The electrical resistivity of thin polycrystalline pyrite films was investigated at 300 to 615K. Curved Arrhenius-type plots were attributed to a high density of acceptor states that was created by interacting Fe vacancies; partially compensated by S vacancies. The mean energy value of the narrow band created by the Fe vacancies was about 0.11eV, and its standard deviation was about 0.05eV.

Lattice Intrinsic Defects and Electrical Resistivity in Pyrite Thin Films. J.R.Ares, A.Pascual, I.J.Ferrer, C.R.Sánchez: Thin Solid Films, 2004, 451-452, 233-6