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Proceedings Paper

Embedding solar cell materials with on-board integrated energy storage for load-leveling and dark power delivery (Presentation Recording)
Author(s): Cary L. Pint; Andrew S. Westover; Adam P. Cohn; William R. Erwin; Keith Share; Thomas Metke; Rizia Bardhan

Paper Abstract

This work will discuss our recent advances focused on integrating high power energy storage directly into the native materials of both conventional photovoltaics (PV) and dye-sensitized solar cells (DSSCs). In the first case (PV), we demonstrate the ability to etch high surface-area porous silicon charge storage interfaces directly into the backside of a conventional polycrystalline silicon photovoltaic device exhibiting over 14% efficiency. These high surface area materials are then coupled with solid-state ionic liquid-polymer electrolytes to produce solid-state fully integrated devices where the PV device can directly inject charge into an on-board supercapacitor that can be separately discharged under dark conditions with a Coulombic efficiency of 84%. In a similar manner, we further demonstrate that surface engineered silicon materials can be utilized to replace Pt counterelectrodes in conventional DSSC energy conversion devices. As the silicon counterelectrodes rely strictly on surface Faradaic chemical reactions with the electrolyte on one side of the wafer electrode, we demonstrate double-sided processing of electrodes that enables dual-function of the material for simultaneous energy storage and conversion, each on opposing sides. In both of these devices, we demonstrate the ability to produce an all-silicon coupled energy conversion and storage system through the common ability to convert unused silicon in solar cells into high power silicon-based supercapacitors. Beyond the proof-of-concept design and performance of this integrated solar-storage system, this talk will conclude with a brief discussion of the hurdles and challenges that we envision for this emerging area both from a fundamental and technological viewpoint.

Paper Details

Date Published: 5 October 2015
PDF: 1 pages
Proc. SPIE 9562, Next Generation Technologies for Solar Energy Conversion VI, 95620F (5 October 2015); doi: 10.1117/12.2188503
Show Author Affiliations
Cary L. Pint, Vanderbilt University (United States)
Andrew S. Westover, Vanderbilt Univ. (United States)
Adam P. Cohn, Vanderbilt Univ. (United States)
William R. Erwin, Vanderbilt Univ. (United States)
Keith Share, Vanderbilt Univ. (United States)
Thomas Metke, Vanderbilt Univ. (United States)
Rizia Bardhan, Vanderbilt Univ. (United States)


Published in SPIE Proceedings Vol. 9562:
Next Generation Technologies for Solar Energy Conversion VI
Oleg V. Sulima; Gavin Conibeer, Editor(s)

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