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Photoconductivity of acid exfoliated and flash-light-processed MoS2 films
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för naturvetenskap.ORCID-id: 0000-0003-2873-7875
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för naturvetenskap.ORCID-id: 0000-0001-9137-3440
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för naturvetenskap.
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för elektronikkonstruktion.ORCID-id: 0000-0003-2965-0288
Vise andre og tillknytning
2018 (engelsk)Inngår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, artikkel-id 3296Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

MoS2 has been studied intensively during recent years as a semiconducting material in several fields, including optoelectronics, for applications such as solar cells and phototransistors. The photoresponse mechanisms of MoS2 have been discussed but are not fully understood, especially the phenomenon in which the photocurrent slowly increases. Here, we report on a study of the photoresponse flash-light-processed MoS2 films of different thicknesses and areas. The photoresponse of such films under different light intensities and bias voltages was measured, showing significant current changes with a quick response followed by a slow one upon exposure to pulsed light. Our in-depth study suggested that the slow response was due to the photothermal effect that heats the MoS2; this hypothesis was supported by the resistivity change at different temperatures. The results obtained from MoS2 films with various thicknesses indicated that the minority-carrier diffusion length was 1.36 mu m. This study explained the mechanism of the slow response of the MoS2 film and determined the effective thickness of MoS2 for a photoresponse to occur. The method used here for fabricating MoS2 films could be used for fabricating optoelectronic devices due to its simplicity.

sted, utgiver, år, opplag, sider
2018. Vol. 8, artikkel-id 3296
HSV kategori
Identifikatorer
URN: urn:nbn:se:miun:diva-33302DOI: 10.1038/s41598-018-21688-0ISI: 000425380900079PubMedID: 29459668Scopus ID: 2-s2.0-85061713034OAI: oai:DiVA.org:miun-33302DiVA, id: diva2:1191558
Tilgjengelig fra: 2018-03-19 Laget: 2018-03-19 Sist oppdatert: 2019-09-23bibliografisk kontrollert
Inngår i avhandling
1. Liquid-Phase Exfoliation of Two-Dimensional Materials: Applications, deposition methods and printed electronics on paper
Åpne denne publikasjonen i ny fane eller vindu >>Liquid-Phase Exfoliation of Two-Dimensional Materials: Applications, deposition methods and printed electronics on paper
2019 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

After the unprecedented success of graphene research, other materials that can also be exfoliated into thin layers, like Transition metal dichalcogenides (TMDs) such as molybdenum disulfide (MoS2), have also become the subjects of extensive studies. As one of the most promising methods for large scale production of such materials, liquid-phase exfoliation (LPE) has also been the subject of extensive research and is maturing as a field to the point that devices using additive manufacturing and printed nanosheets are often reported. The stability of the nanosheets in environmentally friendly solvents, particularly in water, with or without stabilizers, is still a focus of great interest for sustainable and commercial production. In this thesis, different methods of LPE in water with and without stabilizers are investigated and discussed. Stabilizers such as surfactant sodium dodecyl sulfate (SDS) and modified cellulose2-hydroxyethyl cellulose (HEC), were employed. Because waterdoes not have surface energy parameters that match those of2D materials, the dispersions in water do not usually have a high yield. Therefore, to circumvent the use of organic solvents that are known to be able to successfully exfoliate and stabilize nanosheets of two-dimensional materials, this thesis focuses on water as the solution-process medium for exfoliation and the assisting stabilizers used to keep the exfoliated nanomaterials in dispersion with a long half-time. Surfactant-assisted dispersions are discussed together with test-printing resultsusing inkjet to deposit the material. Process parameters for the LPE method using HEC as a stabilizer are presented together with thin nanosheets characterized by Raman spectroscopy. Dispersions using HEC presented the longest half-time among the studied methods, higher than previously reported values for methods using mixed low-boiling-point solvents. Devices using exfoliated nanosheets have been fabricated and presented in the present study. The photoconductivity of MoS2 using a device fabricated with LPE MoS2 nanosheets and the cathodoluminescence of LPE MoS2 are discussed. Although fabricated with mechanically exfoliated nanosheets and not LPE ones, another photodetector fabricated with one of the MoS2 grades used in this thesis is presented to highlight the excellent photoresponse of this material. A method of producing thin nanosheets with-out stabilizers by pre-processing the MoS2 grades withs and papers is introduced. With this method, nanosheets with a lateral size of around 200nm and a concentration around 0.14 g L−1 - that is half the concentration at the same processing conditions in solvent n-methyl pyrrolidone (NMP) - are discussed. Inkjet printing as a deposition method is discussed together with the requirements for the 2D inks. Printed organic electronics using the conductive polymer PEDOT:PSS are compared to those using commercially-available graphene ink, with a focus on printing on paper substrates. In order to bring the thesis into perspective from materials to device fabrication, I study the suitability of inkjet paper substrates for printed electronics, by extensively characterizing the chemical and physical properties of their ink-receiving layers (IRLs) and their impact on the electronic properties of the conductive printed lines.

sted, utgiver, år, opplag, sider
Sundsvall: Mid Sweden University, 2019. s. 125
Serie
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 305
Emneord
molybdenum disulfide (MoS2), transition metal dichalcogenide (TMD), thin films, inkjet printing, 2D inks, liquid-phase exfoliation, shear exfoliation, printed electronics, organic electronics, PEDOT:PSS, photoresponse, photocurrent, cathodoluminescence
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-37287 (URN)978-91-88947-19-2 (ISBN)
Disputas
2019-10-18, O102, Sundsvall, 10:15 (engelsk)
Opponent
Veileder
Merknad

Vid tidpunkten för disputationen var följande delarbete opublicerat: delarbete 3 (inskickat).

At the time of the doctoral defence the following paper was unpublished: paper 3 (submitted).

Tilgjengelig fra: 2019-09-23 Laget: 2019-09-23 Sist oppdatert: 2019-09-23bibliografisk kontrollert

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