Figure 7A. Allowed direct energy band gap of CuO thin films furnace annealed at: (a) 400°C, (b) 500°C, (c)600°C

From

Effect of Annealing by CO2 Laser on Structural and Optical Properties of CuO Thin Films Prepared by Sol – Gel Method

Khalil Ibrahim Mohammed, Awatif Sabir Jasim, Sahar Naji Rashid

International Journal of Physics. 2016, 4(3), 59-63 doi:10.12691/ijp-4-3-3