Thin Films of the Spinel Cd1+xIn2-2xSnxO4 Transparent Conducting Oxide Solution

D. R. Kammler, T. O. Mason, D. L. Young, T. J. Coutts

Research output: Contribution to journalArticlepeer-review

25 Scopus Citations

Abstract

Thin films of a transparent conducting oxide solid solution Cd1+xIn2-2xSnxO4 (x = 0.15, 0.45, and 0.70) were deposited via rf magnetron sputtering. X-ray diffraction indicated the films consisted of a polycrystalline spinel phase. Atomic force microscopy measurements revealed a surface root mean square roughness between 1.3 and 6.0 nm. Optical absorption was 10% or less in the 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 4000 S/cm for x = 0.45 and 0.70. Mobilities of 43, 50, and 56 cm2/V s were measured 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 annealing process. This suggests an excess of In+3 and/or Sn+4 on Cd+2 sites may play a role in carrier production in these films. The Cd volatilization may also inhibit crystallization and decrease mobility.

Original languageAmerican English
Pages (from-to)3263-3268
Number of pages6
JournalJournal of Applied Physics
Volume90
Issue number7
DOIs
StatePublished - 2001

NREL Publication Number

  • NREL/JA-520-31841

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