发明名称 |
Non-volatile memory device with undercut ONO trapping structure and manufacturing method thereof |
摘要 |
A method for manufacturing a non-volatile memory structure includes providing a substrate having a gate structure, performing a first oxidation process to form a first SiO layer at least covering a bottom corner of the conductive layer, performing a first etching process to remove the first SiO layer and a portion of the dielectric layer to form a cavity, performing a second oxidation process to form a second SiO layer covering sidewalls of the cavity and a third SiO layer covering a surface of the substrate, forming a first SiN layer filling in the cavity and covering the gate structure on the substrate, and removing a portion of the first SiN layer to form a SiN structure including a foot portion filling in the cavity and an erection portion upwardly extended from the foot portion, and the erection portion covering sidewalls of the gate structure. |
申请公布号 |
US9331185(B2) |
申请公布日期 |
2016.05.03 |
申请号 |
US201414505513 |
申请日期 |
2014.10.03 |
申请人 |
UNITED MICROELECTRONICS CORP. |
发明人 |
Huang Ya-Huei;Wang Shen-De;Chang Wen-Chung;Tsai Feng-Ji;Chen Chien-Hung |
分类号 |
H01L21/336;H01L29/792;H01L29/66;H01L21/28;H01L29/423;H01L29/51 |
主分类号 |
H01L21/336 |
代理机构 |
|
代理人 |
Hsu Winston;Margo Scott |
主权项 |
1. A method for manufacturing a non-volatile memory structure, comprising:
providing a substrate having a gate structure formed thereon, the gate structure comprising a conductive layer and a dielectric layer; performing a first oxidation process to form a first silicon oxide (SiO) layer at least covering a bottom corner of the conductive layer; performing a first etching process to remove the first SiO layer and a portion of the dielectric layer to form a cavity under the conductive layer; performing a second oxidation process to form a second SiO layer covering sidewalls of the cavity and a third SiO layer covering a surface of the substrate; forming a first silicon nitride (SiN) layer on the substrate, the first SiN layer filling in the cavity and covering the gate structure; and removing a portion of the first SiN layer to form a SiN structure comprising a foot portion filling in the cavity and an erection portion upwardly extended from the foot portion, and the erection portion covering sidewalls of the gate structure. |
地址 |
Hsin-Chu TW |