Abstract

We report a differential scanning photocapacitance microscopy technique based on the detection of light-induced capacitance changes allowing mapping of metal interconnection line defects in through-silicon-via (TSV) structures used in three-dimensional (3-D) integration technology. Due to the photosensitive silicon depletion capacitance, observation of the photocapacitance response enables non-destructive two-dimensional (2-D) visualization of metallization line ruptures in TSV structures. We demonstrate the application of the proposed method on a TSV chain structure and reveal the location of the open metallization rupture.

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