Why is the band gap of GR/SnO2 is zero?

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Avishek Das

Hi, Zeng,

Do you have any absorption spectra for this sample of yours.?

Gustavo Henrique de Magalhães Gomes

Dear Zeng-Xi,

Make sure that you used the Tauc method correctly.

I think it's not possible to calculate a zero bandgap using the standard method, can you show us your UV Vis spectra?

If your material has a bandgap of zero eV, the material isn't a semicondutor, but a conductor, then you should change your way to measure the optical and eletrical properties.

Best regards.

I agree with Gustavo. Please send the UV-VIS data and also tell your thickness of the film.

We S-R

Thanks a lot! I also think it is the nature of the metal, I wonder that may be the calculation problem of SnO2 body materials, because for SnO2 material in the process of computing the LDA + U, do not have the relevant literature documente the U value .it sometimes make me nervous.Give me help!Thanks again!

Zeng,

Doing some research I found that the band gap of SnO2 is 3.6 eV. So you should consider review your research about this. Could you show us your UV Vis spectra?

Bets regards,

Please share (if you like) your UV-VIS-NIR data. So that we can extract the band gap from Tauc's plot and can help you. If you do not have then please do this experiment.

Please follow this journal. Else download the file attached.

Article Synthesis and Low-Temperature Photoluminescence Properties o...

Qijin Chi

It is a suprising result. Do you mean GR being graphene or reduced graphene oxide?

I am a green hand,So, there will always be a lot of things that i don't know, but also want your understandings.I'm in first principles calculation, hasn't done the experiment, and can not verify the results from the experiment.I do is graphene system, rather than reducd graphene oxide.Thanks for your helps, I will make persistent efforts, hope to be able to get the correct and scientific results.

You should to experiments before conclude something.

This is a scientific advice.

Hope you do good research.

Best regards

thanks a lot ! i will do it .