Patent ID: 8541781

Claim:
A semiconductor device comprising: an oxide semiconductor film comprising a pair of first regions, a pair of second regions, and a third region; a pair of electrodes in contact with the oxide semiconductor film and overlapping with the pair of first regions; a gate insulating film over the oxide semiconductor film; and a gate electrode overlapping with the third region with the gate insulating film interposed therebetween, wherein the pair of second regions are provided between the pair of first regions and the third region, wherein the pair of second regions comprise one or more elements selected from the group consisting of nitrogen, phosphorus, and arsenic, wherein the third region comprises an element selected from the group consisting of nitrogen, phosphorus, and arsenic, wherein a concentration of the one or more elements in the pair of second regions is higher than a concentration of the element in the third region, and wherein a concentration of the one or more elements in the pair of the first regions is lower than the concentration of the one or more elements in the pair of the second regions.