NOVELTY - The vacuum collector tube (VR) comprises two tubes that are arranged in each other in a concentric manner and forms a closed chamber, which is evacuated. The outside of the inner tube (Ri) comprises a transparent conducting oxide layer (TCOi), which is covered with a layer of zinc oxide nanorods (NR) that are vertically free-standing. The inner tube, the transparent conducting oxide layer and the zinc oxide nanorods form the selective absorber of the vacuum collector tube. The inner tube is made of black glass or thin black plastic tube or metal tube with applied thin light-absorbing layer.    USE - Vacuum collector tube for coupling sunlight.    ADVANTAGE - The vacuum collector tube can be economically manufactured, and is capable of efficiently coupling the sunlight with reduced emission of heat radiation.    DETAILED DESCRIPTION - The vacuum collector tube (VR) comprises two tubes that are arranged in each other in a concentric manner and forms a closed chamber, which is evacuated. The outside of the inner tube (Ri) comprises a transparent conducting oxide layer (TCOi), which is covered with a layer of zinc oxide nanorods (NR) that are vertically free-standing. The inner tube, the transparent conducting oxide layer and the zinc oxide nanorods form the selective absorber of the vacuum collector tube. The inner tube is formed from black glass or thin black plastic tube or metal tube with applied thin light-absorbing layer. The transparent conducting oxide layer has a thickness of 40-4000 nm. The zinc oxide nanorods have a diameter of 30-500 nm and a length of 100-3000 nm. The zinc oxide nanorods have a distance to each other, where the distance is 10-100 nm, are formed in a needle-shaped manner, and run out into a pointed truncated cone. An additional transparent conducting oxide layer is applied on an outside of the outer tube (Ra) that is transparent and a further transparent conducting oxide layer is applied on an inside of the outer tube that is transparent. The thickness of the additional transparent conducting oxide layer is 20-3000 nm. An INDEPENDENT CLAIM is included for a method for producing a vacuum collector tube.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of an arrangement (Drawing includes non-English language text).    Outer tube (Ra)    Inner tube (Ri)    Zinc oxide nanorods (NR)    Vacuum collector tube (VR)    Transparent conducting oxide layer. (TCOi)