Hi all,
I plotted two types of graphs, (αhv)2 vs E and (αhv)1/2 vs E in order to determine the energy band gap of ZnO nanowires for my sample.
As we know, ZnO is direct band gap which means that extrapolation graph of (αhv)2 vs E will fit the correct transition type.
But somehow, it bothers me because I obtained the similar pattern graph of (αhv)1/2 vs E.
Can anyone help me to explain why I need to choose the extrapolation of graph (αhv)2 vs E, instead of (αhv)1/2 vs E from the graph I attached below.
Thank you.
Hi,
(αhv)2 vs E will give you the allowed direct band gap value of ZnO. So go with is only.
The graph (αhv)2 vs E should be chosen......... ZnO has direct band gap.
Semiconductors have both energy gaps, direct and indirect. Generally, the indirect gap is lower than the direct gap, as you obtain in your experiment. Althought is well known that ZnO is a direct gap semiconductor, in your case, you have nanowires and not a bulk sample. It could be possible than in the case of nanowires you can observe also the indirect gap. Do not discard anything, may be you have important information.
hi all, but how to get Electronic band gap(BG) if we get uv-vis as absorbance(A) vs Wavelength(nm)?
hi
my query is whether background fitting is necessary while doing Taucs plot in origin
No,they are not similar.you should choose one of them,direct or indirect, dependent on your material.
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