All Silicon Electrode Photocapacitor for Integrated Energy Storage and Conversion

作者：Cohn Adam P; Erwin William R; Share Keith; Oakes Landon; Westover Andrew S; Carter Rachel E; Bardhan Rizia; Pint Cary L^*

来源：Nano Letters, 2015, 15(4): 2727-2731.

DOI：10.1021/acs.nanolett.5b00563

• Solar supercapacitor
• photocapacitor
• energy storage
• dye-sensitized solar cell
• supercapacitor
• porous silicon
• polymer electrolytes

We demonstrate a simple wafer-scale process by which an individual silicon wafer can be processed into a multifunctional platform where one side is adapted to replace platinum and enable triiodide reduction in a dye-sensitized solar cell and the other side provides on-board charge storage as an electrochemical supercapacitor. This builds upon electrochemical fabrication of dual-sided porous silicon and subsequent carbon surface passivation for silicon electrochemical stability. The utilization of this silicon multifunctional platform as a combined energy storage and conversion system yields a total device efficiency of 2.1%, where the high frequency discharge capability of the integrated supercapacitor gives promise for dynamic load-leveling operations to overcome current and voltage fluctuations during solar energy harvesting.

• 出版日期2015-4