Issues in thin film PV manufacturing cost reduction

Abstract

Thin film PV technologies face a number of hurdles as they advance towards low-cost goals that are competitive with traditional sources of electricity. The US Department of Energy cost goal for thin films is about $0.33/W p, which is based on a module efficiency goal of about 15% and module manufacturing costs of about $50/m 2. This paper investigates the issues associated with achieving the $50/m 2 goal based on opportunities for manufacturing cost reductions. Key areas such as capital costs, deposition rates, layer thickness, materials costs, yields, substrates, and front and back end costs will be examined. Several prior studies support the potential of thin films to reach $50/m 2. This paper will examine the necessary process research improvements needed in amorphous silicon, copper indium diselenide, cadmium telluride, and experimental thin film silicon PV technologies to reach this ambitious goal. One major conclusion is that materials costs must be reduced because they will dominate in mature technologies. Another is that module efficiency could be the overriding parameter if different thin films each optimize their manufacturing to a similar level.