发明名称 |
Memory transistor with multiple charge storing layers and a high work function gate electrode |
摘要 |
Semiconductor devices including non-volatile memory transistors and methods of fabricating the same to improve performance thereof are provided. In one embodiment, the method comprises: (i) forming an oxide-nitride-oxide (ONO) dielectric stack on a surface of a semiconductor substrate in at least a first region in which a non-volatile memory transistor is to be formed, the ONO dielectric stack including a multi-layer charge storage layer; (ii) forming an oxide layer on the surface of the substrate in a second region in which a metal oxide semiconductor (MOS) logic transistor is to be formed; and (iii) forming a high work function gate electrode on a surface of the ONO dielectric stack. Other embodiments are also disclosed. |
申请公布号 |
US8859374(B1) |
申请公布日期 |
2014.10.14 |
申请号 |
US201113288919 |
申请日期 |
2011.11.03 |
申请人 |
Cypress Semiconductor Corporation |
发明人 |
Polishchuk Igor;Levy Sagy;Ramkumar Krishnaswamy |
分类号 |
H01L21/336 |
主分类号 |
H01L21/336 |
代理机构 |
|
代理人 |
|
主权项 |
1. A method of forming a semiconductor device comprising:
forming an oxide-nitride-oxide (ONO) dielectric stack on a surface of a semiconductor substrate in at least a first region in which a non-volatile memory transistor is to be formed by forming at least a substantially trap free bottom oxynitride layer followed by forming a charge trapping top oxynitride later, wherein the ONO dielectric stack includes a multi-layer charge storage layer; forming an oxide layer on the surface of the substrate in a second region in which a metal oxide semiconductor (MOS) logic transistor is to be formed; and forming a doped polysilicon layer on the surface of a ONO dielectric stack and on a surface of the oxide layer of the MOS logic transistor to form a first high work function gate electrode on the surface of the ONO dielectric stack while concurrently forming a second high work function gate electrode on the oxide layer of the MOS logic transistor. |
地址 |
San Jose CA US |