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Granqvist, Claes Göran
Alternative names
Publications (10 of 534) Show all publications
Granqvist, C. G., Arvizu, M. A., Qu, H.-Y., Wen, R.-T. & Niklasson, G. (2019). Advances in electrochromic device technology: Multiple roads towards superior durability. Paper presented at 61st Annual Technical Conference of the Society-of-Vacuum-Coaters (SVC), MAY 05-10, 2018 , Orlando, FL, USA.. Surface & Coatings Technology, 357, 619-625
Open this publication in new window or tab >>Advances in electrochromic device technology: Multiple roads towards superior durability
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2019 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 357, p. 619-625Article in journal (Refereed) Published
Abstract [en]

Most electrochromic (EC) devices must have a service lifetime of many years, and this is particularly so for“smart windows” in buildings with good energy efficiency and indoor comfort. The central part of oxide-based EC devices contains thin films based on W oxide and Ni oxide together with an interposed electrolyte. Depending on operating conditions, these films may show degradation at a slower or faster pace, and means to prevent or reverse this phenomenon, or as a minimum allow reliable lifetime prediction, have been sought ever since the beginnings of EC technology. Here we survey recent endeavors related to EC films of W oxide and Ni oxide and show that (i) electrochemical pretreatment of films in a liquid electrolyte can significantly improve durability, (ii)electrochemical posttreatment in a liquid electrolyte can rejuvenate degraded films, (iii) mixed oxides can have better durability and optical performance than corresponding pure oxides, and (iv) lifetime prediction is possible.

Place, publisher, year, edition, pages
Elsevier, 2019
National Category
Materials Chemistry
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-369882 (URN)10.1016/j.surfcoat.2018.10.048 (DOI)000455691100083 ()
Conference
61st Annual Technical Conference of the Society-of-Vacuum-Coaters (SVC), MAY 05-10, 2018 , Orlando, FL, USA.
Funder
EU, European Research Council, 267234
Available from: 2018-12-17 Created: 2018-12-17 Last updated: 2019-02-05Bibliographically approved
Bayrak Pehlivan, I., Atak, G., Stolt, O., Granqvist, C. G., Niklasson, G., Stolt, L. & Edvinsson, T. (2019). Bifunctional Solar Electrocatalytic Water Splitting using CIGS Solar Modules and WO3-Based Electrolyzers. In: : . Paper presented at European Materials Research Society (E-MRS) Spring Meeting, Nice, France, 27–31 May, 2019 (pp. 1-1).
Open this publication in new window or tab >>Bifunctional Solar Electrocatalytic Water Splitting using CIGS Solar Modules and WO3-Based Electrolyzers
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2019 (English)Conference paper, Published paper (Other academic)
Series
Abstracts
National Category
Condensed Matter Physics Energy Systems
Research subject
Engineering Science with specialization in Materials Science
Identifiers
urn:nbn:se:uu:diva-398783 (URN)
Conference
European Materials Research Society (E-MRS) Spring Meeting, Nice, France, 27–31 May, 2019
Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2020-04-23Bibliographically approved
Cindemir, U., Topalian, Z., Granqvist, C. G., Österlund, L. & Niklasson, G. (2019). Characterization of nanocrystalline-nanoporous nickel oxide thin films prepared by reactive advanced gas deposition. Materials Chemistry and Physics, 227, 98-104
Open this publication in new window or tab >>Characterization of nanocrystalline-nanoporous nickel oxide thin films prepared by reactive advanced gas deposition
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2019 (English)In: Materials Chemistry and Physics, ISSN 0254-0584, E-ISSN 1879-3312, Vol. 227, p. 98-104Article in journal (Refereed) Published
Abstract [en]

