Figure 2

Absorption coefficient of the films as a function of aging time at different wavelengths, namely 350 nm, 400 nm and 450 nm: (left) DHI thin films of 0.1 μm and 0.2 μm undergoing SSSP, and the 0.2 μm DHI films subjected to AISSP; (right) DHI thin films of 0.5 μm and 1 μm.