title: Axially connected nanowire core-shell p-n junctions: a composite structure for high-efficiency solar cells.
abstract: A composite nanostructure for high-efficiency solar cells that axially connects nanowire core-shell p-n junctions is proposed. By axially connecting the p-n junctions in one nanowire, the solar spectrum is separated and absorbed in the top and bottom cells with respect to the wavelength. The unique structure of nanowire p-n junctions enables substantial light absorption along the nanowire and efficient radial carrier separation and collection. A coupled three-dimensional optoelectronic simulation is used to evaluate the performance of the structure. With an excellent current matching, a promising efficiency of 19.9% can be achieved at a low filling ratio of 0.283 (the density of the nanowire array), which is much higher than the tandem axial p-n junctions.
authors: State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, No. 10. Xitucheng Road, Beijing, 100876 China.
authors: Sijia
authors: S
authors: Wang
authors: State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, No. 10. Xitucheng Road, Beijing, 100876 China.
authors: Xin
authors: X
authors: Yan
authors: State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, No. 10. Xitucheng Road, Beijing, 100876 China.
authors: Xia
authors: X
authors: Zhang
authors: State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, No. 10. Xitucheng Road, Beijing, 100876 China.
authors: Junshuai
authors: J
authors: Li
authors: State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, No. 10. Xitucheng Road, Beijing, 100876 China.
authors: Xiaomin
authors: X
authors: Ren
keywords: Nanophotonics and photonic crystals; Semiconductors; Solar energy