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Scholz, Till ; Xu, Tianshan ; Köhler, Anna ; Moos, Ralf:
Defect Chemical Engineering in Doped MAPbI₃ Films Prepared from Mechanochemically Synthesized Powders via Powder Aerosol Deposition.
2025
Veranstaltung: 8th International Conference on Perovskite Solar Cells and Optoelectronics - PSCO 2025
, 15.9.-18.9.2025
, Perugia, Italy.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Poster
)
Abstract
Hybrid halide perovskites such as MAPbI₃ offer excellent optoelectronic properties, yet their long-term stability remains a major challenge due to ionic defects and associated ion migration. Understanding and controlling these defect populations is therefore critical for improving device performance and operational lifetimes. In this study we combine mechanochemical powder synthesis with powder aerosol deposition (PAD), providing a fully solvent-free route for film preparation, enabling controlled incorporation of dopants and systematic variation of defect concentrations. This combination allows targeted studies of defect chemistry and its influence on material properties, while yielding dense, homogeneous films on various substrates for structural, electrical, and defect characterization. In particular, electrical measurements under controlled iodine partial pressure allow direct investigation of defect equilibria and their impact on charge transport. Powders were doped with Cu, Au, Sb, Na and In at various concentrations. SEM analysis revealed differences in powder morphology depending on the incorporated dopants. Films were prepared via PAD using doped powders, resulting in dense, adherent layers with thicknesses ranging from 2 to 100 μm. Powders and Films were analyzed at DESY, revealing subtle but distinct dopant-dependent differences in the structural properties. Impedance spectroscopy under controlled iodine partial pressure revealed the influence of dopants on defect-mediated conductivity. The adjustable iodine chemical potential enables direct investigation of defect equilibria and charge transport. This approach provides new opportunities for understanding and controlling defects in perovskite materials.
Weitere Angaben
| Publikationsform: | Veranstaltungsbeitrag (Poster) |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos Profilfelder > Advanced Fields > Neue Materialien Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayreuther Materialzentrum - BayMAT |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 09 Okt 2025 07:28 |
| Letzte Änderung: | 09 Okt 2025 07:52 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/94851 |