Thin Films of Antimony-Tin Oxide as Counter-Electrodes for Proton Working Electrochromic Devices
Abstract
We report here on thin films proton-working electrochromic devices based on the well-known tungsten oxide as the coloring electrode, and Antimony Tin Oxide (ATO) as the ion-storage counter-electrode. We show that films deposited by Pulsed Laser Deposition (PLD) technique have an apparent Sb solubility up to 70 at %, and exhibit unusual electrochromic properties. Through potentiostatic tests we'll demonstrate that depending on the composition which influences film morphology, the Sn-Sb-O films could either present a faradic or a capacitive-like behavior, associated to a color or a neutral switching over a wide range of potentials, respectively. The structural properties of ATO films are characterized by X-ray diffraction and transmission electron microscopy (TEM). Electrochromic behavior is studied by means of cyclic voltamperometry coupled with ex situ optical transmittance measurements in the visible range. The maximum proton-storage capacity is observed for ATO films containing 40 - 50 at % Sb, while being quasi-neutral when switching over a wide range of potentials. These compositions are finally retained for the assembly of our WO3/proton-electrolyte/ATO devices, whose performances are reported.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2002
- Accession Number
- ADP012635
Entities
People
- A. Rougier
- C. Marcel
- J. M. Tarascon
- L. Dupont
- N. Naghavi
Organizations
- University of Picardie Jules Verne