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HL: Fachverband Halbleiterphysik
HL 45: Perovskite and Photovoltaics: Spectroscopy
HL 45.7: Vortrag
Donnerstag, 12. März 2026, 16:45–17:00, POT/0006
Dynamic Screening Effects on Auger Recombination in Metal-Halide Perovskites from First Principles — •Utkarsh Singh — Theoretical Physics Division, IFM, Linköping University, Sweden
Auger recombination is the dominant nonradiative loss in perovskite LEDs and nanolasers at carrier densities >1017 cm−3.[1,2] Conventional first-principles treatments[3] use static dielectric screening W(q,0) and neglect its frequency dependence in polar iodide perovskites.
I present a framework that incorporates the frequency-dependent screened interaction W00(q,ω), computed from low-scaling GW, into direct and phonon-assisted Auger amplitudes.[4] For γ-CsPbI3 and γ-CsSnI3, dynamic screening enhances the dielectric response at optical energies and reduces the room-temperature Auger coefficient by 50–60% compared with the static approximation.[5] The critical crossover density is shifted by a factor of 2, with implications for efficiency roll-off and lasing thresholds in optoelectronic devices.
These results establish dynamic screening as a quantitative determinant of Auger losses in polar semiconductors and provide a transferable framework for device modeling.
[1] J. Qin et al., Trends Chem. 3 (2021). [2] Y. Sun et al., Appl. Phys. Rev. 11 (2024). [3] E. Kioupakis et al., Phys. Rev. B 92 (2015). [4] F. Yuan et al., Nat. Photonics 18 (2024). [5] U. Singh & S. I. Simak, in preparation (2025).
Keywords: Auger; Perovskite; EQE; Many-body methods; GW