Patent ID: 8552545

Claim:
A semiconductor device, comprising: a first semiconductor chip, which has a first front surface and a first rear surface, and is provided with a first semiconductor substrate, a first functional element formed on the first front surface side of the first semiconductor substrate, and a first feedthrough electrode which is placed within a first through hole that penetrates the first semiconductor substrate in a direction of a first thickness thereof and which is electrically connected to the first functional element, wherein the first semiconductor chip further comprises a rear surface side connection member which is electrically connected to the first feedthrough electrode and which has a joining surface within a recess that is formed in the first rear surface, and a rear surface protective film on the first rear surface side, covering at least part of the rear surface side connection member, wherein the recess includes an opening in the rear surface protective film, wherein the rear surface side connection member includes a first portion exposed though the opening formed in the rear surface protective film to provide the joining surface, and a second portion which extends laterally along the first rear surface side of the first semiconductor substrate and is connected to the first feedthrough electrode, and which is covered by the rear surface protective film; a second semiconductor chip, which has a second front surface and a second rear surface, and is provided with a second semiconductor substrate, a second functional element formed on the second front surface side of the second semiconductor substrate, and a second feedthrough electrode which is placed within a second through hole that penetrates the second semiconductor substrate in a direction of a second thickness thereof and which is electrically connected to the second functional element, wherein the second semiconductor chip further comprises a front surface side connection member which protrudes from the second front surface and a device connection member which is provided between a bottom of the recess that is formed in the first rear surface of the first semiconductor chip and the second front surface of the second semiconductor chip in a manner that a gap within the recess is formed at least partially between an inner wall surface of the recess and the front surface side connection member and that electrically connects the first feedthrough electrode of the first semiconductor chip to the second feedthrough electrode of the second semiconductor chip through the rear surface side connection member, the bottom of the recess located deeper in the first semiconductor chip than the first rear surface of the first semiconductor chip in said direction of a first thickness of the first semiconductor substrate; and an external connection member of the semiconductor device, which is electrically connected to the first and second semiconductor chips.