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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Poster III

CPP 28.31: Poster

Wednesday, March 20, 2024, 11:30–13:30, Poster C

Influence of Particle Size on the Formation of Solid Solutions Between MAPbI3 and MAPbBr3 — •Tobias Siegert¹, Fatemeh Haddadi Barzoki², Markus Griesbach¹, Christopher Greve³, Ralf Moos⁴, Eva M. Herzig³, Anna Köhler¹, and Helen Grüninger^2,5 — ¹Soft Matter Optoelectronics — ²Inorganic Chemistry III — ³Herzig Group - Dynamics and Structure Formation — ⁴Department of Functional Materials — ⁵Bavarian Center for Battery Technology (BayBatt), all University of Bayreuth, 95447 Bayreuth, Germany

Mixed halide perovskites, e.g., MAPbI3-xBrx, have emerged as promising candidates to be used as wide-bandgap absorbing layers in tandem solar cell applications due to their tunability of bandgap energy. However, pronounced halide migration, which leads to a severe drop in performance, is still hindering a commercialization. To analyze the halide kinetics, we investigate the thermally driven formation of a solid solution, i.e., halide mixing, between MAPbI3 and MAPbBr3 as a function of the morphology of the perovskite powder. Here, the surface to bulk ratio of the parent powder particles is varied by systematically changing particle sizes.

Keywords: perovskite; halide mixing; powder