Single Step Pattern Transfer to Superconducting Oxides and Resist Removal
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-29
Figure 1 shows a superconducting oxide (for example, (YBa2Cu3Ox) with a layer of organic resist patterned on top. The carbonaceous resist has a very low sputtering rate and serves as an etch mask when the structure is ion milled with, for example, argon ions. The superconducting oxide has a much higher sputtering rate (comparable to Au) and the uncovered material is removed much faster than the resist etch mask. Oxygen released by the milling of the superconducting oxide reacts with the carbon in the resist and removes the resist via an ashing process, shown in Figure 2. The resist thickness is chosen so that the resist is removed by ashing just prior to completely milling through the uncovered superconducting oxide, leaving a clean surface for further processing.