Thin films of the spinel Cd1+xIn2-2xSnxO4 transparent conducting oxide solution

Thin films of a transparent conducting oxide solid solution Cd1+xIn2-2xSnxO 4 (x=0.15, 0.45, and 0.70) were deposited via rf magnetron sputtering. X-ra y diffraction indicated the films consisted of a polycrystalline spinel pha se. Atomic force microscopy measurements revealed a surface root mean squar e roughness between 1.3 and 6.0 nm. Optical absorption was 10% or less in t he visible for x=0.15, 0.45, and 0.70. Optical gaps averaged near 3.5, 3.70 , and 3.65 eV for films annealed in Ar/CdS of compositions corresponding to x=0.15, 0.45, and 0.70. Conductivity exceeded 2000 S/cm for x=0.15 and 400 0 S/cm for x=0.45 and 0.70. Mobilities of 43, 50, and 56 cm(2)/V s were mea sured for films annealed in Ar/CdS of compositions corresponding to x=0.15, 0.45, and 0.70, respectively. Composition data obtained via electron probe microanalysis indicate the films are becoming Cd deficient during the anne aling process. This suggests an excess of In+3 and/or Sn+4 on Cd+2 sites ma y play a role in carrier production in these films. The Cd volatilization m ay also inhibit crystallization and decrease mobility. (C) 2001 American In stitute of Physics.