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Delekta, Szymon SollamiORCID iD iconorcid.org/0000-0001-9329-9088
Publications (5 of 5) Show all publications
Delekta, S. S., Adolfsson, K. H., Benyahia Erdal, N., Hakkarainen, M., Östling, M. & Li, J. (2019). Fully inkjet printed ultrathin microsupercapacitors based on graphene electrodes and a nano-graphene oxide electrolyte. Nanoscale, 11(21), 10172-10177
Open this publication in new window or tab >>Fully inkjet printed ultrathin microsupercapacitors based on graphene electrodes and a nano-graphene oxide electrolyte
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2019 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 11, no 21, p. 10172-10177Article in journal (Refereed) Published
Abstract [en]

The advance of miniaturized and low-power electronics has a striking impact on the development of energy storage devices with constantly tougher constraints in terms of form factor and performance. Microsupercapacitors (MSCs) are considered a potential solution to this problem, thanks to their compact device structure. Great efforts have been made to maximize their performance with new materials like graphene and to minimize their production cost with scalable fabrication processes. In this regard, we developed a full inkjet printing process for the production of all-graphene microsupercapacitors with electrodes based on electrochemically exfoliated graphene and an ultrathin solid-state electrolyte based on nano-graphene oxide. The devices exploit the high ionic conductivity of nano-graphene oxide coupled with the high electrical conductivity of graphene films, yielding areal capacitances of up to 313 mu F cm-2 at 5 mV s-1 and high power densities of up to 4 mW cm-3 with an overall device thickness of only 1 mu m.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-254076 (URN)10.1039/c9nr01427f (DOI)000470697800002 ()31107494 (PubMedID)2-s2.0-85066626832 (Scopus ID)
Note

QC 20190624

Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-08-16Bibliographically approved
Loiko, P., Maria Serres, J., Delekta, S. S., Kifle, E., Mateos, X., Baranov, A., . . . Östling, M. (2017). Inkjet-Printing of Graphene Saturable Absorbers for similar to 2 mu m Bulk and Waveguide Lasers. In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO): . Paper presented at Conference on Lasers and Electro-Optics (CLEO), MAY 14-19, 2017, San Jose, CA. IEEE
Open this publication in new window or tab >>Inkjet-Printing of Graphene Saturable Absorbers for similar to 2 mu m Bulk and Waveguide Lasers
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2017 (English)In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE , 2017Conference paper, Published paper (Refereed)
Abstract [en]

We report on inkjet-printing of graphene saturable absorbers (SAs) suitable for passive Q-switching of similar to 2-mu m bulk and waveguide lasers. Using graphene-SA in a microchip Tm:KLu(WO4)(2) laser, 1.2 mu J/136 ns pulses are generated at 1917 nm.

Place, publisher, year, edition, pages
IEEE, 2017
Series
Conference on Lasers and Electro-Optics, ISSN 2160-9020
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-226251 (URN)000427296202314 ()978-1-9435-8027-9 (ISBN)
Conference
Conference on Lasers and Electro-Optics (CLEO), MAY 14-19, 2017, San Jose, CA
Note

QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-05-29Bibliographically approved
Li, J., Delekta, S. S., Zhang, P., Yang, S., Lohe, M. R., Zhuang, X., . . . Östling, M. (2017). Scalable Fabrication and Integration of Graphene Microsupercapacitors through Full Inkjet Printing. ACS Nano, 11(8), 8249-8256
Open this publication in new window or tab >>Scalable Fabrication and Integration of Graphene Microsupercapacitors through Full Inkjet Printing
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2017 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 11, no 8, p. 8249-8256Article in journal (Refereed) Published
Abstract [en]

A simple full-inkjet-printing technique is developed for the scalable fabrication of graphene-based microsupercapacitors (MSCs) on various substrates. High-performance graphene inks are formulated by integrating the electrochemically exfoliated graphene with a solvent exchange technique to reliably print graphene interdigitated electrodes with tunable geometry and "thickness. Along with the printed polyelectrolyte, poly(4-styrenesulfonic acid), the fully printed graphene-based MSCs attain the highest areal capacitance of similar to 0.7 mF/cm(2), substantially advancing the state-of-art of all-solid-state MSCs with printed graphene electrodes. The full printing solution enables scalable fabrication of MSCs and effective connection of them in parallel and/or in series at various scales. Remarkably, more than 100 devices have been connected to form large-scale MSC arrays as power banks on both silicon wafers and Kapton. Without any extra protection or encapsulation, the MSC arrays can be reliably charged up to 12 V and retain the performance even 8 months after fabrication.

