Band gap measurement of ZnO-MoO3-P2O5 glasses by photoconductivity
The preparation of a range of glasses based on the ternary system ZnO-MoO3-P2O5 network is reported. The time dependence resistance of these glasses at constant applied voltage reveals the absence of polarization effect. The glasses are characterized by photoconductivity measurements and optical band gaps are deduced from their respective spectral dependence curves under various applied voltages. The normalized photocurrent is found to increase with photon energy and applied voltage. The values of band gap and dark current as a function of applied voltage are deduced. It is demonstrated that normalized photocurrent arises from electron hopping transport mechanism.
Keywordsphosphate glasses electrical conductivity photoconductivity band gap
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