Why does Bi occupying Se lattice site in Bi2Se3 contribute p-type charge carriers to the system?

References: 1. https://doi.org/10.1016/S0022-0248(97)00108-5 (1997) 2. Journal of Solid State Chemistry 165, 35-41, doi:https://doi.org/10.1006/jssc.2001.9486 (2002) These are important...

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