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dc.contributor.authorNugraha, Mohamad Insan
dc.contributor.authorSun, Bin
dc.contributor.authorKim, Hyunho
dc.contributor.authorEl Labban, Abdulrahman
dc.contributor.authorDesai, Saheena
dc.contributor.authorChaturvedi, Neha
dc.contributor.authorHou, Yi
dc.contributor.authorGarcía de Arquer, F Pelayo
dc.contributor.authorAlshareef, Husam N.
dc.contributor.authorSargent, E.
dc.contributor.authorBaran, Derya
dc.date.accessioned2021-04-19T06:52:47Z
dc.date.available2021-04-19T06:52:47Z
dc.date.issued2021-04-15
dc.date.submitted2021-01-28
dc.identifier.citationNugraha, M. I., Sun, B., Kim, H., El-Labban, A., Desai, S., Chaturvedi, N., … Baran, D. (2021). Dopant-Assisted Matrix Stabilization Enables Thermoelectric Performance Enhancement in n-Type Quantum Dot Films. ACS Applied Materials & Interfaces. doi:10.1021/acsami.1c01886
dc.identifier.issn1944-8244
dc.identifier.pmid33856780
dc.identifier.doi10.1021/acsami.1c01886
dc.identifier.urihttp://hdl.handle.net/10754/668824
dc.description.abstractEfficient thermoelectric generators require further progress in developing n-type semiconductors that combine low thermal conductivity with high electrical conductivity. By embedding colloidal quantum dots (CQDs) in a metal halide matrix (QDMH), the metal halide matrix can enhance phonon scattering, thus suppressing thermal transport; however, simultaneously achieving high electrical conductivity in such systems has previously been limited by the deleterious impact of a large density of interfaces on charge transport. Therefore, new strategies are needed to improve charge carrier transport without sacrificing matrix-enabled low thermal transport. Here, we report the use of chemical doping in the solution state to improve electron transport while maintaining low thermal transport in QDMH films. By incorporating cesium carbonate (Cs2CO3) salts as a dopant prior to matrix formation, we find that the dopant stabilizes the matrix in colloidal inks and enables efficient n-type doping in QDMH films. As a result, this strategy leads to an enhanced n-type thermoelectric behavior in solution-processed QDMH films near room temperature, with a thermal conductivity of 0.25 W m–1 K–1—significantly lower than in prior films based on organic-ligand-cross-linked CQD films (>0.6 W m–1 K–1) and spark-plasma-sintered CQD systems (>1 W m–1 K–1). This study provides a pathway to developing efficient n-type thermoelectric materials with low thermal conductivity using single-step deposition and low-temperature processing.
dc.description.sponsorshipThe authors would like to acknowledge Nimer Wehbe at KAUST Core Labs for supporting XPS measurements in this work. Research in this publication was supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award no. OSRCRG2018-3737.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acsami.1c01886
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied materials & interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsami.1c01886.
dc.titleDopant-Assisted Matrix Stabilization Enables Thermoelectric Performance Enhancement in n-Type Quantum Dot Films.
dc.typeArticle
dc.contributor.departmentPhysical Science and Engineering Division (PSE), KAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentKAUST Solar Center (KSC)
dc.identifier.journalACS applied materials & interfaces
dc.rights.embargodate2022-04-15
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada
kaust.personNugraha, Mohamad Insan
kaust.personKim, Hyunho
kaust.personEl Labban, Abdulrahman
kaust.personDesai, Saheena
kaust.personChaturvedi, Neha
kaust.personAlshareef, Husam N.
kaust.personBaran, Derya
kaust.grant.numberCRG2018-3737.
dc.date.accepted2021-04-05
kaust.acknowledged.supportUnitCore Labs
kaust.acknowledged.supportUnitCRG
kaust.acknowledged.supportUnitKAUST Core Lab
kaust.acknowledged.supportUnitOffice of Sponsored Research (OSR)
dc.date.published-online2021-04-15
dc.date.published-print2021-04-28


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