Bonding wires to quantized Hall resistors

Three different techniques for attaching wires to quantized Hall resistors with gold-germanium-nickel (AuGe/Ni) alloyed contacts were evaluated. The best quality and most robust samples were made by evaporating bonding pads that overlapped the alloyed contacts and the substrate, so that bonds could be made over the substrate rather than over the heterostructure.<
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