Nanostructured CuO Thin Films Prepared through Sputtering for Solar Selective Absorbers

Figure 6

IR reflectance spectra of CuO thin films prepared at room temperature (with oxygen to argon gas flow ratios of 1 : 1 (A) and 2 : 1 (B)) and at a substrate temperature of 300°C (with oxygen to argon gas flow ratios of 1 : 1 (C) and 2 : 1 (D)).