On double exponential forward bias current-voltage (I-V) characteristics of Au/Ca3Co4Ga0.001Ox/n-Si/Au (MIS) type structures in temperature range of 80-340 K
Küçük Resim Yok
Tarih
2015
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Taylor & Francis Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Current transport mechanisms (CTMs) of Au/Ca3Co4Ga0.001Ox/n-Si/Au (MIS) type structures were investigated using current-voltage (I-V) characteristics in the temperature range of 80-340K. Semilogarithmic I-V plots show two linear regions corresponding to low (0.075-0.250V) and moderate (0.27-0.70V) biases, respectively. Zero-bias barrier height (phi(B0)) was observed to increase with increase in the temperature, whereas opposite behaviour was observed for ideality factor (n). phi(B0) and (n(-1)-1) vesus q/2kT and phi(B0) versus n plots were drawn to get an evidence of Gaussian distribution (GD) of the barrier heights. These plots, too, show two linear regions corresponding to low (80-160K) and high (200-340K) temperature ranges (LTR and HTR), respectively. Mean value of barrier height ( [GRAPHICS] (B0)) and standard deviation (sigma(s)) were extracted from the intercept and slope of phi(B0) versus q/2kT plots for two linear regions as 0.382eV, 0.0060V for LTR and 0.850eV, 0.135V for HTR at low biases and 0.364eV, 0.0059V for LTR and 0.806eV, 0.132V for HTR at high biases, respectively. [GRAPHICS] (B0) and Richardson constant (A*) values were also obtained from the intercept and slope of the modified Richardson (Ln(I-o/T-2)-(q(2)sigma(2)(s)/2k(2)T(2)) versus q/kT) plots as 131.81 Acm(-2)K(-2), 0.381eV for LTR and 129.35 Acm(-2)K(-2), 0. 854eV for HTR at low biases and 148.01 Acm(-2)K(-2), 0.377eV for LTR and 143.77 Acm(-2)K(-2), 0.812eV for HTR at high biases, respectively. In conclusion, CTM in the structure can be successfully explained in terms of thermionic emission theory with the double GD of barrier heights.
Açıklama
Anahtar Kelimeler
Au/Ca3Co4Ga0.001Ox/n-Si/Au structures; temperature and voltage dependent; modified richardson plot; double Gaussian distribution
Kaynak
Philosophical Magazine
WoS Q Değeri
Q1
Scopus Q Değeri
Q3
Cilt
95
Sayı
10
