Conditions under which, poly(pyrrole) (PP) films form ohmic contact with single‐crystal p‐Si are described. Counterions affect both the conductivity and flatband potential ( V FB ) values of poly(pyrrole). While paratoluene‐sulfonate‐doped PP acts like a switch, the impedance behavior of PP films doped with ClO 4 − , BF 4 − , or PF 6 − allows evaluation of the V FB of these films. The formation of “quasi‐ohmic” and “non‐ohmic” contacts respectively of PP ( ClO 4 ) and PP films doped with other counterions, with p‐Si, are explained in terms of conductivity of these films and V FB of PP films with respect to that of p‐Si. PP film seems to passivate or block intrinsic surface states present on p‐Si surface.
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Nagasubramanian et al. (1986) studied this question.