File(s) under permanent embargo
Electrical characterization of new electrochromic devices
conference contribution
posted on 2007-01-01, 00:00 authored by R Vergaz, D Barrios, J Sánchez-Pena, Cristina Pozo-GonzaloCristina Pozo-Gonzalo, J PomposoElectrochromic devices change their color and optical properties with applied voltage. A new symmetrical electrochromic configuration was constructed in previous works, where PEDOT acted as electrochromic layer or as counter electrode layer, depending on the polarity of the applied voltage. Devices of around 500mm2 and switching voltages from 0,5V to 2V are used in this work. Measured electrochemical impedance is fitted to an equivalent circuit based on a Randles cell, with Warburg impedance simulating ionic diffusion at low frequencies. Voltage dependence is analyzed for the first time in this kind of devices. Results show homogeneity problems in the contact layers, not seen in normal operation, and the voltage dependence on some construction parameters. This will be used to improve the devices construction, but improvements in the equivalent circuit should also be made. The proposed equivalent circuit is not valid after the redox reaction, from 1.5 to 2V.
History
Event
Spanish Conference on Electron Devices (6th : 2007 : Madrid, Spain)Pagination
150 - 153Publisher
IEEELocation
Madrid, SpainPlace of publication
Piscataway, N. J.Publisher DOI
Start date
2007-01-31End date
2007-02-02Language
engPublication classification
E1.1 Full written paper - refereedEditor/Contributor(s)
C Algora, V Corregidor, I Rey-StolleTitle of proceedings
Proceedings of the 6th Spanish Conference on Electron Devices 2007Usage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC