Patent ID: 9196534
Filing Date: 2015-11-24
Classification: H01L

Abstract:
1. A method for preparing semiconductor devices applied in a flip chip packaging process comprising: depositing a first plastic chip package layer at a front surface of a semiconductor wafer including a plurality of semiconductor chips on the front surface, wherein a radius of the first plastic chip package layer is smaller than that of the semiconductor wafer thus forming a first ring area not covered by the first plastic chip package layer at an edge of the front surface of the semiconductor wafer; cutting the first plastic chip package layer to a first depth shallower than a thickness of the first plastic chip package layer along each scribe line on the front surface of the semiconductor wafer using two ends of each scribe line exposed in the first ring area as reference to form a plurality of reference lines; flipping the semiconductor wafer and grinding the semiconductor wafer from a back surface opposite to the front surface; depositing a metal layer at the back surface of the semiconductor wafer after grinding; mounting the wafer with the metal layer formed at the back surface of the thinned wafer attaching on a first adhesive film; cutting the first plastic chip package layer, the semiconductor wafer and the metal layer along the reference lines to form a plurality of semiconductor devices, wherein each semiconductor device comprises a semiconductor chip with a top plastic chip package layer formed by cutting the first plastic chip package layer at its front surface and a bottom metal layer formed by cutting the metal layer at its back surface; flipping the semiconductor devices attached on the first adhesive film and attaching the top plastic chip package layer on a second adhesive film; removing the first adhesive film attached on the bottom metal layer; and picking up the semiconductor device and attaching the semiconductor device on a substrate without flipping the semiconductor device.