P., Matt, G.J. and Brabec, C.J. (2021), Degradation through Directional Self-Doping and Homogeneous Density of Recombination Centers Hindered by 1,8-Diiodooctane Additive in Non-Fullerene Organic Solar Cells. Sol. RRL, 5: 2100024. https://doi.org/10.1002/solr.202100024Type
info:eu-repo/semantics/articlePublisher version
https://onlinelibrary.wiley.com/doi/full/10.1002/solr.202100024Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
Non-fullerene-based organic solar cells (OSCs) have recently proven to perform
with efficiencies above 18%. This is an important milestone for one of the most
promising technologies in the fields of flexible and ... [+]
Non-fullerene-based organic solar cells (OSCs) have recently proven to perform
with efficiencies above 18%. This is an important milestone for one of the most
promising technologies in the fields of flexible and transparent/semitransparent
photovoltaics. However, the stability of OSCs is still a challenging issue to meet the
industry requirements. Herein, several devices with IT-4F:PM6 as the active layer
with and without 1,8-Diiodooctane (DIO) additive are characterized before and after
a 1400 h degradation test under 1 sun white light-emitting diode (LED) illumination
intensity. The optoelectronic study via impedance spectroscopy under illumination
at quasi-open-circuit correlates the use of DIO as an additive with a retarded
degradation behavior and an overall improved device performance. In dark conditions,
theMott–Schottky analysis suggests that samples without DIO develop selfdoping
during degradation, changing the p-i-n doping profile into a p–n type, most
likely related to the evolution of the blend demixing. These mechanisms are further
confirmed by drift-diffusion simulations. Space-oriented redistribution of shallow
trap levels (self-doping) and homogeneous increase in deep-trap levels (nonradiative
recombination) are shown to be hindered by the use of the DIO additive. [-]
Project code
871336
Project title or grant
Peroxis-Ground-Breaking Perovskite technologies for advanced X-Ray medical imaging systems
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