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Can we measure correct band gap of a semiconductor by applying voltage across it and observing...

Can we measure correct band gap of a semiconductor by applying voltage across it and observing the power loss?

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No, we cannot measure the exact and correct band gap value of a semiconductor device just by applying a voltage across it and observing the power loss. However, we can measure the increment or decrement of the energy bandgap with respect to standard value by observing the power loss after we apply a voltage across it. If the power loss is low it means that the bandgap is high and the device acts as an insulator and high power loss will correspond to low value of energy bandgap.

We can measure the value of bandgap by applying a voltage across it by using four-probe method, which gives the value of bandgap energy by observing the resistivity.

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