Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Poster I

HL 13.36: Poster

Montag, 18. März 2024, 15:00–18:00, Poster E

Temperature-induced limitation of charge carrier mobility in perovskite absorbers and its influence on recombination — •Patrick Dörflinger, Philipp Rieder, and Vladimir Dyakonov — Experimental Physics 6, Julius-Maximilians-Universität Würzburg, 97074 Würzburg, Germany

The charge carrier mobility µ is a crucial parameter in semiconductors. Together with the lifetime, it quantifies the diffusion length of the charge carriers. Moreover, its temperature-dependent power-law µ ∝ T^−γ provides information about the predominant scattering mechanism that limits mobility at a certain temperature. For lead-halide perovskites γ values of ≈ 1.5−3 are observed at room temperature, which are related to pronounced displacements of the lead-halogen bonds due to the rather mechanically soft lattice.^[1] More importantly, this scattering mechanism dominates at elevated temperatures and severely restrics charge carrier mobility, an effect relevant for photovoltaic applications.

For this reason, we systematically investigated the charge carrier decay, mobility, and power-law behavior between 80K and 360K using time-resolved microwave conductivity (TRMC). We find a correlation between the scattering mechanism and the recombination behavior of the charge carriers in methylammonium lead triiodide. Furthermore, by substitution of the A-site cation and halide anion we quantify the predominant scattering mechanism of different organic/inorganic lead halide perovskites, which exhibit different temperature dependencies.

[1] Dörflinger et al., Adv. Sci. 2023, 2304502.

Keywords: perovskite; mobility; scattering mechanisms; microwave conductivity