Patent ID: 7791074
Filing Date: 2010-09-07
Classification: H01L

Abstract:
1. A field effect transistor comprising: a channel layer of an amorphous oxide film containing In or Zn, wherein the amorphous oxide film shows an electron carrier concentration and an electron mobility such that the electron mobility tends to increase as the electron carrier concentration increases, wherein the amorphous oxide film contains hydrogen or deuterium at a concentration in the range of 10 wherein the composition of the amorphous oxide film containing hydrogen or deuterium is represented by the following equation that excludes the hydrogen: where 0≦x≦1, 0≦y≦1, 0≦z<1, 0≦a<1, 0≦b<1, 0≦c<1, and a+b+c=1 hold, M4 is an element (Si, Ge, or Zr) of Group IV having an atomic number smaller than that of Sn, M3 is Lu or an element (B, Al, Ga, or Y) of Group III having an atomic number smaller than that of In, and M2 is an element (Mg or Ca) of Group II having an atomic number smaller than that of Zn.