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Measuring Photoexcited Free Charge Carriers in Mono- To Few-Layer Transition-Metal Dichalcogenides with Steady-State Microwave Conductivity

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dc.contributor.authorJeffrey L. Blackburn-
dc.contributor.authorHanyu Zhang-
dc.contributor.authorAlexis R. Myers-
dc.contributor.authorJeremy R. Dunklin-
dc.contributor.authorDavid C. Coffey-
dc.contributor.authorRebecca N. Hirsch-
dc.contributor.authorDerek Vigil-Fowler-
dc.contributor.authorSeok Joon Yun-
dc.contributor.authorByeong Wook Cho-
dc.contributor.authorYoung Hee Lee-
dc.contributor.authorElisa M. Miller-
dc.contributor.authorGarry Rumbles-
dc.contributor.authorObadiah G. Reid-
dc.date.available2020-03-18T08:17:38Z-
dc.date.created2020-01-07-
dc.date.issued2020-01-
dc.identifier.issn1948-7185-
dc.identifier.urihttps://pr.ibs.re.kr/handle/8788114/7018-
dc.description.abstract© 2019 American Chemical Society.Photoinduced generation of mobile charge carriers is the fundamental process underlying many applications, such as solar energy harvesting, solar fuel production, and efficient photodetectors. Monolayer transition-metal dichalcogenides (TMDCs) are an attractive model system for studying photoinduced carrier generation mechanisms in low-dimensional materials because they possess strong direct band gap absorption, large exciton binding energies, and are only a few atoms thick. While a number of studies have observed charge generation in neat TMDCs for photoexcitation at, above, or even below the optical band gap, the role of nonlinear processes (resulting from high photon fluences), defect states, excess charges, and layer interactions remains unclear. In this study, we introduce steady-state microwave conductivity (SSMC) spectroscopy for measuring charge generation action spectra in a model WS2 mono- to few-layer TMDC system at fluences that coincide with the terrestrial solar flux. Despite utilizing photon fluences well below those used in previous pump-probe measurements, the SSMC technique is sensitive enough to easily resolve the photoconductivity spectrum arising in mono- to few-layer WS2. By correlating SSMC with other spectroscopy and microscopy experiments, we find that photoconductivity is observed predominantly for excitation wavelengths resonant with the excitonic transition of the multilayer portions of the sample, the density of which can be controlled by the synthesis conditions. These results highlight the potential of layer engineering as a route toward achieving high yields of photoinduced charge carriers in neat TMDCs, with implications for a broad range of optoelectronic applications-
dc.description.uri1-
dc.language영어-
dc.publisherAMER CHEMICAL SOC-
dc.titleMeasuring Photoexcited Free Charge Carriers in Mono- To Few-Layer Transition-Metal Dichalcogenides with Steady-State Microwave Conductivity-
dc.typeArticle-
dc.type.rimsART-
dc.identifier.wosid000506088000016-
dc.identifier.scopusid2-s2.0-85077117553-
dc.identifier.rimsid71011-
dc.contributor.affiliatedAuthorSeok Joon Yun-
dc.contributor.affiliatedAuthorByeong Wook Cho-
dc.contributor.affiliatedAuthorYoung Hee Lee-
dc.identifier.doi10.1021/acs.jpclett.9b03117-
dc.identifier.bibliographicCitationJOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.11, no.1, pp.99 - 107-
dc.citation.titleJOURNAL OF PHYSICAL CHEMISTRY LETTERS-
dc.citation.volume11-
dc.citation.number1-
dc.citation.startPage99-
dc.citation.endPage107-
dc.description.journalClass1-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.subject.keywordPlusWALLED CARBON NANOTUBES-
dc.subject.keywordPlusBANDGAP RENORMALIZATION-
dc.subject.keywordPlusEXCITON DISSOCIATION-
dc.subject.keywordPlusMOS2-
dc.subject.keywordPlusMONOLAYER-
dc.subject.keywordPlusWS2-
dc.subject.keywordPlusSEPARATION-
dc.subject.keywordPlusPHOTOLUMINESCENCE-
dc.subject.keywordPlusEVOLUTION-
dc.subject.keywordPlusDYNAMICS-
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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