Patent ID: 8802545
Filing Date: 2014-08-12
Classification: H01J,H01L,Y10S

Abstract:
1. A method for plasma dicing a substrate, the method comprising: providing the substrate having a top surface and a bottom surface, the top surface having a plurality of device structures and street areas; applying photoresist to the plurality of device structures and the street areas on the top surface of the substrate; patterning the applied photoresist to allow the street areas to be unprotected; placing the bottom surface of the substrate on a carrier support to form a work piece; loading the work piece into a plasma processing chamber; exposing the unprotected street areas on the top surface of the substrate of the work piece in the plasma processing chamber to a first plasma time division multiplex process using a first etchant gas; terminating the first plasma time division multiplex process at a time at which an interface between the bottom surface of the substrate and the carrier support is reached, said time being determined using an endpoint technique; and exposing the work piece in the plasma processing chamber to a second plasma time division multiplex process using a second etchant gas, said exposure of the work piece to the second plasma time division multiplexed process occurring after the termination of the first plasma time division multiplex process and without breaking vacuum from the termination of the first plasma time division multiplex process, said second etchant gas having a different gas composition from said first etchant gas.