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http://nopr.niscpr.res.in/handle/123456789/24409| Title: | Origin of non-ideal current-voltage characteristics of metal-semiconductor contact: A numerical study |
| Authors: | Chand, Subhash Kumar, Jitendra |
| Issue Date: | Oct-2000 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The current-voltage (I-V) characteristics of Schottky diodes having spatial inhomogeneities are simulated using thermionic emission-diffusion mechanism and assuming a Gaussian distribution of barrier heights. The contact interface is assumed to have a number of non-interacting parallel diodes each with different barrier height within the distribution limits. Simulations of I-V characteristics of Schottky diodes were carried out both with mean and standard deviation of the distribution as constant or bias dependent. The resulting data are analysed to get insight into the effects of distribution parameters on the barrier height, activation energy plots and ideality factor over a temperature range 60-300 K. Simulation results show that a Schottky contact exhibiting Gaussian distribution of barrier heights with constant mean and standard deviation continues to behave as a homogeneous diode of apparently low barrier height with close to unity ideality factor. However, simulations carried out considering the linear bias dependence of mean and standard deviation yields a log(I)-V curve which correspond to the same low barrier height but with high ideality factor. These effects increase with increasing the value of the standard deviation. The series resistance plays a pivotal role in influencing the linearity of the log(I)-V curves of Schottky diodes exhibiting Gaussian distribution of barrier heights. Thus, it is shown that simulation of I-V data of Schottky diodes by incorporating barrier inhomogeneities give rise to non-ideal characteristics with low barrier height, high ideality factor and non-linear activation energy plot. |
| Page(s): | 268-273 |
| Appears in Collections: | IJEMS Vol.07(5-6) [October-December 2000] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJEMS 7(5-6) 268-273.pdf | 1.45 MB | Adobe PDF | View/Open |
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