SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME

摘要

A metal oxide layer is in contact with an interlayer insulating layer covering a transistor, and has a stacked-layer structure including a first metal oxide layer having an amorphous structure and a second metal oxide layer having a polycrystalline structure. In the first metal oxide layer, there are no crystal grain boundaries, and grid intervals are wide as compared to those in a metal oxide layer in a crystalline state; thus, the first metal oxide layer easily traps moisture between the lattices. In the second metal oxide layer having a polycrystalline structure, crystal parts other than crystal grain boundary portions have dense structures and extremely low moisture permeability. Thus, the structure in which the metal oxide layer including the first metal oxide layer and the second metal oxide layer is in contact with the interlayer insulating layer can effectively prevent moisture permeation into the transistor.

主权项

1. A semiconductor device comprising:
a transistor comprising:
a semiconductor layer;a gate insulating layer adjacent to the semiconductor layer;a gate electrode adjacent to the semiconductor layer with the gate insulating layer interposed therebetween; anda pair of electrodes electrically connected to the semiconductor layer; and a metal oxide layer over the transistor, wherein the metal oxide layer has a stacked-layer structure at least comprising:
a first metal oxide layer having an amorphous structure; anda second metal oxide layer having a polycrystalline structure.