title: A high efficiency dual-junction solar cell implemented as a nanowire array.
abstract: In this work, we present an innovative design of a dual-junction nanowire array solar cell. Using a dual-diameter nanowire structure, the solar spectrum is separated and absorbed in the core wire and the shell wire with respect to the wavelength. This solar cell provides high optical absorptivity over the entire spectrum due to an electromagnetic concentration effect. Microscopic simulations were performed in a three-dimensional setup, and the optical properties of the structure were evaluated by solving Maxwell's equations. The Shockley-Queisser method was employed to calculate the current-voltage relationship of the dual-junction structure. Proper design of the geometrical and material parameters leads to an efficiency of 39.1%.
authors: Computational Electronics and Photonics Group, University of Kassel, Wilhelmshöher Allee 71, 34121 Kassel, Germany. shuqing@uni-kassel.de
authors: Shuqing
authors: S
authors: Yu
authors: Bernd
authors: B
authors: Witzigmann
mesh_terms: D000042:Absorption; D011211:Electric Power Supplies; D004867:Equipment Design; D053770:Nanowires / Q000737:chemistry*; D012542:Scattering, Radiation; D012825:Silicon / Q000737:chemistry*; D012993:Solar Energy; D013472:Sunlight
chemical_list: D012825:Silicon