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

被引：0
|
作者：
Karmakar, Manobina [1 ]
Bhattacharya, Sayantan [1 ]
Mukherjee, Subhrajit [2 ]
Chowdhury, Rup Kumar [1 ]
Ray, Samit K. [1 ,3 ]
Datta, Prasanta Kumar [1 ]
机构：
[1] Indian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India
[2] Indian Inst Technol, Adv Technol Dev Ctr, Kharagpur 721302, W Bengal, India
[3] SN Bose Natl Ctr Basic Sci, Kolkata 700106, India
来源：
ADVANCES IN ULTRAFAST CONDENSED PHASE PHYSICS | 2018年 / 10673卷
关键词：
Transient absorption spectroscopy; MoS2; C exciton; excited state absorption;
D O I：
10.1117/12.2307491
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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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页数：7
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