Nanocrystalline-nanoporous Ni oxide is of much interest for gas sensors and other applications. Reactive advanced gas deposition (AGD) stands out as a particularly promising technique for making thin films of this material owing to the techniques ability to separate between the growth of individual nanoparticles and their subsequent deposition to create a consolidated material on a substrate. Here we report on the characterization of Ni oxide films, made by reactive AGD, by several methods. X-ray diffractometry showed that the films had a face centered cubic NiO structure, and scanning electron microscopy indicated a compact nanoparticulate composition. X-ray photoelectron spectroscopy showed the presence of Ni3+ and demonstrated that these states became less prominent upon heat treatment in air. Extended x-ray absorption fine structure analysis elucidated the local atomic structure; in particular, data on interatomic distances and effects of annealing on local disorder showed that the Ni oxide nanoparticles crystallize upon annealing while maintaining their nanoparticle morphology, which is a crucial feature for reproducible fabrication of Ni oxide thin films for gas sensors. Importantly, several techniques demonstrated that grain growth remained modest for annealing temperatures as high as 400 degrees C for 1700-nm-thick films. The present article is a sequel to an earlier one [U. Cindemir et al., Sensors and Actuators B 242 (2017) 132-139] in which we reported on fluctuation-enhanced and conductometric gas sensing with Ni oxide films prepared by AGD.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA, 2019
Keywords
Nickel oxide, Advanced gas deposition, EXAFS, Atomic structure, Gas sensor
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-387223 (URN)10.1016/j.matchemphys.2019.01.058 (DOI)000466617800013 ()
Funder
EU, FP7, Seventh Framework Programme, 267234
Available from: 2019-06-25 Created: 2019-06-25 Last updated: 2020-04-14Bibliographically approved
Sittinger, V., Bosch, R., Granqvist, C. G., Sanchez, D., Shimshock, R. & Andreasen, M. (2019). Coatings for Energy Conversion and Related Processes. In: SVC, 62nd annual technical conference proceedings: . Paper presented at SVC Society of Vacuum Coaters, April 27 - May 2, 2019, Long Beach, CA, USA (pp. 1-11).
Open this publication in new window or tab >>Coatings for Energy Conversion and Related Processes
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2019 (English)In: SVC, 62nd annual technical conference proceedings, 2019, p. 1-11Conference paper, Published paper (Refereed)
National Category
Condensed Matter Physics Energy Systems
Research subject
Engineering Science with specialization in Materials Science
Identifiers
urn:nbn:se:uu:diva-398786 (URN)
Conference
SVC Society of Vacuum Coaters, April 27 - May 2, 2019, Long Beach, CA, USA
Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2020-04-24Bibliographically approved
Niklasson, G. & Granqvist, C. G. (2019). Electrochromic and Thermochromic Oxide Materials. Applied Surface Science, 482, 70-72
Open this publication in new window or tab >>Electrochromic and Thermochromic Oxide Materials
2019 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 482, p. 70-72Article in journal (Other academic) Published
National Category
Condensed Matter Physics Energy Systems
Research subject
Engineering Science with specialization in Materials Science
Identifiers
urn:nbn:se:uu:diva-398772 (URN)10.1016/j.apsusc.2017.11.255 (DOI)
Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2020-02-07Bibliographically approved
Atak, G., Montero Amenedo, J., Bayrak Pehlivan, I., Granqvist, C. G. & Niklasson, G. (2019). Electrochromic Performance of WO3 Films with Different ITO Layers. In: : . Paper presented at European Materials Research Society (E-MRS) Spring Meeting, Nice, France, 27–31 May, 2019 (pp. 1-1).
Open this publication in new window or tab >>Electrochromic Performance of WO3 Films with Different ITO Layers
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2019 (English)Conference paper, Published paper (Other academic)
Series
Abstracts
National Category
Condensed Matter Physics
Research subject
Engineering Science with specialization in Materials Science
Identifiers
urn:nbn:se:uu:diva-398782 (URN)
Conference
European Materials Research Society (E-MRS) Spring Meeting, Nice, France, 27–31 May, 2019
Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2020-04-29Bibliographically approved
Arvizu, M. A., Qu, H.-Y., Cindemir, U., Qiu, Z., Rojas González, E. A., Primetzhofer, D., . . . Niklasson, G. (2019). Electrochromic WO3 thin films attain unprecedented durability by potentiostatic pretreatment. Journal of Materials Chemistry A, 7(6), 2908-2918
Open this publication in new window or tab >>Electrochromic WO3 thin films attain unprecedented durability by potentiostatic pretreatment
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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
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-378529 (URN)10.1039/c8ta09621j (DOI)000457893400054 ()
Funder
EU, European Research Council, 267234Swedish Research Council, 821-2012-5144Swedish Research Council, 2017-00646_9Swedish Foundation for Strategic Research , RIF14-0053
Available from: 2019-03-22 Created: 2019-03-22 Last updated: 2019-03-22Bibliographically approved
Sorar, I., Rojas-González, E., Bayrak Pehlivan, I., Granqvist, C. G. & Niklasson, G. (2019). Electrochromism of W–Ti Oxide Films: Cycling Durability, Potentiostatic Rejuvenation, and Modeling of Electrochemical Degradation. Journal of the Electrochemical Society, 166, H795-H801
Open this publication in new window or tab >>Electrochromism of W–Ti Oxide Films: Cycling Durability, Potentiostatic Rejuvenation, and Modeling of Electrochemical Degradation
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2019 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 166, p. H795-H801Article in journal (Other academic) Published
Abstract [en]

Thin films of electrochromic W oxide and W–Ti oxide were prepared by reactive DC magnetron sputtering and were cycled voltammetrically in an electrolyte of lithium perchlorate in propylene carbonate. Film degradation was studied for up to 500 voltammetric cycles in voltage ranges between 1.5–4.0 and 2.0–4.0 V vs. Li/Li+. Optically and electrochemically degraded films were subjected to potentiostatic posttreatment at 6.0 V vs. Li/Li+ to achieve ion de-trapping and rejuvenation so that the films partly regained their original properties. Ti incorporation and potentiostatic posttreatment jointly yielded superior electrochromic properties provided the lower limit of the voltage range was above 1.6–1.7 V vs. Li/Li+. Degradation dynamics for as-deposited and rejuvenated thin films was modeled successfully by power-law kinetics; this analysis indicated coexistence of two degradation mechanisms, one based on dispersive chemical kinetics and operating universally and another, of unknown origin, rendered inactive by rejuvenation. The results of the present study are of large interest for the development of electrochromic devices with exceptional durability.

