Investigations on magnetron sputtered ZnO thin films and Au/ZnO Schottky diodes

Dhananjay, J. Nagaraju, S. B. Krupanidhi

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Magnetron sputtering is a promising technique for the growth of oxide materials including ZnO, which allows deposition of films at low temperatures with good electrical properties. The current-voltage (I-V) characteristics of Au Schottky contacts on magnetron sputtered ZnO films have been measured over a temperature range of 278-358K. Both effective barrier height (φB,eff) and ideality factor (n) are found to be a function of temperature, and this behavior has been interpreted on the basis of a Gaussian distribution of barrier heights due to barrier height inhomogeneities that prevail at the interface. Density of states (DOS) near the Fermi level is determined using a model based on the space charge limited current (SCLC). The dispersion in both real and imaginary parts of the dielectric constant at low frequencies, with increase in temperature is attributed to the space charge effect. Complex impedance plots exhibited two semicircles, which corresponds to bulk grains and the grain boundaries.

Original languageEnglish
Pages (from-to)344-349
Number of pages6
JournalPhysica B: Condensed Matter
Volume391
Issue number2
DOIs
Publication statusPublished - 01-04-2007

Fingerprint

Schottky diodes
Diodes
Thin films
space charge
thin films
Electric space charge
normal density functions
Temperature
temperature
electric contacts
magnetron sputtering
Gaussian distribution
inhomogeneity
grain boundaries
plots
Fermi level
electrical properties
impedance
Magnetron sputtering
permittivity

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Dhananjay ; Nagaraju, J. ; Krupanidhi, S. B. / Investigations on magnetron sputtered ZnO thin films and Au/ZnO Schottky diodes. In: Physica B: Condensed Matter. 2007 ; Vol. 391, No. 2. pp. 344-349.
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Investigations on magnetron sputtered ZnO thin films and Au/ZnO Schottky diodes. / Dhananjay; Nagaraju, J.; Krupanidhi, S. B.

In: Physica B: Condensed Matter, Vol. 391, No. 2, 01.04.2007, p. 344-349.

Research output: Contribution to journalArticle

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