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Understanding Structural Differences in Completely Dry-Processed MAPbI3 Thin Films by Detailed Analyses of Temperature-Dependent Optical Spectroscopy

Title data

Witt, Christina ; Schötz, Konstantin ; Kuhn, Meike ; Leupold, Nico ; Biberger, Simon ; Ramming, Philipp ; Köhler, Anna ; Moos, Ralf ; Herzig, Eva M. ; Panzer, Fabian:
Understanding Structural Differences in Completely Dry-Processed MAPbI3 Thin Films by Detailed Analyses of Temperature-Dependent Optical Spectroscopy.
2023
Event: 2023 MRS Spring Meeting & Exhibit , April 10-14, 2023 , San Francisco, California, USA.
(Conference item: Conference , Poster )

Abstract in another language

In recent years, halide perovskites have attracted much attention due to remarkable increase in associated solar cell efficiencies, which were achieved by processing high quality thin films. Here, even small differences in film morphology seem to be relevant for optimized optoelectronic functionality and stability. However, a detailed understanding of how small morphological differences in perovskite films affect related structural and optoelectronic properties has not yet been fully developed. Here, we investigate the influence of small morphology differences induced in MAPbI3 thin films by (hot-)pressing, characterized by small increase in crystallographic orientation and grain size, on the structural properties phase transition, defects and energetic disorder. To this end, we perform detailed analyses of temperature-dependent absorption and PL measurements between 300 K and 5 K. We use MAPbI3 thin films prepared by a completely dry processing approach, comprising film formation based on mechanochemically synthesized MAPbI3 powder via powder aerosol deposition method, followed by (hot-)pressing. The latter has emerged as an attractive method for manufacturing and post-treatment of perovskite films. Detailed temperature-dependent absorption and PL analyses reveal lower strain, decreased defect density and less energetic disorder in films with higher out-ofplane orientation and grain size. To resolve even small differences in static energetic disorder, suitable, powerful analysis methods of the Urbach energy are presented. Our results demonstrate the importance of considering even small morphology differences in halide perovskite films regarding related structural and optoelectronic film properties. The gained knowledge will facilitate identifying structural differences in halide perovskites to further optimize their functionality and stability.

Further data

Item Type: Conference item (Poster)
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions
Research Institutions > Central research institutes
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: 14 Jun 2023 05:55
Last Modified: 09 Oct 2023 12:43
URI: https://eref.uni-bayreuth.de/id/eprint/81324