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Electrochromic WO3 thin films attain unprecedented durability by potentiostatic pretreatment
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0002-9885-3161
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Harbin Inst Technol, Sch Chem & Chem Engn, MIIT Key Lab Crit Mat Technol New Energy Convers, Harbin 150001, Heilongjiang, Peoples R China.ORCID iD: 0000-0002-3419-462x
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0001-8147-9778
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0002-7892-5260
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2019 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 7, no 6, p. 2908-2918Article in journal (Refereed) Published
Abstract [en]

Electrochromic windows and glass facades are able to impart energy efficiency jointly with indoor comfort and convenience. Long-term durability is essential for practical implementation of this technology and has recently attracted broad interest. Here we show that a simple potentiostatic pretreatment of sputterdeposited thin films of amorphous WO3-the most widely studied electrochromic material-can yield unprecedented durability for charge exchange and optical modulation under harsh electrochemical cycling in a Li-ion-conducting electrolyte and effectively evades harmful trapping of Li. The pretreatment consisted of applying a voltage of 6.0 V vs. Li/Li+ for several hours to a film backed by a transparent conducting In2O3: Sn layer. Associated compositional and structural modifications were probed by several techniques, and improved durability was associated with elemental intermixing at the WO3/ITO and ITO/glass boundaries as well as with carbonaceous solid-electrolyte interfacial layers on the WO3 films. Our work provides important new insights into long-term durability of ion-exchange-based devices.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2019. Vol. 7, no 6, p. 2908-2918
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Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-378529DOI: 10.1039/c8ta09621jISI: 000457893400054OAI: oai:DiVA.org:uu-378529DiVA, id: diva2:1298449
Funder
EU, European Research Council, 267234Swedish Research Council, 821-2012-5144Swedish Research Council, 2017-00646_9Swedish Foundation for Strategic Research , RIF14-0053Available from: 2019-03-22 Created: 2019-03-22 Last updated: 2019-03-22Bibliographically approved

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Arvizu, Miguel AQu, Hui-YingCindemir, UmutQiu, ZhenRojas González, Edgar AlonsoPrimetzhofer, DanielGranqvist, Claes GöranÖsterlund, LarsNiklasson, Gunnar

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Arvizu, Miguel AQu, Hui-YingCindemir, UmutQiu, ZhenRojas González, Edgar AlonsoPrimetzhofer, DanielGranqvist, Claes GöranÖsterlund, LarsNiklasson, Gunnar
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