Figure 2. The electronic band structure of (a) PbS, (b) PbSe, and (c) PbTe Crystals along with high symmetry direction in the Brillouin zones

From

The Substantive Characteristics of Layered PbX (X=S, Se, and Te) Compounds: An ab-inito Investigations

Humaira Takia, Md. Afjalur Rahman, Rahman Moshiur, M.M. Rahaman, Khokon Hossen

International Journal of Physics. 2022, 10(2), 102-110 doi:10.12691/ijp-10-2-3