at Google ScholarTitle data
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
Event: 8th International Conference on Perovskite Solar Cells and Optoelectronics - PSCO 2025
, 15.9.-18.9.2025
, Perugia, Italy.
(Conference item: Conference
,
Poster
)
Abstract in another language
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.
Further data
| Item Type: | Conference item (Poster) |
|---|---|
| Refereed: | Yes |
| Institutions of the University: | Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos Profile Fields > Advanced Fields > Advanced Materials Research Institutions > Central research institutes > Bayreuth Center for Material Science and Engineering - BayMAT |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 600 Technology, medicine, applied sciences > 620 Engineering |
| Date Deposited: | 09 Oct 2025 07:28 |
| Last Modified: | 09 Oct 2025 07:52 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/94851 |