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Figure 3

From: Enhanced room temperature ferromagnetism and green photoluminescence in Cu doped ZnO thin film synthesised by neutral beam sputtering

Figure 3

(a) Absorption spectra of Cu doped ZnO thin film shows the band edge of ZnO in all samples alongwith SPR at higher Cu concentration (≥7%) and tauc’s plot with optical band gap energy of (b) ZC3, (c) ZC7, (d) ZC15 sample is shown, (e) determination of band gap from tauc’s plot shows the decrease in band gap with increase in Cu concentration.

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