Barrier characteristics of PtSi/p-Si Schottky diodes as determined from I-V-T measurements

P. G. McCafferty, A. Sellai, P. Dawson, H. Elabd

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Abstract

The current-voltage-temperature characteristics of PtSi/p-Si Schottky barrier diodes were measured in the temperature range 60-115 K. Deviation of the ideality factor from unity below 80 K may be modelled using the so-called T0 parameter with T0 = 18 K. It is also shown that the curvature in the Richardson plots may be remedied by using the flatband rather than the zero-bias saturation current density. Physically, the departure from ideality is interpreted in terms of an inhomogeneous Schottky contact. Here we determine a mean barrier height at T = 0 K, Φ̄0b = 223 mV, with an (assumed) Gaussian distribution of standard deviation σΦ, = 12.5 mV. These data are correlated with the zero-bias barrier height, Φ0j = 192 mV (at T = 90 K), the photoresponse barrier height, Φph = 205 mV, and the flatband barrier height, Φfb = 214 mV. Finally, the temperature coefficient of the flatband barrier was found to be -0.121 mV K-1, which is approximately equal to 1/2(dEig/dT), thus suggesting that the Fermi level at the interface is pinned to the middle of the band gap.

Original languageEnglish
Pages (from-to)583-592
Number of pages10
JournalSolid State Electronics
Volume39
Issue number4 SPEC. ISS.
DOIs
Publication statusPublished - Apr 1996

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ASJC Scopus subject areas

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

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