1. A switching device, comprising: a substrate having a surface region; a first dielectric material overlying the surface region of the substrate; a bottom wiring structure overlying the first dielectric material; a first structure comprising at least a contact material overlying the bottom wiring structure and a switching material overlying the contact layer, the first structure having a top surface region and a side region, top surface region including a top region of the switching material; a second dielectric layer overlying the first structure; a side wall spacer structure formed in an opening region of the second dielectric layer, the opening region comprising a portion of the top surface region of the switching material, the side wall spacer structure being formed using a third dielectric material; a conductive material overlying the opening region, the conductive material being in contact with the switching material; and a top wiring structure overlying the conductive material.