Substrates having a broadband antireflection layer and methods of forming a broadband antireflection layer

A structure comprising:

• a base substrate having a polyimide substrate disposed over a first area of the base substrate and second area having a broadband antireflective layer that has a total specular reflection of less than 10% at a wavelength of about 400 to about 800 nm, wherein the broadband antireflective layer has a plurality of pillars that are not uniformly and are randomly spaced apart from one another, wherein the plurality of pillars are non-uniformly sized, wherein the broadband antireflective layer has a height of about 500 nm to about 1000 nm, wherein the plurality of pillars that have a spacing of about 10 nm to 300 nm between a pair of pillars as measured from pillar base to pillar base, and at least one pillar has a diameter at the base of about 50 to 300 nm.