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applications by improving the power factor via band engineering. It can be doped either n-type or p-type with appropriate dopants. Halogens are often used as n-type doping agents. PbCl₂, PbBr₂ and PbI₂ are commonly used to produce donor centers. Other n-type doping agents such as Bi₂Te₃, TaTe₂, MnTe₂, will substitute for Pb and create uncharged vacant Pb-sites. These vacant sites are subsequently filled by atoms from the lead excess and the valence electrons of these

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