Optical and Sensing Properties of Cu Doped ZnO Nanocrystalline Thin Films

Table 2

Optical band gap of Cu doped ZnO thin films.

Sample	Composition	Optical band gap (eV)
Z1	0.1 M ZnO	3.28
Z1C1	0.1 M ZnO + 1% CuCl2	3.19
Z1C2	0.1 M ZnO + 2% CuCl2	3.20
Z2	0.15 M ZnO	3.20
Z2C1	0.15 M ZnO + 1% CuCl2	3.18
Z2C2	0.15 M ZnO + 2% CuCl2	3.22