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Nonlinear Optical Spectroscopy of Two-Dimensional WSe2 Nanoflakes

Published online by Cambridge University Press:  13 February 2019

Sergey Lavrov Open the ORCID record for Sergey Lavrov [Opens in a new window] ,
Arseniy Buryakov Open the ORCID record for Arseniy Buryakov [Opens in a new window] ,
Elena Mishina ,
Kirill Brekhov ,
Nikita Ilyin ,
Anastasia Shestakova  and
Artur Avdizhiyan
Sergey Lavrov*
Affiliation:
MIREA - Russian Technological University, 78 Vernadsky Avenue, Moscow119454, Russia
Arseniy Buryakov
Affiliation:
MIREA - Russian Technological University, 78 Vernadsky Avenue, Moscow119454, Russia
Elena Mishina
Affiliation:
MIREA - Russian Technological University, 78 Vernadsky Avenue, Moscow119454, Russia
Kirill Brekhov
Affiliation:
MIREA - Russian Technological University, 78 Vernadsky Avenue, Moscow119454, Russia
Nikita Ilyin
Affiliation:
MIREA - Russian Technological University, 78 Vernadsky Avenue, Moscow119454, Russia
Anastasia Shestakova
Affiliation:
MIREA - Russian Technological University, 78 Vernadsky Avenue, Moscow119454, Russia
Artur Avdizhiyan
Affiliation:
MIREA - Russian Technological University, 78 Vernadsky Avenue, Moscow119454, Russia
*
*(Email: [email protected])
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Abstract

Here we present the results of the exciton states study in WSe2 and MoS2 monolayers. Thin WSe2 and MoS2 films obtained by CVD technique were studied by optical methods. The films two-dimensionality and homogeneity were confirmed by the methods of atomic force microscopy and luminescence spectroscopy. The second harmonic generation (SHG) spectroscopy technique was used for the exciton states study at room temperature in the pump photon energy range of 0.8-1.05 eV. The sevenfold SHG intensity resonance amplification was found for the 1.62 eV and 1.87 eV SHG photon energy for the WSe2 and MoS2 films, respectively, that corresponds to the exciton transition energy. These resonance peaks belong to optical A excitons with 1s energy level.

Keywords

2D materialsabsorptionoptical propertiesopticalsemiconducting
Type
Articles
Information
MRS Advances , Volume 4 , Issue 10: Electronic, Photonic and Magnetic Materials , 2019 , pp. 635 - 641
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Copyright
Copyright © Materials Research Society 2019 

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References

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