Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Hybrid and Perovskite Photovoltaics III

CPP 24.2: Vortrag

Mittwoch, 19. März 2025, 09:45–10:00, H38

Optical In-Situ Methods as Process Optimization Toolbox — •Lennart Reb — Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109, Berlin

In the field of perovskite photovoltaics, precursor optimization is often guided by the visual inspection of film quality by experienced researchers. However, combined optical in-situ techniques can help shift toward rational, evidence-based process design. In-situ characterization methods are frequently used for studying the reaction kinetics during processing: Optical techniques to monitor solvent evaporation, such as spectral absorption, reveal changes in halidoplumbate spectral signatures that correlate with the increasing density of polynuclear plumbate species. Photoluminescence (PL) measurements further elucidate early perovskite nucleation during quenching processes and crystal growth. Structural insights from grazing-incidence X-ray scattering (GIWAXS) track intermediate phases, the formation of perovskite structures, and the evolution of secondary phases. This work briefly reviews the state-of-the-art multimodal in-situ characterization techniques and introduces the multimodal µ slot-die coater, a small-scale platform integrating UV-vis, PL, imaging, and GIWAXS capabilities. Initial results of combined measurements demonstrate its power for studying perovskite film formation during scalable processing, offering insights into reaction kinetics and showcasing the capabilities of in-situ imaging techniques in scalable perovskite deposition. For example, in-situ PL measurements show the changes of PL signal over time upon the inclusion of chloride-based additives.

Keywords: In-Situ; UV-vis; Photoluminescence; Slot-die; GIWAXS