Fabrication of highly ordered CuInSe2 films with hollow nanocones for anti-reflection

► Highly ordered CuInSe2 films with hollow nanocones are fabricated. ► Surface patterns of nanocones array and hollow nanocones array are obtained. ► Both of these textured array show anti-reflection properties. ► Hollow nanocones array has larger reflection suppression effect than nancones without hollow. ► The deeper the hollow, the more the reflection is reduced.