title: Triangular metallic gratings for large absorption enhancement in thin film Si solar cells.
abstract: We estimate high optical absorption in silicon thin film photovoltaic devices using triangular corrugations on the back metallic contact. We computationally show 21.9% overall absorptivity in a 100-nm-thick silicon layer, exceeding any reported absorptivity using single layer gratings placed on the top or the bottom, considering both transverse electric and transverse magnetic polarizations and a wide spectral range (280 - 1100 nm). We also show that the overall absorptivity of the proposed scheme is relatively insensitive to light polarization and the angle of incidence. We also discuss the implications of potential fabrication process variations on such a device.
authors.affiliation: Department of Electrical and Electronics Engineering, Bilkent University, Ankara 06800, Turkey. enesbattal@gmail.com
authors.forename: Enes
authors.initials: E
authors.lastname: Battal
authors.forename: Taha Alper
authors.initials: TA
authors.lastname: Yogurt
authors.forename: Levent Erdal
authors.initials: LE
authors.lastname: Aygun
authors.forename: Ali K
authors.initials: AK
authors.lastname: Okyay
mesh_terms: D000042:Absorption; D011211:Electric Power Supplies; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008567:Membranes, Artificial; D008670:Metals / Q000737:chemistry*; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D012825:Silicon / Q000737:chemistry*; D012993:Solar Energy
chemical_list: D008567:Membranes, Artificial; D008670:Metals; D012825:Silicon