This thesis focus on the integration of TMDC monolayers into monolithic micricavities for (light-matter coupling) exciton-polariton studies. The integration process, and the protection of monolayers for device fabrication are specific difficulties towards the polariton condensation in TMDCs, and these are the major topics studied in this thesis. A unique, PMMA-based cavity was implemented for realisation of polairton formation, and investigated the effect of direct dieletric depositions to TMDC monolayers, and introdcued a novel, protective and passivative dielectric material for TMDC monolayers.<p></p>