Contribution to the papers in this thesis are: I Characterization of WS2 monolayer by low temperature photoluminescence and Raman spectroscopy, analysis of the results, and minor part of the writing II Chemical vapor deposition of MoS2 monolayer, characterization of the monolayer by photoluminescence and Raman spectroscopy, analysis of the results, and major part of the writing III Chemical vapor deposition of WS2 monolayer, part of characterization of the monolayer by photoluminescence and

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