| 摘要 |
A semiconductor device is made by providing a semiconductor wafer having an active surface, forming an under bump metallization layer on the active surface of the semiconductor wafer, forming a first photosensitive layer on the active surface of the semiconductor wafer, exposing a selected portion of the first photosensitive layer over the under bump metallization layer to light, removing a portion of a backside of the semiconductor wafer, opposite to the active surface, prior to developing the exposed portion of the first photosensitive layer, developing the exposed portion of the first photosensitive layer after removing the portion of the backside of the semiconductor wafer, and depositing solder material over the under bump metallization layer to form solder bumps. The remaining portion of the first photosensitive layer is then removed. A second photosensitive layer or metal stencil can be formed over the first photosensitive layer.
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