title: Using autocloning effects to develop broad-bandwidth, omnidirectional antireflection structures for silicon solar cells.
abstract: In this study, we used the autocloning effect on pyramid structures to develop broad-bandwidth, omnidirectional antireflection structures for silicon solar cells. The angular dependence of reflectance on several pyramid structures was systematically investigated. The deposition of three-layer autocloned films reduced the refractive index gap between air and silicon, resulting in an increase in the amount of transmitted light and a decrease in the total light escaping. The average reflectance decreased dramatically to ca. 2-3% at incident angles from 0 to 60° for both sub-wavelength- and micrometer-scale pyramid structures. The measured reflectance of the autocloned structure was less than 4% in the wavelength range from 400 to 1000 nm for incident angles from 0 to 60°. Therefore, the autocloning technique, combined with optical thin films and optical gradient structures, is a practical and compatible method for the fabrication of broad-bandwidth, omnidirectional antireflection structures on silicon solar cells.
authors.affiliation: Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan.
authors.forename: Y C
authors.initials: YC
authors.lastname: Lee
authors.forename: S C
authors.initials: SC
authors.lastname: Tseng
authors.forename: H L
authors.initials: HL
authors.lastname: Chen
authors.forename: C C
authors.initials: CC
authors.lastname: Yu
authors.forename: W L
authors.initials: WL
authors.lastname: Cheng
authors.forename: C H
authors.initials: CH
authors.lastname: Du
authors.forename: C H
authors.initials: CH
authors.lastname: Lin