On the anomalous peak in the forward bias capacitance and conduction mechanism in the Au/n-4H SiC (MS) Schottky diodes (SDs) in the temperature range of 140-400 K
Küçük Resim Yok
Tarih
2015
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
World Scientific Publ Co Pte Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The temperature and voltage dependence profile of the surface states (N-ss), series resistance (R-s) and electrical conductivity (sigma(ac)) have been investigated in temperature and voltage ranges of 140-400 K and (-5 V)-(6 V), respectively, The value of barrier height (BIT) decreases with increasing temperature as Phi(B)(T) = (1.02- 4 x 10(-4)center dot T) eV. These values of negative temperature coefficient (-4 x 10(-4) eV center dot K-1) is in good agreement with the a of band gap of SiC (-3.1 x 10(-4) eV K-1). Capacitance-voltage (C-17) plots for all temperatures show an anomalous peak in the accumulation region because of the effect of series resistance (R-s) and N-ss. The effect of R-s and N-ss on the C and conductance (G) are found noticeable high especially at low temperatures. The decrease in C values also corresponds to an increase in G/w values in the accumulation region. In addition, Ln(sigma(ac)) versus q/kT plots have two straight lines with different slopes which are corresponding to below and above room temperatures for various forward biases which are an evident two valid possible conduction mechanisms. The values of activation (E-alpha) were obtained from the slope of these plots and they changed from 6.3 rneV to 4.7 meV below room temperatures and 42.5 rneV to 34.4 meV for above room temperatures, respectively.
Açıklama
Anahtar Kelimeler
Au/n-4H SiC SDs; electrical characteristics; temperature and voltage dependence; AC electrical conductivity and activation energy
Kaynak
International Journal Of Modern Physics B
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
29
Sayı
4
