NOVELTY - A zinc oxide anti-reflection layer having a syringe-like structure comprises: zinc oxide lower portion (110), where the zinc oxide lower portion has nanorod array structure; and zinc oxide upper (120) portion connected to the zinc oxide lower portion, where the zinc oxide lower portion and the zinc oxide upper portion have a syringe-like structure. The anti-reflection layer further comprises porous seed layer formed below the zinc oxide lower portion.    USE - As a zinc oxide anti-reflection layer having a syringe-like structure (claimed), used in various solar cells, such as a single crystalline silicon solar cell, polycrystalline silicon solar cell, silicon thin film solar cell, Group III-V solar cell, or copper indium gallium diselenide (CIGS) thin film solar cell.    ADVANTAGE - The zinc oxide anti-reflection layer has an excellent anti-reflection property and thus it is advantageously used in solar cells. The photoelectric conversion efficiency of a solar cell is significantly enhanced by up to 32% by using the syringe-like zinc oxide and 90 nm of the silicon nitride (Si3N4) layer as the anti-reflection layer, compared with the photoelectric conversion efficiency of a solar cell without an anti-reflection layer.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for fabricating the zinc oxide anti-reflection layer having a syringe-like structure, involving: providing a substrate; soaking the substrate in a first solution to conduct a first hydrothermal process to form a zinc oxide lower portion, where the first solution contains a solution of zinc ions; removing the substrate from the first solution; and soaking the substrate in a second solution to conduct a second hydrothermal process to form a zinc oxide upper portion, where the second solution contains crystallization inhibitor, and the zinc oxide upper portion is connected to the zinc oxide lower portion to form a syringe-like zinc oxide anti-reflection layer.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional schematic view of a zinc oxide anti-reflection layer having a syringe-like structure.    Zinc oxide lower portion (1110)    Zinc oxide upper (120)