Patent ID: 7592827

Claim:
A method for testing a test structure for an electrical short, the method comprising: testing a comb pair for electrical continuity, the comb pair comprising a first comb-shaped structure having a first busbar and a first plurality of fingers extending form the first busbar and a second comb-shaped structure having a second busbar and a second plurality of fingers extending from the second busbar, the first plurality of fingers being interleaved with the second plurality of fingers, the testing determining whether a short exists between the first comb-shaped structure and the second comb-shaped structure while the first plurality of fingers are electrically connected to the first busbar and the second plurality of fingers are electrically connected to the second busbar; localizing the short by electrically disconnecting the first plurality of fingers from the first busbar and imaging the test structure using voltage contrast to identify which of the first plurality of fingers is placed at the same voltage as the second comb-shaped structure as a result of the short.