LCS-FY2014-PP-03
PV power systems (Vol. 2):
Cost Estimates for High Efficiency Si-based Tandem Solar Cells Using Quantitative Technology Scenarios
Summary
This paper evaluates the important technology development items of high-efficiency silicon based tandem solar cells using our method to construct the quantitative technology scenarios which make it possible to estimate cost reduction and target completion time of the technologies. In the previous report, we analyzed the cost structure of various solar cell systems using the quantitative technology scenarios and proposed roadmap toward 2030. In this proposal, we propose required technologies to reduce the PV system cost as a result of our analysis.
We estimate the effects of cost reduction of PV technology, focusing on high-efficiency silicon based tandem solar cells which have advantage over resource constraints. We investigate wafer cutting process to reduce silicon consumption and tandem solar cells to improve power generation efficiency. As the material of the top layer of the tandem structure, we analyze perovskite, organic, and CIGS (Copper Indium Gallium Selenide), respectively. The cost reduction methods such as low-cost manufacturing process (coating, etc.) and selection of the inexpensive materials (organic etc.) are quantitatively evaluated. This paper proposes the importance of the setting up of the well-defined strategic technology target and its completion time.