SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.27: Poster

Monday, March 27, 2023, 13:00–15:00, P2/EG

single molecule spectroscopy of emitters in hexagonal boron nitride(hBN) — •osama farooqui and klas lindfors — department of chemistry, university of cologne

Efficient interaction of light with atoms or molecules has been found crucial in the study of materials that can be used in the development of high-speed communication devices [1]. The central goal of this project is to observe and investigate the light emission and absorption processes in heterostructures of two- and one-dimensional materials and single emitter molecules.

Previously, single terrylene diimide (TDI) molecules on glass substrate have been investigated using single molecule spectroscopy. In order to address the problem of stability of the molecules, hBN is used to encapsulate emitter molecules to avoid chemical reactions with the ambient environment. The preliminary data of time traces of triisopropylsilyl pentacene (TIPS-pentacene) molecules encapsulated in hBN flakes shows that the molecules do not get photobleached over 1 hour at room temperature. However, fast photoblinking was observed in the time traces of the molecules. The cause of fast photoblinking could be the interaction of the molecules with close-by two-level systems, which appears to be related to hBN flakes.

Reference [1] Toninelli, C. et al. Single organic molecules for photonic quantum technologies. Nat. Mater. 1-14 (2021).