title: All silicon electrode photocapacitor for integrated energy storage and conversion.
abstract: 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.
authors: †Department of Mechanical Engineering, ‡Interdisciplinary Materials Science Program, and §Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States.
authors: Adam P
authors: AP
authors: Cohn
authors: †Department of Mechanical Engineering, ‡Interdisciplinary Materials Science Program, and §Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States.
authors: William R
authors: WR
authors: Erwin
authors: †Department of Mechanical Engineering, ‡Interdisciplinary Materials Science Program, and §Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States.
authors: Keith
authors: K
authors: Share
authors: †Department of Mechanical Engineering, ‡Interdisciplinary Materials Science Program, and §Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States.
authors: Landon
authors: L
authors: Oakes
authors: †Department of Mechanical Engineering, ‡Interdisciplinary Materials Science Program, and §Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States.
authors: Andrew S
authors: AS
authors: Westover
authors: †Department of Mechanical Engineering, ‡Interdisciplinary Materials Science Program, and §Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States.
authors: Rachel E
authors: RE
authors: Carter
authors: †Department of Mechanical Engineering, ‡Interdisciplinary Materials Science Program, and §Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States.
authors: Rizia
authors: R
authors: Bardhan
authors: †Department of Mechanical Engineering, ‡Interdisciplinary Materials Science Program, and §Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States.
authors: Cary L
authors: CL
authors: Pint
keywords: Solar supercapacitor; dye-sensitized solar cell; energy storage; photocapacitor; polymer electrolytes; porous silicon; supercapacitor