An n- to p-type conductivity transition induced by oxygen adsorption on α-Fe2O3

Gurlo, A.; Bârsan, N.; Oprea, A.; Sahm, M.; Sahm, T.; Weimar, U.
September 2004
Applied Physics Letters;9/20/2004, Vol. 85 Issue 12, p2280
Academic Journal
The simultaneous measurements of conductance and work function changes induced by gaseous ambient have been performed on α-Fe2O3 thick film polycrystalline samples kept at 280°C and exposed to different gaseous atmospheres. The switching from n- to p-type conductivity on α-Fe2O3 is shown to have an electronic origin, which is due to the oxygen adsorption and formation of a surface inversion layer and, therefore, to the inversion of the surface conduction type. The modeling of the n-p switching is described in terms of conductance dependence on the band bending induced by gaseous ambient.


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