Trench capacitors and methods of forming the same

US9508790B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventors

• Thomas Popp · Rockenhausen, DE
• Stefan Pompl · Landshut, DE
• Rudolf Berger · Munich, DE

Key dates

• Filing date: May 28, 2015
• Grant date: Nov 29, 2016
• Expiry date: May 28, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10D84/212

Abstract

A method of forming a semiconductor device includes forming an opening having a sidewall in a substrate and forming a first epitaxial layer in the opening. The first epitaxial layer is formed in a first portion of the sidewall without growing in a second portion of the sidewall. A second epitaxial layer is formed in the opening after forming the first epitaxial layer. The second epitaxial layer is formed in the second portion of the sidewall. The first epitaxial layer is removed after forming the second epitaxial layer.