A wafer-based monocrystalline silicon photovoltaics road map: Utilizing known technology improvement opportunities for further reductions in manufacturing costs

• Published in: Solar energy materials and solar cells 2013-07, Vol.114, p.110-135
• Main Authors: Goodrich, Alan, Hacke, Peter, Wang, Qi, Sopori, Bhushan, Margolis, Robert, James, Ted L., Woodhouse, Michael
• Format: Article
• Language: English
• Subjects: Applied sciences; Crystalline silicon; Direct energy conversion and energy accumulation; Economics; Electrical engineering. Electrical power engineering; Electrical power engineering; Energy; Exact sciences and technology; Natural energy; Photoelectric conversion; Photovoltaic conversion; Photovoltaics; Solar cells. Photoelectrochemical cells; Solar energy; Solar radiation
• ISSN: 0927-0248; 1879-3398
• DOI: 10.1016/j.solmat.2013.01.030

As an initial investigation into the current and potential economics of one of today's most widely deployed photovoltaic technologies, we have engaged in a detailed analysis of manufacturing costs for each step within the wafer-based monocrystalline silicon (c-Si) PV module supply chain. At each step we find several pathways that could lead to further reductions in manufacturing costs. After aggregating the performance and cost considerations for a series of known technical improvement opportunities, we project a pathway for commercial-production c-Si modules to have typical sunlight power conversion efficiencies of 19–23%, and we calculate that they might be sustainably sold at ex-factory gate prices of $0.60–$0.70 per peak Watt (DC power, current U.S. dollars). This may not be the lower bound to the cost curve for c-Si, however, because the roadmap described in this paper is constrained by the boundary conditions set by the wire sawing of wafers and their incorporation into manufacturing equipment that is currently being developed for commercial-scale production. Within these boundary conditions, we find that the benefit of reducing the wafer thickness from today's standard 180μm to the handling limit of 80μm could be around $0.05 per peak Watt (Wp), when the calculation is run at minimum sustainable polysilicon prices (which we calculate to be around $23/kg). At that minimum sustainable polysilicon price, we also calculate that the benefit of completely eliminating or completely recycling kerf loss could be up to $0.08/Wp. These downward adjustments to the long run wafer price are used within the cost projections for three advanced cell architectures beyond today's standard c-Si solar cell. Presumably, the higher efficiency cells that are profiled must be built upon a foundation of higher quality starting wafers. The prevailing conventional wisdom is that this should add cost at the ingot and wafering step—either due to lower production yields when having to sell wafers that are doped with an alternative element other than the standard choice of boron, or in additional capital equipment costs associated with removing problematic boron–oxygen pairs. However, from our survey it appears that there does not necessarily need to be an assumption of a higher wafer price if cell manufacturers should wish to use n-type wafers derived from the phosphorus dopant. And as for making p-type wafers with the traditional boron dopant, the potential price premium for hig