Positive and Negative Photoconductivity in Monolayer MoS₂ as a Function of Physisorbed Oxygen

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dc.contributor.authorGustafson, Jon
dc.contributor.authorWines, Daniel
dc.contributor.authorGulian, Ellen
dc.contributor.authorAtaca, Can
dc.contributor.authorHayden, Michael
dc.date.accessioned2022-09-19T17:16:32Z
dc.date.available2022-09-19T17:16:32Z
dc.date.issued2021-04-16
dc.description.abstractWe investigate the effect of molecular oxygen on the photoconductivity of monolayer MoS₂ via broad-band time-resolved terahertz spectroscopy. We observe that the photoconductivity of monolayer MoS₂ transitions from negative to positive when the environment of MoS₂ changes from vacuum to atmospheric pressure. We argue that this transition from negative to positive photoconductivity results from physically adsorbed oxygen depleting excess electrons from the n-type MoS₂. We attribute the negative photoconductivity to negative trion formation, in which photoinduced excitons capture excess electrons from the MoS₂. We attribute the positive photoconductivity to negative trion formation as well; however, in this case, photoinduced excitons capture photoinduced defect electrons rather than excess electrons, which have been immobilized by physisorbed oxygen. These results should prove useful to those who look to make sensors and other types of devices out of monolayer MoS₂ as physisorbed gases, particularly oxygen, can dramatically affect the conductivity of the monolayer.en_US
dc.description.sponsorshipJ.K.G. and L.M.H. acknowledge support from a UMBC START grant. J.K.G. also acknowledges the support of the Department of Education through a GAANN Fellowship under award number P200A150003-17. E.G. acknowledges support from a UMBC URA Scholarship. D.W. and C.A. acknowledge support by the National Science Foundation through the Division of Materials Research under NSF DMR-1726213 Grant.en_US
dc.description.urihttps://pubs.acs.org/doi/10.1021/acs.jpcc.1c01550en_US
dc.format.extent20 pagesen_US
dc.genrejournal articlesen_US
dc.genrepreprintsen_US
dc.identifierdoi:10.13016/m2l1k3-mjfq
dc.identifier.citationGustafson, Jon K. et al. Positive and Negative Photoconductivity in Monolayer MoS2 as a Function of Physisorbed Oxygen. The Journal of Physical Chemistry C 2021 125 (16), 8712-8718 DOI: 10.1021/acs.jpcc.1c01550en_US
dc.identifier.urihttps://doi.org/10.1021/acs.jpcc.1c01550
dc.identifier.urihttp://hdl.handle.net/11603/25734
dc.language.isoen_USen_US
dc.publisherACSen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Student Collection
dc.relation.ispartofUMBC Mathematics and Statistics Department
dc.rightsThis document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in The Journal of Physical Chemistry C , copyright © American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.1c01550en_US
dc.titlePositive and Negative Photoconductivity in Monolayer MoS₂ as a Function of Physisorbed Oxygenen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0003-1745-3121en_US
dcterms.creatorhttps://orcid.org/0000-0003-3855-3754
dcterms.creatorhttps://orcid.org/0000-0003-4959-1334
dcterms.creatorhttps://orcid.org/0000-0002-1756-1328

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