TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The first vapor source station deposits one of selenium and sodium, and a second vapor station deposits the other of selenium and sodium onto the frontside of the continuous workpiece/flexible workpiece. The group IA material comprises sodium and the group VIA material comprises selenium. The precursor layer comprises copper, gallium and indium metals.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The system further comprises a third vapor source station disposed within the process chamber to deposit selenium onto the frontside of the continuous flexible workpiece. The moving assembly comprises a feed roller adjacent the input end and take-up roller adjacent the output end of the process chamber, where the continuous flexible workpiece is unwrapped from the feed roller and wrapped by the take-up roller. The components of the support assembly comprise a set of rollers that each contacts the backside of the continuous flexible workpiece. The set of rollers are aligned along a curved path, so that none of the components of the support assembly contact the frontside of the continuous flexible workpiece. Each roller tensions the continuous flexible workpiece by applying a pressure perpendicular to a backside portion where each roller touches. Preferred Process: The process further comprises depositing further group VIA material from a third vapor source station disposed within the process chamber to form another material layer over the second material layer. The forming the dopant structure occurs while moving the continuous workpiece. The first and second vapor source stations are maintained at a pressure of 10-4-10-6 Torr during the process. The components of the support assembly are cooled by a cooling system. Either the first material layer is formed from the group VIA material on the frontside of the continuous flexible workpiece and the second material layer is formed from the group IA material over the first material layer, or the first material layer is formed from the group IA material on the frontside of the continuous flexible workpiece and the second material layer is formed from the group VIA material over the first material layer.