NOVELTY - The apparatus has a support member (120B) including a roller i.e. front roller (121A), contacting a back surface (102B) along width of a continuous flexible work-piece (102). Another roller i.e. back roller (121B), includes end portions contacting edge regions (103A) of a front surface (102A). A central portion of the latter roller extends over a selected region located between the edge regions to form a gap between a surface of the selected region and the central portion of the latter roller. Leak flow (4F) leaking through an exit opening (114B) is flowed out through the gap of the member.    USE - Apparatus for electrodepositing a semiconductor material thin film of a group IBIIIAVIA compound photovoltaic cell e.g. amorphous silicon cell, cadmium telluride cell and copper indium gallium diselenide based solar cell, from binary, ternary and quaternary electrodeposition solution onto a front surface of a continuous flexible work piece e.g. metallic foil substrate such as rectangular sheet shaped continuous moving foil/web, when the flexible work piece is advanced through the apparatus in a roll to roll/in-line manner. Can also be used for an insulating foil/web, glass sheet, plastic sheet, aluminum/stainless steel foil and metal sheet.    ADVANTAGE - The apparatus allows electrodeposition of group IB, group IIIA materials and group VIA materials on a continuous flexible base to form precursor layers, which are converted into group IBIIIAVIA compound absorber layers by annealing at elevated temperature, thus developing roll-to-roll or in-line deposition techniques for growth of group IBIIIAVIA materials, and hence controlling critical IB/IIIA material composition. The apparatus utilizes a solution supply system including a flow regulator to reduce pressure of the solution provided to the chamber so as to reduce turbulence of the solution adjacent to a cathode, thus improving deposition efficiency and deposition uniformity of a depositing film. The apparatus utilizes a conductive layer to establish osmic contact between substrate diffusion barrier layers, thus preventing diffusion of impurities from a flexible foil substrate into the layers to be electrodeposited and into a photovoltaic cell layer during formation.    DETAILED DESCRIPTION - The apparatus utilizes a solution chamber made of corrosion resistant alloy, stainless steel, ceramic material and polymeric material such as PVC, polypropylene, polyethylene, polycarbonate and Teflon (RTM: PTFE).    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a support member for supporting a continuous flexible work piece of a roll-to-roll electrode position apparatus.    Leak flow (4F)    Continuous flexible work-piece (102)    Front surface (102A)    Back surface (102B)    Edge regions (103A)    Exit opening (114B)    Support member (120B)    Front roller (121A)    Back roller (121B)