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Open Access Nano Express

Micro-ultracapacitors with highly doped silicon nanowires electrodes

Fleur Thissandier13, Nicolas Pauc3, Thierry Brousse34, Pascal Gentile23* and Saïd Sadki13

Author Affiliations

1 Laboratory for Molecular Electronics Organic & Hybrid (LEMOH)-SPrAM UMR 5819 (CEA,CNRS, UJF), Grenoble, 38054, France

2 SiNaPS Laboratory SP2M, UMR-E CEA/UJF-Grenoble 1, Grenoble, 38054, France

3 Commisioner for Atomic Energy and Alternative Energies (CEA) Grenoble/INAC 17 Rue des Martyrs, Grenoble Cedex 9, 38054, France

4 Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, 2 Rue de la Houssinière, BP32229, Nantes, Cedex 3, 44322, France

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Nanoscale Research Letters 2013, 8:38  doi:10.1186/1556-276X-8-38

Published: 21 January 2013

Abstract

Highly n-doped silicon nanowires (SiNWs) with several lengths have been deposited via chemical vapor deposition on silicon substrate. These nanostructured silicon substrates have been used as electrodes to build symmetrical micro-ultracapacitors. These devices show a quasi-ideal capacitive behavior in organic electrolyte (1 M NEt4BF4 in propylene carbonate). Their capacitance increases with the length of SiNWs on the electrode and has been improved up to 10 μFcm−2 by using 20 μm SiNWs, i.e., ≈10-fold bulk silicon capacitance. This device exhibits promising galvanostatic charge/discharge cycling stability with a maximum power density of 1.4 mW cm−2.

Keywords:
Ultracapacitor; Electrochemical capacitor; Silicon nanowires electrodes; Chemical vapor deposition; Cyclic voltammetry; Galvanostatic charge/discharge; Microdevice