Patent ID: 8902640
Filing Date: 2014-12-02
Classification: G11C,H01L

Abstract:
1. A semiconductor device comprising: a first transistor over a substrate, the first transistor comprises a source region, a drain region, a channel formation region, a first gate insulating layer and a first gate electrode; a first insulating layer covering the first transistor; and a second transistor over the first insulating layer, the second transistor comprising an island-like oxide semiconductor layer, a source electrode and a drain electrode in contact with the island-like oxide semiconductor layer, a second gate insulating layer over the island-like oxide semiconductor layer and a second gate electrode over the second gate insulating layer, wherein the first transistor is a p-channel transistor and the second transistor is an re-channel transistor, wherein the first gate electrode is exposed from the first insulating layer and in direct contact with one of the source electrode and the drain electrode of the second transistor, and wherein the other of the source electrode and the drain electrode of the second transistor is connected to one of the source region and the drain region of the first transistor via the first insulating layer.