NOVELTY - An optoelectronic apparatus comprises a metal electrode grid; an optoelectronic functional layer; and a network of nanostructures, where the electrode grid is superimposed on the network of nanostructures, and the network of nanostructures is in electrical contact with the functional layer. The network of nanostructures fills gaps in the electrode grid. The nanostructures are nanotubes (preferably single-wall carbon nanotubes). The apparatus further comprises a polymer, which is in electrical contact with the network of nanostructures. The polymer serves as a passivation layer.    USE - As an optoelectronic apparatus such as solar cell (claimed).    ADVANTAGE - The network of nanostructures has a sheet resistance of less than 300 Omega/square and an optical transmission of at least 85%. The nanostructure-film that fills gaps in the metal electrode grid can improve device efficiency significantly by allowing separated charges additional collection pathways. The nanostructure network enhances device performance through its high work function, while the electrode grid typically acts as the primary charge-harvesting element, to which charge and current flow from the nanostructure network. The nanostructure network provides a relatively low-resistance path to the electrode grid.    DETAILED DESCRIPTION - An optoelectronic apparatus comprises a metal electrode grid; an optoelectronic functional layer; and a network of nanostructures, where the electrode grid is superimposed on the network of nanostructures, and the network of nanostructures is in electrical contact with the functional layer. The network of nanostructures fills gaps in the electrode grid. The nanostructures are nanotubes. The apparatus further comprises a polymer, which is in electrical contact with the network of nanostructures. The polymer serves as a passivation layer. The polymer forms a distinct layer adjacent to the network of nanostructures, or a composite with the network of nanostructures. The polymer is a conducting polymer. An INDEPENDENT CLAIM is included for fabricating an optoelectronic apparatus, involving depositing a network of nanostructures; depositing a grid layer; and patterning the grid layer into an electrode grid, where the electrode grid is superimposed on the network of nanostructures.    DESCRIPTION OF DRAWING(S) - The figure shows a flowchart of a nanostructure-film fabrication method.