Samsung Electronics Co., Ltd.

Jin-Sung Chung

Dong-Jo Kang

Dae-Keun Park

Hyoung-Jun Kim

Provided is a semiconductor device having a backside illuminated image sensor and a method of forming same. The method includes providing a first substrate and a second substrate, forming metal interconnections on a first surface of the first substrate, forming a filling insulating layer filling spaces between sides of the metal interconnections and covering upper surfaces of the metal interconnections, forming a buffer insulating layer softer than the filling insulating layer on the filling insulating layer, forming a capping insulating layer denser than the buffer insulating layer on the buffer insulating layer, and bonding a surface of the capping insulating layer to a surface of the second substrate.

Method of fabricating a semiconductor device

A metal interconnection for an integrated circuit device is fabricated by forming a trench in an integrated circuit substrate and a via hole beneath a portion of the trench. The trench includes a trench sidewall and the via hole includes a sacrificial film therein. A buffer layer is formed on the trench sidewall. At least some of the sacrificial film is removed from the via hole by etching the sacrificial film through the trench that includes the buffer layer on the trench sidewall. The metal interconnection is formed in the via hole from which at least some of the sacrificial film has been removed, and in the trench. The buffer layer may use material having etch selectivity to an etchant which is used when removing the sacrificial film, to thereby protect the trench sidewall when removing the sacrificial film.

Growing community of inventors

Gyeonggi-do, South Korea

Jin-Sung Chung