Revealing the nature of excitons in liquid exfoliated monolayer tungsten disulphide

Kłopotowski Łukasz; Backes Claudia; Mitioglu Anatolie; Vega-Mayoral Victor; Hanlon Damien; Coleman Jonathan N.; Ivanov Vitalii; Maude Duncan Kennedy; Płochocka Paulina

Conţinutul numărului revistei

Articolul precedent

Articolul urmator

861

SM ISO690:2012

KŁOPOTOWSKI, Łukasz, BACKES, Claudia, MITIOGLU, Anatolie, VEGA-MAYORAL, Victor, HANLON, Damien, COLEMAN, Jonathan N., IVANOV, Vitalii, MAUDE, Duncan Kennedy, PŁOCHOCKA, Paulina. Revealing the nature of excitons in liquid exfoliated monolayer tungsten disulphide. In: Nanotechnology, 2016, vol. 27, pp. 510-518. ISSN 0957-4484. DOI: https://doi.org/10.1088/0957-4484/27/42/425701

EXPORT metadate:
Google Scholar
Crossref
CERIF

DataCite
Dublin Core

Nanotechnology

Volumul 27 / 2016 / ISSN 0957-4484

Revealing the nature of excitons in liquid exfoliated monolayer tungsten disulphide

DOI:https://doi.org/10.1088/0957-4484/27/42/425701

Pag. 510-518

Kłopotowski Łukasz¹, Backes Claudia²³, Mitioglu Anatolie⁴⁵⁶, Vega-Mayoral Victor⁷, Hanlon Damien², Coleman Jonathan N.², Ivanov Vitalii¹, Maude Duncan Kennedy⁵, Płochocka Paulina⁵

¹ Institute of Physics PAN,
² School of Physics, CRANN, AMBER, Trinity College Dublin, Dublin 2,
³ University of Heidelberg,
⁴ Institute of Applied Physics, Academy of Sciences of Moldova,
⁵ LNCMI, CNRS-UJF-UPS-INSA, Grenoble and Toulouse,
⁶ High Field Magnet Laboratory, Institute for Molecules and Materials, Radboud University,
⁷ Jozef Stefan Institute

Disponibil în IBN: 23 noiembrie 2017

Rezumat

Transition metal dichalcogenides (TMD) hold promise for applications in novel optoelectronic devices. There is therefore a need for materials that can be obtained in large quantities and with well understood optical properties. In this report, we present thorough photoluminescence (PL) investigations of monolayer tungsten disulphide obtained via liquid phase exfoliation. As shown by microscopy studies, the exfoliated nanosheets have dimensions of tens of nanometers and thickness of 2.5 monolayers on average. The monolayer content is about 20%. Our studies show that at low temperature the PL is dominated by excitons localized on nanosheet edges. As a consequence, the PL is strongly sensitive to the environment and exhibits an enhanced splitting in magnetic field. As the temperature is increased, the excitons are thermally excited out of the defect states and the dominant transition is that of the negatively charged exciton. Furthermore, upon excitation with a circularly polarized light, the PL retains a degree of polarization reaching 50% and inherited from the valley polarized photoexcited excitons. The studies of PL dynamics reveal that the PL lifetime is on the order of 10 ps, which is probably limited by non-radiative processes. Our results underline the potential of liquid exfoliated TMD monolayers in large scale optoelectronic devices.

Cuvinte-cheie
liquid phase exfoliation, valley polarization, photoluminescence, transition metal dichalcogenides

Crossref XML Export

<?xml version='1.0' encoding='utf-8'?>
<doi_batch version='4.3.7' xmlns='http://www.crossref.org/schema/4.3.7' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.crossref.org/schema/4.3.7 http://www.crossref.org/schema/deposit/crossref4.3.7.xsd'>
<head>
<doi_batch_id>ibn-56190</doi_batch_id>
<timestamp>1714003006</timestamp>
<depositor>
<depositor_name>Information Society Development Instiute, Republic of Moldova</depositor_name>
<email_address>idsi@asm.md</email_address>
</depositor>
</head>
<body>
<journal>
<journal_metadata>
<full_title>Nanotechnology</full_title>
<issn media_type='print'>09574484</issn>
</journal_metadata>
<journal_issue>
<publication_date media_type='print'>
<year>2016</year>
</publication_date>
<issue></issue>
</journal_issue>
<journal_article publication_type='full_text'><titles>
<title>Revealing the nature of excitons in liquid exfoliated monolayer tungsten disulphide</title>
</titles>
<contributors>
<person_name sequence='first' contributor_role='author'>
<given_name>Lukasz</given_name>
<surname>Kłopotowski</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Claudia</given_name>
<surname>Backes</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Anatolie</given_name>
<surname>Mitioglu</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Victor</given_name>
<surname>Vega-Mayoral</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Damien</given_name>
<surname>Hanlon</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Jonathan N.</given_name>
<surname>Coleman</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Vitalii</given_name>
<surname>Ivanov</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Duncan Kennedy</given_name>
<surname>Maude</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Paulina</given_name>
<surname>Plochocka</surname>
</person_name>
</contributors>
<publication_date media_type='print'>
<year>2016</year>
</publication_date>
<pages>
<first_page>510</first_page>
<last_page>518</last_page>
</pages>
<doi_data>
<doi>10.1088/0957-4484/27/42/425701</doi>
<resource>http://www.crossref.org/</resource>
</doi_data>
</journal_article>
</journal>
</body>
</doi_batch>