Non-volatile memory (NVM) and high-k and metal gate integration using gate-first methodology

摘要

A method of making a semiconductor structure includes forming a select gate over a substrate in an NVM portion and a first protection layer over a logic portion. A control gate and a storage layer are formed over the substrate in the NVM portion, wherein the control and select gates have coplanar top surfaces. The charge storage layer is under the control gate, along adjacent sidewalls of the select gate and control gate, and is partially over the top surface of the select gate. A second protection layer is formed over the NVM portion and the logic portion. The second protection layer and the first protection layer are removed from the logic portion leaving a portion of the second protection layer over the control gate and the select gate. A gate structure is formed over the logic portion comprising a high k dielectric and a metal gate.