Journal: APL Energy

Abbreviation

APL Energy

Publisher

American Institute of Physics

Journal Volumes

ISSN

2770-9000

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2024 - 20252
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Publications 1 - 2 of 2
  • Optimizing perovskite LEDs and tandem PV cells: The role of photon-recycling and luminescent coupling in presence of strong light scattering
    Item type: Journal Article
    Zeder, Simon J.; Blülle, Balthasar; Ruhstaller, Beat; et al. (2025)
    APL Energy
    Photon recycling (PR) in light-emitting and light-absorbing devices with incoherent scattering is investigated using a novel optical framework, self-consistently coupled to electrical models for current- and voltage-controlled devices to trace the inherent optoelectronic backcoupling associated with PR. This study reveals a universal competition between photon re-absorption and scattering processes, which governs performance across device types. In light-emitting diodes, the optimal emitter layer thickness is highly sensitive to scattering outcoupling structures and PR; their consideration in modeling is crucial. In addition, scattering structures impose stricter radiative efficiency requirements for PR to remain beneficial, highlighting the trade-off between loss mitigation and re-absorption penalties. For photovoltaic devices, the impact of front texturing on PR and luminescent coupling (LC) in perovskite-silicon tandem solar cells is quantified, including the first demonstration of luminescent self-coupling at the emissive perovskite-coated texture. While the texture minimally affects PR/LC overall, both scattering and re-absorption redistribute photogeneration. LC enhances tandem efficiency by 4.4%(abs) in the Auger limit for bottom-limited configurations, illustrating how photon redirection alleviates current-matching constraints. (c) 2025 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution-NonCommercial 4.0International (CC BY-NC) license (https://creativecommons.org/licenses/by-nc/4.0/)
  • Photovoltaic limitations of FAPbI3 nanocrystal solar cells associated with ligand washing processes
    Item type: Journal Article
    Galatopoulos, Fedros; Papagiorgis, Paris; Ioakeimidis, Apostolos; et al. (2024)
    APL Energy
    The processing of perovskite nanocrystals (PNCs) solar cells (SCs) usually incorporates ligand washing (LW) procedures. We show that a LW step of FAI in EtAc assists in the removal of the oleic acid/oleylamine ligands and improves the JSC and FF values of FAPbI3 based SCs. Although by increasing the exposure time of EtAc the removal of oleic acid/oleylamine ligands is more effective, sintering/necking of the FAPbI3 results to NC agglomerations and formation of defects/traps are observed within the active layer by the reported photoluminescence studies. Despite identifying the balanced in LW procedure exposure time, limitations on the performance of FAPbI3 PNCs SCs are reported. To identify the photovoltaic limitations impedance spectroscopy studies are presented and show that in the case of FAPbI3 PNC SCs an intermediate frequency response manifests. The observed impedance spectroscopy intermediate frequency response correlates with a parasitic resistance effect, indicating charge transport limitations and charge recombination losses even after the applied LW processing procedure.
Publications 1 - 2 of 2