NOVELTY - The method comprises providing solar cells of which each has a back conductive surface and a front illuminated conductive surface that includes an active region and a contacting region, where a conductive terminal layer is disposed over the contacting region, attaching a first end of a conductor to a portion of the conductive terminal layer to form a terminal structure, forming a solar cell circuit by electrically interconnecting solar cells using copper ribbon interconnects, and forming a surface preparation layer over the terminal structure.    USE - The method is useful for roll-to-roll manufacturing of a moisture resistive photovoltaic module on flexible foil substrates.    ADVANTAGE - The method ensures economic roll-to-roll manufacture of the moisture resistive photovoltaic module with improved yield and performance in less number of processing steps.    DETAILED DESCRIPTION - The method comprises providing solar cells of which each has a back conductive surface and a front illuminated conductive surface that includes an active region and a contacting region, where a conductive terminal layer is disposed over the contacting region, attaching a first end of a conductor to a portion of the conductive terminal layer to form a terminal structure, forming a solar cell circuit by electrically interconnecting solar cells using copper ribbon interconnects, forming a surface preparation layer providing as a surface smooth as an active region surface smoothness of the front illuminated conductive surface over the terminal structure of each of the solar cells without extending the surface preparation layer over active region, forming a moisture barrier layer over the active region and the surface preparation layer of each of the solar cells, and encapsulating the solar cell circuit in a protective package. A first end of each interconnect is attached to a portion of the terminal layer of each of the solar cells to form terminal structure for each of the solar cells. The surface preparation layer covers the first end of the conductor of each of the solar cells. The terminal layer comprises busbars and fingers, and the first end of the conductor is attached to the busbar. The step of forming the moisture barrier layer comprises an atomic layer deposition process. INDEPENDENT CLAIMS are included for:    (1) a moisture resistive solar cell; and    (2) a moisture resistive photovoltaic module.    DESCRIPTION OF DRAWING(S) - The diagram shows a cross-sectional schematic view of a portion of an optoelectronic device.    Substrate (102C)    Bottom electrode layer (104C)    Vias (116)    Contact layer (120)    Electrical contact. (122)