Please use this identifier to cite or link to this item: https://doi.org/10.1063/5.0022775
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dc.titleObservation of interacting polaronic gas behavior in Ta-doped TiO2 thin films via terahertz time-domain spectroscopy
dc.contributor.authorLiang Cheng
dc.contributor.authorTarapada Sarkar
dc.contributor.authorJames Lourembam
dc.contributor.authorRoxanne Tutchton
dc.contributor.authorM. Motapathula
dc.contributor.authorDaming Zhao
dc.contributor.authorJian-Xin Zhu
dc.contributor.authorThirumalai Venkatesan
dc.contributor.authorElbert E. M. Chia
dc.date.accessioned2021-04-09T07:01:20Z
dc.date.available2021-04-09T07:01:20Z
dc.date.issued2020-12-29
dc.identifier.citationLiang Cheng, Tarapada Sarkar, James Lourembam, Roxanne Tutchton, M. Motapathula, Daming Zhao, Jian-Xin Zhu, Thirumalai Venkatesan, Elbert E. M. Chia (2020-12-29). Observation of interacting polaronic gas behavior in Ta-doped TiO2 thin films via terahertz time-domain spectroscopy. Applied Physics Letters 117 (26). ScholarBank@NUS Repository. https://doi.org/10.1063/5.0022775
dc.identifier.issn10773118
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/189004
dc.description.abstractTransparent conductive oxides (TCOs)—materials that have the twin desirable features of high optical transmission and electrical conductivity—play an increasingly significant role in the fields of photovoltaics and information technology. As an excellent TCO, Ta-doped anatase TiO2 shows great promise for a wide range of applications. Here, terahertz time-domain spectroscopy is used to study the complex optical conductivity r x ~ð Þ of the TCO—heavily Ta-doped TiO2 thin films with different Ta-doping concentrations, in the frequency range of 0.3–2.7 THz and the temperature range of 10–300 K. Fitting the complex optical conductivity to a Drude-like behavior allows us to extract the temperature dependence of the effective mass, which suggests the existence of many-body large polarons. Moreover, the carrier scattering rate of Ta-doped TiO2 with different carrier concentrations agrees with the interacting polaron gas theory. Our results suggest that with increasing electron density in TiO2, the interaction between polarons is larger and electron–phonon coupling is smaller, which is beneficial for achieving high mobility and conductivity in TiO2.
dc.publisherAIP Publishing
dc.subjectScattering
dc.subjectDoping
dc.subjectThin films
dc.subjectPhonons
dc.subjectElectrical conductivity
dc.subjectPolarons
dc.subjectTerahertz time-domain spectroscopy
dc.typeArticle
dc.contributor.departmentDEPT OF ELECTRICAL & COMPUTER ENGG
dc.contributor.departmentDEPT OF PHYSICS
dc.contributor.departmentNUS NANOSCIENCE & NANOTECH INITIATIVE
dc.description.doi10.1063/5.0022775
dc.description.sourcetitleApplied Physics Letters
dc.description.volume117
dc.description.issue26
dc.published.stateUnpublished
dc.grant.idNRF-CRP15-2015-01
dc.grant.fundingagencyNational Research Foundation
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