National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Materials Science
Identifiers
urn:nbn:se:uu:diva-398775 (URN)10.1149/2.0421915jes (DOI)
Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2020-02-14Bibliographically approved
Sorar, I., Rojas González, E. A., Bayrak Pehlivan, I., Granqvist, C. G. & Niklasson, G. (2019). Electrochromism of W–Ti Oxide Thin Films: Cycling Durability,Potentiostatic Rejuvenation, and Modelling of Electrochemical Degradation. Journal of the Electrochemical Society, 166(15), H795-H801
Open this publication in new window or tab >>Electrochromism of W–Ti Oxide Thin Films: Cycling Durability,Potentiostatic Rejuvenation, and Modelling of Electrochemical Degradation
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2019 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 166, no 15, p. H795-H801Article in journal (Refereed) Published
Abstract [en]

Thin films of electrochromicWoxide and W–Ti oxide were prepared by reactive DC magnetron sputtering and were cycled voltammetrically in an electrolyte of lithium perchlorate in propylene carbonate. Film degradation was studied for up to 500 voltammetric cycles in voltage ranges between 1.5–4.0 and 2.0–4.0 V vs. Li/Li+. Optically and electrochemically degraded films were subjected to potentiostatic posttreatment at 6.0 V vs. Li/Li+ to achieve ion de-trapping and rejuvenation so that the films partly regained their original properties. Ti incorporation and potentiostatic posttreatment jointly yielded superior electrochromic properties provided the lower limit of the voltage range was above 1.6–1.7 V vs. Li/Li+. Degradation dynamics for as-deposited and rejuvenated thin films was modeled successfully by power-law kinetics; this analysis indicated coexistence of two degradation mechanisms, one based on dispersive chemical kinetics and operating universally and another, of unknown origin, rendered inactive by rejuvenation. The results of the present study are of large interest for the development of electrochromic devices with exceptional durability.

Place, publisher, year, edition, pages
Electrochemical Society, 2019
National Category
Condensed Matter Physics
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-397482 (URN)DOI: 10.1149/2.0421915jes (DOI)000494283100001 ()
Funder
Swedish Research Council, VR-2016-03713Swedish Research Council, 2017-00646-9Swedish Foundation for Strategic Research , RIF14-0053
Available from: 2019-11-20 Created: 2019-11-20 Last updated: 2019-11-22Bibliographically approved
Engfeldt, J. D., Gregard, G., Niklasson, G., Roos, A. & Granqvist, C. G. (2019). Glazing for Energy Efficient Buildings: The Almost Forgotten Role of Angular-Dependent Solar Transmittance. In: Society of Vacuum Coaters 2019 Technical Conference Proceedings: Coatings for Energy Conversion and related Processes. Paper presented at Society of Vacuum Coaters 2019 Technical Conference, Long beach, CA, USA, April 27 - May 2, 2019. Society of Vacuum Coaters, Article ID 0018.
Open this publication in new window or tab >>Glazing for Energy Efficient Buildings: The Almost Forgotten Role of Angular-Dependent Solar Transmittance
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2019 (English)In: Society of Vacuum Coaters 2019 Technical Conference Proceedings: Coatings for Energy Conversion and related Processes, Society of Vacuum Coaters , 2019, article id 0018Conference paper, Published paper (Refereed)
Abstract [en]

Glazing for energy efficient buildings comprises multi-pane units with surface coated glass. According to today’s standards, glazing is characterized by optical measurements at normal light incidence. Here we show that this prerequisite is grossly inadequate for common vertical glazing, in particular regarding solar transmittance and total energy transmittance (g-value). We present data on spectral and angular-dependent transmittance in the 300–2500-nm wavelength range for several types of glass samples with hard (tin-oxide-based) and soft (silver-based) coatings. Furthermore, we use standard procedures to compute g-values for triple-pane glazing embodying such glass and find that the g-value at 60° off-normal angle typically is as low as 65–68% of the g-value for normal incidence. This difference is essential for assessing the energy efficiency of modern buildings and highlights that the glazing’s angularity must be accounted for.

Place, publisher, year, edition, pages
Society of Vacuum Coaters, 2019
National Category
Building Technologies Condensed Matter Physics
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-395338 (URN)10.14332/svc19.proc.0018 (DOI)
Conference
Society of Vacuum Coaters 2019 Technical Conference, Long beach, CA, USA, April 27 - May 2, 2019
Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2020-05-19Bibliographically approved
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