NOVELTY - Assembly (60) comprises many photovoltaic modules (10) standing on edge and having four corners and a thickness, where each module includes a glass substrate having many photovoltaic cells (14) on a front surface, a back surface and an edge delete zone around the cells, a lamination layer of polyvinyl butyral over the front surface of the substrate and the photovoltaic cells, and a top glass layer. The modules are held upright by at least one clamp (64) having many grooves (67) sized to apply pressure on the back surface of the glass substrate in the direction of the top glass layer.    USE - The assembly is useful for processing photovoltaic modules (claimed).    ADVANTAGE - The assembly decreases frequency and severity of bubble defects during processing (i.e. lamination) of photovoltaic modules. The grooves minimize stress concentration on the modules.    DETAILED DESCRIPTION - Assembly (60) comprises many photovoltaic modules (10) standing on edge and having four corners and a thickness, where each module includes a glass substrate having many photovoltaic cells (14) on a front surface, a back surface and an edge delete zone around the cells, a lamination layer of polyvinyl butyral over the front surface of the substrate and the photovoltaic cells, and a top glass layer. The modules are held upright by at least one clamp (64) having many grooves (67) sized to apply pressure on the back surface of the glass substrate in the direction of the top glass layer such that pressure applied on the top glass layer is directed toward the glass substrate so as to apply compressive force to the module without causing damage to the module. An INDEPENDENT CLAIM is also included for processing many photovoltaic modules comprising: assembling a photovoltaic module having layers including a substrate having a back surface and a front surface, where many photovoltaic cells on the front surface of the substrate with an edge delete zone surround the photovoltaic cells on the front surface, and where the glass top is present over the lamination layer; assembling many photovoltaic modules in a first clamp, where the modules stand in an upright orientation, and have bottom and top edges, where the bottom edges are held by the first clamp, and where the first clamp has many grooves sized to apply compressive force to the modules without causing damage; applying a second clamp to the top edges of the modules, where the second clamp has grooves sized to apply compressive force to the modules without causing damage; and laminating the layers of the modules held in the clamps in an autoclave.    DESCRIPTION OF DRAWING(S) - The figure shows a partial perspective view of a stack of photovoltaic modules separated by clamp racks.    Photovoltaic modules (10)    Photovoltaic cells (14)    Assembly (60)    Clamp (64)    Grooves (67)