Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Silver phenylselenolate (AgSePh) is an emerging excitonic two-dimensional semiconducting member of a hybrid metal-organic chalcogenolate family. In addition to its two-dimensional structure with high exciton binding energy, strong in-plane anisotropy, and a narrow emission spectrum at 467 nm, AgSePh does not contain any toxic element and is tolerant to both polar and non-polar solvents. AgSePh can be synthesized by a solution-phase reaction as well as a scalable vapor-phase method. Here, we show by testing 24 solvents – with different polarities, boiling points and functional groups – that complexation between silver cations and solvent molecules is the key to an increasing size of AgSePh crystals. With the introduction of amine solvents, we are able to increase the size of AgSePh crystals grown by the solution-phase biphasic reaction from ~3 µm to >200 µm and that of AgSePh thin films prepared by the vapor-phase tarnish reaction from ~200 nm to >1 µm. We also observed that the photoluminescence lifetime of AgSePh is stable after storing under ambient condition and the addition of amines boosts this lifetime from <40 ps to 200 ps. The improved syntheses reported in this work will allow easy integrations of AgSePh in both thin-film electronic and nanoelectronic applications as well as the exploration of strong excitonic anisotropy.
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