Time resolved infrared spectroscopy for hot carrier dynamics in InAs-AlAsSb core-shell nanowires

Daniel Sandner; Hamidreza Esmaielpour; Fabio del Giudice; Matthias Nuber; Reinhard Kienberger; Gregor Koblmüller; Hristo Iglev

doi:10.1117/12.2648285

10 March 2023 Time resolved infrared spectroscopy for hot carrier dynamics in InAs-AlAsSb core-shell nanowires

Daniel Sandner, Hamidreza Esmaielpour, Fabio del Giudice, Matthias Nuber, Reinhard Kienberger, Gregor Koblmüller, Hristo Iglev

Author Affiliations +

Proceedings Volume 12416, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XII; 1241605 (2023) https://doi.org/10.1117/12.2648285
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Semiconductor nanowires (NWs) have shown robust hot carrier effects due to their small dimensions. Here, we study the cooling mechanisms of hot electrons in the time domain via transient absorption spectroscopy. Probe energies below the bandgap are used to determine the evolution of the carrier effective mass while probe energies above the bandgap track the conduction band occupation. From excitation intensity dependent measurements, we confirm that electron-hole interactions are a major cooling channel at large carrier density, given the high ratio of m_h/m_e of InAs. Our experiments indicate that this cooling channel is amplified in passivated core-shell NWs. We associate this effect with spatial carrier separation caused by Fermi-level pinning in unpassivated NWs. In core-shell NWs, bands are considerably more flat which increases radiative recombination and electron-hole scattering with the latter cooling the hot electron population. Our results highlight the advantages of carrier separation if high carrier densities are to be used for hot phonon bottlenecks.

Conference Presentation

Citation Download Citation

Daniel Sandner, Hamidreza Esmaielpour, Fabio del Giudice, Matthias Nuber, Reinhard Kienberger, Gregor Koblmüller, and Hristo Iglev "Time resolved infrared spectroscopy for hot carrier dynamics in InAs-AlAsSb core-shell nanowires", Proc. SPIE 12416, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XII, 1241605 (10 March 2023); https://doi.org/10.1117/12.2648285

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