Forward and reverse bias current-voltage (I-V) characteristics in the metal-ferroelectric-semiconductor (Au/SrTiO3/n-Si) structures at room temperature

Buyukbas-Ulusan A., Altindal-Yeriskin S., TATAROĞLU A.

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, cilt.29, sa.19, ss.16740-16746, 2018 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 29 Konu: 19
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1007/s10854-018-9767-8
  • Sayfa Sayıları: ss.16740-16746


The main electrical parameters of fabricated Au/SrTiO3/n-Si (MFS) structures have been investigated by using various methods. The values of ideality factor (n) and zero-bias barrier height (I broken vertical bar(B0)) are calculated from the forward bias current-voltage (I-F-V-F) data as 0.60, and 0.48 eV from thermionic theory (TE) and Cheung functions, respectively. The value of R-s is also obtained from the Norde function and Cheung functions as 87.83 and 137.57 a"broken vertical bar, respectively. The discrepancy between these results can be attributed to the calculated method and the measured voltage range. Besides, the energy density distribution profile of interface state (N-ss) was obtained from the (I-F-V-F) data by taking into account voltage dependent barrier height (BH), n and without R-s. On the other hand, the possible current conduction mechanism (CCM) are determined by utilizing the In(I-F) versus In(V-F) and In(I-R) versus V-R (1/2) plots. The double logarithmic I-F-V-F plot shows three linear regions which are corresponding to low, moderate and high bias voltages with different slopes (m) as 2.40, 1.96 and 1.27 respectively. While the first region space charge limited current (SCLC) is dominated, the other two regions ohmic behavior is dominated. The field-lowering coefficient (beta) was also obtained from the slope of In(I-R)-V-1/2 plot as 4.40 10(-6) eV(-1) m(1/2) V-1/2. This value of beta is close to theoretical value of Poole-Frenkel emission (PFE) rather than Schottky emission (SE) mechanism.