I´m doing a Tauc plot of my NPs, and i´m getting value around -1.5E-19 eV.
This clearly makes no sense, i guess i´m making some mistakes in the units of measure, but i can´t find which.
Can anybody help me?
thank in advance.
Tauc plots are presenting (alpha*energy)^x vs Energy with E in eV and alpha in cm-1. x depends on the nature of the optical transition. If this is a direct allowed transition x = 2 provides you a linear plot, for an indirect allowed one you get a linear plot with x = 0.5. Extrapoling the linear region to the 0 of the Y axis provides you the gap in eV. The values of the Y axis can be pretty high but this does not matter. The only interesting physical value will be the gap extracted from the plot and the gap is in eV.
Sounds like the conversion between wavelength and energy went wrong. When you forget the elementary charge you get an error on the order of 1.6E-19. This would get you to 0.9eV.
Thanks for the answers!
Eventually i figured it out.
it was exactly as Dr. Ehrler said.
- Badges
- Science topic
- Similar topics
- Chemistry
- Nanotechnology