Constructed within the framework of the Schwinger--DeWitt method, the renormalized stress-energy tensor of the quantized massive scalar, spinor and vector fields in a general spherically-symmetric and static spacetime is employed as a source term of the Einstein field equations. The semiclassical solutions describing the electrically charged black holes are obtained and their properties are studied. Special emphasis is put on the semiclassical extremal configurations: it is shown that the near-horizon geometry, when expanded into a whole manifold, is described by the Bertotti--Robinson line element.

PACS numbers: 04.62.+v, 04.70.Dy