Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Poster I

HL 13.24: Poster

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

Single molecule spectroscopy of emitters in hexagonal boron nitride — •Osama Farooqui and Klas Lindfors — Department of chemistry, University of Cologne, Greinstr.4-6, D-50939, Cologne, Germany

The interaction of light with atoms or molecules is indispensable in the examination of materials for potential use in the development of high-speed communication devices [1]. The primary objective of this project is to observe light emission and absorption within heterostructures comprised of two- and one-dimensional materials, as well as single emitter molecules.

Previously, investigations were conducted on individual triisopropylsilyl pentacene (TIPS-pentacene) molecules on a glass substrate using single molecule spectroscopy. To address the challenge of molecular stability, hexagonal Boron Nitride (hBN) is employed to encapsulate emitter molecules, thereby preventing chemical reactions with the surrounding environment. Initial data from time traces of TIPS-pentacene molecules encapsulated in hBN flakes indicate that these molecules do not undergo photobleaching over a one-hour period at room temperature. However, rapid photoblinking is observed in the time traces of the molecules. The cause of this fast photoblinking is speculated to be the interaction of the molecules with nearby two-level systems, potentially associated with hBN flakes.

Reference

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

Keywords: single photon source; single molecule spectroscopy; hexagonal Boron Nitride(hBN); 2D materials; Blinking