Is UV Visible technique reliable for calculation of band gap or not ?

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Ayan Sarkar

Yes, it is reliable. There are plenty of papers where researchers have applied this technique for determining the band gap of the material under consideration.

You may read the paper.

Phys. Chem. Chem. Phys., 2016, DOI:10.1039/C6CP05154E.

Dheeraj Kumar

Here you can find good explanation and band gap calculator,

http://www.instanano.com/characterization/theoretical/uv-vis-spectroscopy-band-gap-calculation/