21 May 2018 Effect of size confinement in C exciton dynamics of few-layered MoS2 nano-sheets
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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.
Conference Presentation
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Manobina Karmakar, Manobina Karmakar, Sayantan Bhattacharya, Sayantan Bhattacharya, Subhrajit Mukherjee, Subhrajit Mukherjee, Rup Kumar Chowdhury, Rup Kumar Chowdhury, Samit K. Ray, Samit K. Ray, Prasanta Kumar Datta, 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); doi: 10.1117/12.2307491; https://doi.org/10.1117/12.2307491

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