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Excitonic quasi-particles, excitons/trions/bi-excitons, and their couplingwith phonons and charge carriers play a crucial role in controlling the opticalproperties of atomically thin semiconducting 2D materials. In this work, weunravelled the dynamics of excitons/trions and their coupling with phonons andcharge carriers in a few layers vertically and horizontally aligned MoS2. Weobserved trion signature up to the highest recorded temperature (330 K) in bothsystems and have shown that the dynamics of excitons/trions and their couplingwith phonons and electrons are more affected in vertically aligned MoS2. Ahomogeneous linewidth broadening is observed with an increase in temperature.The linewidth broadening is attributed mainly to acoustic phonons in alow-temperature regime (<100 K). In contrast, acoustic and longitudinal opticalphonons contributions to the linewidth broadening are observed at hightemperature. We also observed the significant effects of interlayer coupling inboth systems via understanding the temperature-dependent valence band splittingand trion binding energy. A decrease of 22 and 12% in valence band splittingwith temperature rise is observed for the vertically and horizontally alignedMoS2, respectively, suggesting that the valence band splitting is affected morein the case of vertically than horizontally aligned. Furthermore, we alsonotice a significant thermal quenching in the intensity of the trion band thanthat of exciton bands, attributed to the small binding energy of the trion.

Unravelling the coupling between excitonic  quasiparticles-electron-phonon and role of interlayer coupling in vertically  and horizontally aligned layered MoS2