Patent ID: 9647138
Date: 2017-05-09
CPC Classifications: H01L

Claim:
1. A metal oxide semiconductor transistor, comprising: a gate; a metal oxide active layer, having a first surface and a second surface on two opposite sides of the metal oxide active layer, the first surface facing to the gate; a gate insulating layer, disposed between the gate and the metal oxide active layer; a source, connected to the metal oxide active layer; and a drain, connected to the metal oxide active layer; wherein the metal oxide active layer comprises a mobility enhancing region between the source and the drain, and an oxygen content of the metal oxide active layer in the mobility enhancing region is less than an oxygen content of the metal oxide active layer in a region outside the mobility enhancing region; wherein the metal oxide semiconductor transistor further comprises a mobility enhancing layer disposed on the second surface of the metal oxide active layer, and the mobility enhancing layer is located above the mobility enhancing region and wider than the mobility enhancing region, wherein the metal oxide semiconductor transistor further comprises an insulated protecting layer covering the source, the drain, and the metal oxide active layer, wherein the mobility enhancing layer is spatially separated from the source and the drain by the insulated protecting layer and is uncontacted with the source and the drain, wherein a material of the mobility enhancing layer comprises an ionic compound capable of bonding with oxygen, and the ionic compound is lithium aluminum hydride.