Dresden 2020 – wissenschaftliches Programm
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CPP 100: Focus: In-situ probes toward better understanding of hybrid halide perovskites (PhD symposium) I (joint session CPP/AKjDPG)
CPP 100.3: Vortrag
Donnerstag, 19. März 2020, 18:00–18:15, ZEU 222
Small-Footprint Optical Monitoring to Study Perovskite Thin Film Formation — Aboma Merdasa1,2, Rahim Munir1, Carolin Rehermann1, Katrin Hirselandt1, Janardan Dagar1, Klara Suchan2, and •Eva Unger1,2 — 1Helmholtz-Zentrum Berlin — 2Lund University, Sweden
Record performance of Metal-Halide Perovskite (MHP) based solar cells have been achieved for small area devices based on spin-coating. Developing this device technology towards larger area prototypes will require the utilisation of scalable process technology. Processing strategies developed for spin-coating have been developed by incremental modifications of MHP ink and process conditions. Translating these processing strategies to scalable process technology requires a fundamental understanding of the formation mechanism. We recently developed a small-footprint spectroscopy setup based on fibre-optics enabling the monitoring of thin film formation processes. The setup can be easily integrated in process equipment such as spin-coater or slot-die coaters. UV-Vis measurements in reflectance mode enable us to describe the thinning of precursor solution during initial stages of MHP deposition as well as the onset of MHP crystallisation. As examples, the role of the anti-solvent drip in thin film formation, inhomogeneous crystallisation of MHP materials from mixed bromide/iodide precursors, crystallisation of reduced dimensional 2D/3D materials and effect of spin-coating and annealing time on MHP device performance will be discussed.