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• W1971661562 abstract "Abstract Well-aligned ZnO nanorods were synthesized by a vapor phase transport method on ZnO buffer layer coated n-Si substrates. X-ray diffraction and scanning electron microscopy results showed that the deposited ZnO nanorods crystallize in the wurtzite structure and are highly textured with their c-axes normal to the substrate and show a clearly hexagonal morphology. A heavily compensated and intrinsic ZnO layer (i-ZnO) doped with both Mg and Na was deposited on the nominally undoped ZnO nanorods (which show a natural n-type behavior) to produce an i-ZnO/n-ZnO homojunction. The i-ZnO layer consisted of the grainy shape nano-crystallites with the wavy surface morphology. The current–voltage (I–V) characteristics of these structures in the temperature range of 150–300 K have been analyzed in the framework of standard thermionic emission (TE) theory with the assumption of a Gaussian distribution of the barrier heights. The values of zero bias barrier height (Φb0) and ideality factor (n) were found to be strongly temperature dependent whereby n decreases while Φb0 increases with increasing temperature. The ln(I0/T2) vs q/kT plot shows a straight line behavior and the values of activation energy (Ea = Φb0) and the Richardson constant (A*) determined from the intercept and slope of the plot were 0.926 eV and 2.61 × 10−8 A cm−2 K−2, respectively. This value of A* is much lower than the known value of 32 A cm−2 K−2 for ZnO. Thus, a modified ln ( I 0 / T 2 ) − ( σ 0 2 q 2 / 2 k 2 T 2 ) vs. q/kT plot based on a Gaussian distribution of barrier heights was used which yields a mean barrier height ( Φ ¯ b 0 ) and modified effective Richardson (A**) of 1.032 eV and 34.85 A cm−2 K−2, respectively. This value of A** is much closer to the theoretical value of 32 A cm−2 K−2 for ZnO." @default.
• W1971661562 created "2016-06-24" @default.
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• W1971661562 date "2012-09-01" @default.
• W1971661562 modified "2023-09-26" @default.
• W1971661562 title "Fabrication and structural, electrical characterization of i-ZnO/n-ZnO nanorod homojunctions" @default.
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• W1971661562 doi "https://doi.org/10.1016/j.cap.2012.03.021" @default.
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