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Author

Husna Amini

Bio: Husna Amini is an academic researcher. The author has co-authored 1 publications.

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Proceedings ArticleDOI
28 Aug 2022
TL;DR: In this article , the authors used time-resolved THz spectroscopy to investigate ultrafast carrier dynamics in Germanium sulfide (GeS) single crystals as well as in GeS nanoribbons.
Abstract: Germanium sulfide (GeS) is a 2D semiconductor with high carrier mobility and a moderate band gap of about 1.5 eV, which holds promise for high-speed optoelectronics and photovoltaics. We use time-resolved THz spectroscopy to investigate ultrafast carrier dynamics in in GeS single crystals as well as in GeS nanoribbons. In both bulk and nanostructured GeS, we find that near gap excitation at 1.55 eV results in much longer lived photocarriers compared to 3.1 eV excitation. We also explore how intercalation of small molecules influences the photoexcited carrier dynamics in GeS. We find that presence of edge states in nanoribbons results in decreased carrier lifetime. Organic molecules such as octylamine, which do not form chemical bonds with the host GeS layers, increase photoexcited carrier lifetime. These findings demonstrate the possibility of engineering the properties of 2D materials by intercalation.