Interplay Between Cr Dopants and Vacancy Clustering in the Structural and Optical Properties of WSe.

Here, we analyze the effect of Cr doping on WSe crystals. The topology and the chemistry of the doped samples have been investigated by atom-resolved scanning transmission electron microscopy combined with electron energy loss spectroscopy. Cr (measured to have formal valence 3+) occupies W sites (formal valence 4+), indicating a possible hole doping.