Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8160146 | Physica B: Condensed Matter | 2018 | 6 Pages |
Abstract
In this study, simple ultrasound-assisted method was used for prepare the composite of (Cu-doped PVA) interfacial layer between metal and semiconductor (Al/p-Si). The scanning electron microscopy (SEM) images of the prepared (Cu-doped PVA) nanocomposites have shown an uniform fish scale shape, which are about 100â¯nm long and several tens of nm in width. Both the Al/p-Si (MS) and Al/(Cu-PVA)/p-Si (MPS) structures were fabricated on the same Si wafer to investigate the effect of this polymer layer on the electrical characteristics by using the current-voltage (I-V) and capacitance/conductance-voltage (C/G-V) measurements at room temperature. The values of reverse-saturation current (Io), ideality factor (n) and zero-bias barrier height (ΦBo) were obtained from the liner part of the forward bias I-V plot as 6.6â¯Ãâ¯10â10 A, 3.67 and 0.84â¯eV for MS structure and 1.82â¯Ãâ¯10â8 A, 4.18 and 0.76â¯eV for MPS structure, respectively. MPS structure has a good rectifier behavior with low leakage current in comparison to the MS structure. The high values of n was attributed to the barrier inhomogeneity at Al/p-Si, special density distribution of Nss at (Cu-PVA)/p-Si interface and both the existence of native SiO2 and deposited of (Cu-doped PVA) interlayer at M/S interface. The energy dependent values of Nss were obtained from the forward bias I-V data and they ranged from the 1.85â¯Ãâ¯1013â¯eVâ1cmâ2 (0.60â¯eV -Ev) to 7.40â¯Ãâ¯1013â¯eVâ1cmâ2 (0.40â¯eV - Ev) for MS structure and 9.81â¯Ãâ¯1012â¯eVâ1cmâ2 (0.67â¯eV -Ev) to 5.26â¯Ãâ¯1013â¯eVâ1cmâ2 (0.47â¯eV -Ev) for the MPS structure. Experimental results show that the (Cu-PVA) interlayer can be successfully used instead of traditional insulator layer because of the saturation of dangling bonds.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Ehsan Ahadi Akhlaghi, Yosef Badali, Semsettin Altindal, Yashar Azizian-Kalandaragh,