| Autor: |
Goley, M., Chaudhary, S., Pandey, A., Mandal, V., Chattopadhyay, K. K., Banerjee, D. |
| Zdroj: |
Journal of the Institution of Engineers (India): Series D; December 2022, Vol. 103 Issue: 2 p629-638, 10p |
| Abstrakt: |
Cold cathode emission or cold field emission (CFE) is a purely quantum mechanical phenomenon. Here the exact mechanism behind the observed current–voltage relationship is yet to be pinpointed. For instance, a good cold emitter is very reasonably supposed to have low work function and good conductivity whereas carbon allotropes like diamond have just the reverse in both the cases, i.e., it is insulating in nature having a very wide band gap as well as high work function yet it is considered to be an efficient field emitter. Since the early twentieth century, different groups have suggested different equations or relations that can describe the experimental CFE current–voltage characteristics adequately. Although they all fundamentally follow an exponential law, so far the theory suggested by Fowler and Nordheim (F–N) is the most accepted one. However, there is another kind of voltage dependence of current, suggested by Millikan and Lauritsen (M–L) which is despite being reasonable not so common now a day to use. This article revisits both the F–N and M–L plots and has shown that one rather uses the M–L plot than the most widely used F–N plots due to its simplicity. To establish this, few cold field emission data of different carbon nanostructures have been analyzed by both F–N and M–L plot. It has been shown that the M–L plots may even be more useful sometimes along with their inherent simplicity. The detailed theoretical discussion has been incorporated along with the experimental verification. |
| Databáze: |
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