Recently, it was shown that the usual statistical-mechanical formulation used to fit carrier concentration versus temperature data cannot distinguish between the donor or acceptor nature of one single-charge-state center. Here we generalize that result to include any number of donor and acceptor centers, of arbitrary charge multiplicity, and also show how that by fitting one particular case (e.g., every center assumed to be a donor), all of the other possible cases can be immediately solved by inspection.
Look, D. C.
(1987). Equivalence of Donor and Acceptor Fits To Temperature-Dependent Hall Data: General Case. Journal of Applied Physics, 62 (9), 3998-3999.