Temperature dependence of characteristic parameters of the H-terminated Sn/p-Si(100) Schottky contacts

Karatas S., Altindal Ş., Turut A., Ozmen A.

APPLIED SURFACE SCIENCE, cilt.217, ss.250-260, 2003 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 217
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1016/s0169-4332(03)00564-6
  • Dergi Adı: APPLIED SURFACE SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.250-260
  • Anahtar Kelimeler: Schottky contacts, Gaussian distribution, activation energy, BARRIER HEIGHT INHOMOGENEITIES, ELECTRON-EMISSION MICROSCOPY, N-TYPE, CURRENT TRANSPORT, DIODES, VOLTAGE
  • Gazi Üniversitesi Adresli: Evet

Özet

The current-voltage (I-V) characteristics of Sn/hydrogen-terminated p-type Si Schottky contacts have been measured in the temperature range of 150-400 K. It is shown that the occurrence of a Gaussian distribution of then BHs is responsible for the decrease of the apparent BH Phi(b0), increase of the ideality factor n and non-linearity in the activation energy plot at low temperatures. A Phi(b0) versus 1/T plot was drawn to obtain evidence of a Gaussian distribution of the BHs, and values of (Phi) over bar (b0) = 1.049 eV and sigma(0) = 0.114 V for the mean B H and zero-bias standard deviation have been obtained from this plot, respectively. Then, a modified ln(I-0/T-2) - q(2)sigma(0)(2)/2k(2)T(2) versus 1/T plot gives (Phi) over bar (b0) and A* as 1.026 eV and 14.60 A cm(-2) K-2, respectively. It has been concluded that the temperature dependent I-V characteristics of the device can be successfully explained on the basis of a thermionic emission mechanism with Gaussian distribution of the BHs. Furthermore, an average value of -0.247 meV K-1 for the temperature coefficient has been obtained; the value of -0.247 meV K-1 for hydrogen-terminated p-type Si differs from those in the literature due to the termination with hydrogen of the p-Si surface. (C) 2003 Elsevier Science B.V. All rights reserved.