I'm working on absorption enhancement in Multiayers with nanomaterials. I want to know which monolayer structure is better for more light absorption? MoS2 or WS2?
I would say that it depends on which wavelength of light you need to absorb. WS2 has a sharp absorption peak centered around 620 nm corresponding to the A exciton, while MoS2 has two peaks around 670 and 600 nm, corresponding to the A and B excitons, respectively. WS2 has a higher absoprtion near the A exciton, but MoS2 has a broader absorption curve due to the excitonic transitions. A combination of the two might not be a bad idea depending on what you need. You can check the papers below for the measurements
[1] Chunwei Hsu, Riccardo Frisenda, Robert Schmidt, Ashish Arora, Steffen Michaelis de Vasconcellos, Rudolf Bratschitsch, Herre S.J. van der Zant, and Andres Castellanos-Gomez, Thickness-Dependent Refractive Index of 1L, 2L, and 3L MoS 2 , MoSe 2 , WS 2 , and WSe 2, Adv. Opt. Mater. 1900239, (2019) , 10.1002/adom.201900239.
[2] Yue Niu, Sergio Gonzalez-Abad, Riccardo Frisenda, Philipp Marauhn, Matthias Drüppel, Patricia Gant, Robert Schmidt, Najme Taghavi, David Barcons, Aday Molina-Mendoza, Steffen de Vasconcellos, Rudolf Bratschitsch, David Perez De Lara, Michael Rohlfing, and Andres Castellanos-Gomez, Thickness-Dependent Differential Reflectance Spectra of Monolayer and Few-Layer MoS2, MoSe2, WS2 and WSe2, Nanomaterials 8, 725 (2018) , 10.3390/nano8090725.
[3] Riccardo Frisenda, Yue Niu, Patricia Gant, Aday J Molina-Mendoza, Robert Schmidt, Rudolf Bratschitsch, Jinxin Liu, Lei Fu, Dumitru Dumcenco, Andras Kis, David Perez De Lara, and Andres Castellanos-Gomez, Micro-Reflectance and Transmittance Spectroscopy: A Versatile and Powerful Tool to Characterize 2D Materials, J. Phys. D. Appl. Phys. 50, 074002 (2017) , 10.1088/1361-6463/aa5256.
Hope that helps.
The monolayer structure of MoS2 is better for light absorption. MoS2 has a larger band gap and higher light absorption than WS2, which means that more photons will be absorbed and converted into electron-hole pairs when passing through the monolayer. Additionally, MoS2 has a higher extinction coefficient than WS2, meaning it can absorb more light over a greater range of wavelengths.
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