title: Absorption enhancement in ultrathin crystalline silicon solar cells with antireflection and light-trapping nanocone gratings.
abstract: Enhancing the light absorption in ultrathin-film silicon solar cells is important for improving efficiency and reducing cost. We introduce a double-sided grating design, where the front and back surfaces of the cell are separately optimized for antireflection and light trapping, respectively. The optimized structure yields a photocurrent of 34.6 mA/cm(2) at an equivalent thickness of 2 μm, close to the Yablonovitch limit. This approach is applicable to various thicknesses and is robust against metallic loss in the back reflector.
authors.affiliation: Department of Applied Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: Ken Xingze
authors.initials: KX
authors.lastname: Wang
authors.forename: Zongfu
authors.initials: Z
authors.lastname: Yu
authors.forename: Victor
authors.initials: V
authors.lastname: Liu
authors.forename: Yi
authors.initials: Y
authors.lastname: Cui
authors.forename: Shanhui
authors.initials: S
authors.lastname: Fan
mesh_terms: D000042:Absorption; D011211:Electric Power Supplies; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D008027:Light; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D012825:Silicon / Q000737:chemistry*; D012993:Solar Energy
chemical_list: D012825:Silicon