Monolayer thin film of subwavelength nanospheres for antireflection coatings

Excellent broadband antireflection (AR) effect from thin films of monolayer silica nanospheres with diameter of ~100nm self-assembled on glass substrates was demonstrated. With a monolayer thin film of silica nanospheres coated on both sides of a glass, we achieved maximum transmittance of ~99% at 560nm. Preliminary result shows that such monolayer thin film could be applied in organic solar cells to enhance the light absorption in the polymer active layer. OPV device with single side nanospheres AR layer has gained an efficiency enhancement of ~8% compared to devices without AR layers.