A photovoltaic module comprised of a plurality of series connected photovoltaic cells disposed upon a substrate is fabricated utilizing thin film device techniques. A body of photovoltaic stock material comprised of an electrically conductive substrate having at least a bottom electrode layer, a body of photovoltaic material, and a top electrode layer supported thereupon is patterned so as to define a number of individual, electrically isolated photovoltaic cells and a number of electrically isolated connection zones. The connection zones are patterned to each include a portion of the bottom electrode material and are configured so that the bottom electrode material in each segment of the connection zone is exposed, and is in electrical communication with the bottom electrode portion of a particular cell. A current collecting grid structure is disposed on the top electrode of each cell and is placed in electrical communication with the bottom electrode of an adjoining cell via the electrode layer in an appropriate connection zone. In this manner, a series interconnection between the cells is established. Electrical terminals may be affixed to the module, and the finished module may be encapsulated in a body of protective materials. The substrate used in the manufacture of the module may comprise a thin, flexible layer of polymeric material and the disclosed techniques may be utilized to fabricate ultra lightweight photovoltaic modules. Also disclosed are specific module structures.