National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-214515 (URN)10.1021/acsnano.7b03354 (DOI)000408520900076 ()28682595 (PubMedID)2-s2.0-85028458614 (Scopus ID)
Note

QC 20170929

Available from: 2017-09-29 Created: 2017-09-29 Last updated: 2019-08-16Bibliographically approved
Östling, M., Smith, A., Vaziri, S., Delekta, S. S., Li, J. & Lemme, M. C. (2016). Emerging graphene device technologies. In: Emerging Nanomaterials and Devices: . Paper presented at Symposium on Emerging Nanomaterials and Devices - PRiME 2016/230th ECS Meeting, Honolulu, United States, 2 October 2016 through 7 October 2016 (pp. 17-35). Electrochemical Society, 75(13), Article ID 13.
Open this publication in new window or tab >>Emerging graphene device technologies
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2016 (English)In: Emerging Nanomaterials and Devices, Electrochemical Society, 2016, Vol. 75, no 13, p. 17-35, article id 13Conference paper, Published paper (Refereed)
Abstract [en]

Graphene has a wide range of attractive electrical and mechanical properties. This unique blend of properties make it a good candidate for emerging and future device technologies, such as sensors, high frequency electronics, and energy storage devices. In this review paper, each of the aforementioned applications will be explored along with demonstrations of their operating principles. Specifically, we explore pressure and humidity sensors, graphene base transistor for high frequency applications, and supercapacitors. In addition, this paper provides a general overview of these graphene technologies and, in the case of pressure and humidity sensors, benchmarking against other competing technologies. This paper further shows possible and prospective paths that are suitable for future graphene research to take.

Place, publisher, year, edition, pages
Electrochemical Society, 2016
Series
ECS Transactions, ISSN 1938-5862 ; 75
Keywords
Graphene, Graphene transistors, Humidity sensors, Nanostructured materials, Competing technologies, Device technologies, Electrical and mechanical properties, High-frequency applications, High-frequency electronics, Operating principles, Review papers, Super capacitor, Graphene devices
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-195484 (URN)10.1149/07513.0017ecst (DOI)000406653800003 ()2-s2.0-84991503834 (Scopus ID)9781607685395 (ISBN)
Conference
Symposium on Emerging Nanomaterials and Devices - PRiME 2016/230th ECS Meeting, Honolulu, United States, 2 October 2016 through 7 October 2016
Funder
Swedish Research Council, 2014-6160EU, European Research Council, 641416Stiftelsen Olle Engkvist Byggmästare, 2014/799Vinnova, 2015-01337
Note

QC 20161125

Available from: 2016-11-25 Created: 2016-11-03 Last updated: 2019-12-10Bibliographically approved
Zhao, Y., Lobov, G., Sugunan, A., Karlsson, M., Marinins, A., Delekta, S. S., . . . Toprak, M. S.Electrical Field Induced Alignment of P3HT Nanofibers.
Open this publication in new window or tab >>Electrical Field Induced Alignment of P3HT Nanofibers
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Abstract: Poly 3-hexylthiophene (P3HT) is one of the most studied conjugated polymers for organic solar cell applications due to its light weight, flexible processing methods and low cost fabrication. However, the hole mobility in P3HT is still relatively low compared to that of the inorganic semiconductors, which is one of the main challenges to achieve better performance of organic solar cells. The P3HT nanofibers with aligned by inducing an external electric field have been studied to improve the hole mobility in P3HT nanofibers. Here we present an AC electric field (1.3 V/µm, 50 Hz) induced alignment of P3HT nanofibers with two different lengths. The optical absorption spectra of aligned nanofibers were measured under different polarizations of incident light. The longer nanofibers showed higher dichroic raitos than that of shorter nanofibers, revealing a better alignment pattern. The photoconductivity of non-aligned and aligned P3HT nanofibers were measured and compared, where the aligned P3HT nanofibers showed a ~270% higher dark current than that of non-aligned sample. Moreover, the current measured under the illumination showed ~110% enhancement in the aligned P3HT nanofibers while only ~70% enhancement was obseved in non-aligned nanofibers, revealing that the alignment process have the potential to improve the mobility for optoelectronic applications. 

Keywords
P3HT nanofibers, electric field induced alignment, J-V measurement
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-187315 (URN)
Note

QC 20160520

Available from: 2016-05-19 Created: 2016-05-19 Last updated: 2016-05-20Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0001-9329-9088

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