Table 5 The optical \(\:{E}_{g}\)and types of electron transition from tauc’s model.

Direct

Indirect

Samples

Eg\(\:\:\left(\varvec{e}\varvec{V}\right)\)

\(\:{\left(\varvec{\upalpha\:}\mathbf{h}\varvec{\upupsilon\:}\right)}^{2}\)

E_g\(\:\:\left(\varvec{e}\varvec{V}\right)\)

\(\:{\left(\varvec{\upalpha\:}\mathbf{h}\varvec{\upupsilon\:}\right)}^{\frac{2}{3}}\)

E_g\(\:\:\left(\varvec{e}\varvec{V}\right)\:\)

\(\:{\left(\varvec{\upalpha\:}\mathbf{h}\varvec{\upupsilon\:}\right)}^{\frac{1}{2}}\)

E_g\(\:\:\left(\varvec{e}\varvec{V}\right)\)

\(\:\:{\left(\varvec{\upalpha\:}\mathbf{h}\varvec{\upupsilon\:}\right)}^{\frac{1}{3}}\)