Patent ID: 8592261

Claim:
A method for designing a semiconductor device comprising the steps of: forming a barrier film over a substrate; after forming the barrier film, forming a silicon oxide film over the barrier film; forming an organic film so as to cover the silicon oxide film; coating the organic film with deuterated water; partly removing the deuterated water before a conductive film is formed; forming the conductive film in contact with the organic film; measuring a concentration of deuterium atoms in the silicon oxide film; selecting a conductive material so that the concentration of the deuterium atoms in the silicon oxide film is higher than or equal to 1×10 15 atoms/cm 3 and lower than or equal to 1×10 17 atoms/cm 3 ; and applying the conductive material to a second electrode of a light-emitting element comprising a first electrode and the second electrode, the first electrode and the second electrode overlapping with each other, wherein the first electrode is electrically connected to a source or a drain electrode of a transistor including an oxide semiconductor layer in a channel formation region.