Our MoSe2 crystals are grown using two different techniques through chemical vapor transport (CVT) or flux zone growth (see description of these two methods below). These crystals are treated as gold standards in 2D materials field owing to perfected optical and electronic behavior. Our MoSe2 crystals are notoriously known to possess extremely narrow PL bandwidths, display clean PL spectra, no bound exciton shoulders at low temperatures, high carrier mobility, extremely clean and sharp XRD peaks, and negligible amount of defects (see published results as well as CVT vs. Flux based methods below ). These are the only commercially available MoSe2 crystals with guaranteed valleytronic response, sharp PL, and good electronic response.