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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Poster III

CPP 28.40: Poster

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

Influence of additives on the recombination dynamics in lead-halide perovskite absorbers probed by TRMC and SSMC — •Mechthild Seidl¹, Patrick Dörflinger¹, Mohammad Khaja Nazeeruddin², and Vladimir Dyakonov¹ — ¹Experimental Physics 6, Julius-Maximilians-Universität Würzburg, 97074 Würzburg, Germany — ²Group of Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL Valais, Sion 1950, Switzerland

Perovskites have attracted attention due to the possibility of using them as a top cell with a wide bandgap in tandem solar cells. However, a significant challenge associated with perovskites is their instability. One promising approach to enhance their performance and stability involves the incorporation of additives. Two contactless measurement techniques, time-resolved microwave conductivity (TRMC) and steady-state microwave conductivity (SSMC) are used to characterize and understand the influence of the additives. Both techniques uses the interaction of light-induced charge carriers with an electromagnetic field inside a cavity to measure a change in conductance. SSMC provides insight into the dominant charge carrier recombination pathway, while TRMC is employed to determine the mobility and lifetime of generated charge carriers in the perovskite. An understanding of the influence of the additives on these optical properties is essential to improve the solar cell’s performance further.

Keywords: Perovskite; Charge carrier recombination; Microwave conductivity; Stability