Effect of size confinement in C exciton dynamics of few-layered MoS2 nano-sheets

Manobina Karmakar; Sayantan Bhattacharya; Subhrajit Mukherjee; Rup Kumar Chowdhury; Samit K. Ray; Prasanta Kumar Datta

doi:10.1117/12.2307491

21 May 2018 Effect of size confinement in C exciton dynamics of few-layered MoS₂ nano-sheets

Manobina Karmakar, Sayantan Bhattacharya, Subhrajit Mukherjee, Rup Kumar Chowdhury, Samit K. Ray, Prasanta Kumar Datta

Proceedings Volume 10673, Advances in Ultrafast Condensed Phase Physics; 1067307 (2018) https://doi.org/10.1117/12.2307491
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

We study transient absorption response of few-layered MoS₂ nano-flakes in dispersion, mainly focusing on its high energy exciton (commonly known as C exciton). We use a simple sono-chemical exfoliation technique to obtain confined nano-crystals of MoS₂ of average diameter 2 nm, inter-dispersed in the flakes and study the effect of quantum confinement on this layered semiconductor. We emphasize on the interplay between exciton bleaching and excited state absorption upon a blue-detuned pumping. The relaxation times for the exciton are found and for the nano-crystals the radiative relaxation process is found to be slower as compared to that of the nano-flakes.

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Manobina Karmakar, Sayantan Bhattacharya, Subhrajit Mukherjee, Rup Kumar Chowdhury, Samit K. Ray, and Prasanta Kumar Datta "Effect of size confinement in C exciton dynamics of few-layered MoS₂ nano-sheets", Proc. SPIE 10673, Advances in Ultrafast Condensed Phase Physics, 1067307 (21 May 2018); https://doi.org/10.1117/12.2307491

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