This research investigates the electronic properties of Mercury Telluride (HgTe) Quantum Dots(QDs), a material of growing interest for infrared optoelectronic applications, particularly as an ac-tive layer in photodetectors. The primary characterization technique used is X-ray PhotoemissionSpectroscopy (XPS), which allows to probe the occupied electronic states of the surface. A first key focus is the effect of cesium (Cs) deposition on the QD surface. Building on prior studies showing that alkali metals can lower the work function of semiconductors and metals, we demonstrate a strong increase in the Cs 3d core level signal after successive depositions, confirming the effectiveness of the progressive deposition process.