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Setup for simultaneous electrochemical and color impedance measurements of electrochromic films: Theory, assessment, and test measurement
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0003-0393-0273
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.ORCID iD: 0000-0002-8279-5163
2019 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 90, no 8, article id 085103Article in journal (Refereed) Published
Abstract [en]

Combined frequency-resolved techniques are suitable to study electrochromic (EC) materials. We present an experimental setup for simultaneous electrochemical and color impedance studies of EC systems in transmission mode and estimate its frequency-dependent uncertainty by measuring the background noise. We define the frequency-dependent variables that are relevant to the combined measurement scheme, and a special emphasis is given to the complex optical capacitance and the complex differential coloration efficiency, which provide the relation between the electrical and optical responses. Results of a test measurement on amorphous WO3 with LED light sources of peak wavelengths of 470, 530, and 810 nm are shown and discussed. In this case, the amplitude of the complex differential coloration efficiency presented a monotonous increase down to about 0.3 Hz and was close to a constant value for lower frequencies. We study the effect of the excitation voltage amplitude on the linearity of the electrical and optical responses for the case of amorphous WO3 at 2.6 V vs Li/Li+, where a trade-off should be made between the signal-to-noise ratio (SNR) of the optical signal and the linearity of the system. For the studied case, it was possible to increase the upper accessible frequency of the combined techniques (defined in this work as the upper threshold of the frequency region for which the SNR of the optical signal is greater than 5) from 11.2 Hz to 125.9 Hz while remaining in the linear regime with a tolerance of less than 5%. (C) 2019 Author(s).

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2019. Vol. 90, no 8, article id 085103
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
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URN: urn:nbn:se:uu:diva-394164DOI: 10.1063/1.5115119ISI: 000483885600066PubMedID: 31472623OAI: oai:DiVA.org:uu-394164DiVA, id: diva2:1359381
Funder
Swedish Research Council, VR-2016-03713Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-09Bibliographically approved

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The full text will be freely available from 2020-09-01 11:13
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Rojas González, Edgar AlonsoNiklasson, Gunnar

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