Patent ID: 9564366
Date: 2017-02-07
CPC Classifications: H01J,H01L,Y10S

Claim:
1. A method for plasma dicing a substrate, the method comprising: placing the substrate on a tape on a frame to form a work piece, wherein the substrate comprises at least one device having aluminum contacts, the at least one device is formed on a front side of the substrate and a back side of the substrate is attached to the tape, the front side of the substrate having dicing streets patterned in a masking material; placing the work piece into a plasma processing chamber; exposing the at least one device on the substrate in the plasma processing chamber to a first time division multiplexed etch process until a substrate/tape interface is exposed within the dicing streets, wherein the first time division multiplexed etch process comprises a fluorine based etch chemistry and unwanted AlF detecting the exposed substrate/tape interface by optically monitoring plasma emission; terminating the first time division multiplexed etch process based on the detecting the exposed substrate/tape interface; exposing the at least one device on the substrate in the plasma processing chamber to a second hydrogen based plasma process to remove the unwanted AlF