1. International Technology Roadmap for Photovoltaic (ITRPV), Results,2019
2. A. Hwang, Global PV module capacity to expand to 234 GWp by year-end 2019, Digitimes Inc., https://www.digitimes .com/new/a20190426PD204/html.
3. PERC Cells: from Shortage to Surplus, PV-Magazine;Lin,2019
4. CRU Group: Silver Demand from Solar Panels has Peaked, https://investingnews.com/daily/resource-investing/precious-metals-investing/silver-investing/cru-group-solar-panel-silver-demand-peaked/.
5. High-efficiency crystalline silicon solar cells: status and perspectives;Battagli;Energy Environ. Sci.,2016