Patent ID: 6998638
Filing Date: 2006-02-14
Classification: H01L

Abstract:
1. In an integrated circuit, the improvement comprising a crack detection structure having: a control structure having interleaved electrically conductive layers and non electrically conductive layers in a vertical orientation, with electrically conductive vias disposed vertically through all the non electrically conductive layers and electrically connecting all of the electrically conductive layers one to another, where none of the electrically conductive layers of the control structure are electrically connected to any other structure besides the control structure, and all but one of the electrically conductive layers of the control structure do not extend outside of straight, vertical boundaries of the control structure, a test structure having a bonding pad for probing and bonding, the bonding pad including a lower electrically conductive layer, an upper capping layer, and a diffusion boundary layer disposed between the lower electrically conductive layer and the upper capping layer, and interleaved electrically conductive layers and non electrically conductive layers underlying the bonding pad in a vertical orientation, where at least one of the non electrically conductive layers has no vias formed in a region of the test structure, simulating active circuitry under other bonding pads of integrated circuit, where none of the electrically conductive layers of the test structure are electrically connected to any other structures besides the test structure, and none of the electrically conductive layers of the test structure extend outside of straight, vertical boundaries of the test structure, and the boundaries of the control structure and the test structure are mutually exclusive, and one of the interleaved electrically conductive layers of the control structure extends from within the control structure to within the test structure as a sensing layer, which is considered to be part of the control structure and not part of the test structure as claimed herein, where the sensing layer immediately underlies the at least one of the non electrically conductive layers in the test structure that has no vias formed therein, such that a crack in the at least one of the non electrically conductive layers in the test structure that has no vias formed therein is detectable as a leakage current between the bonding pad of the test structure and a top most electrically conductive layer of the control structure.