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dc.contributor.authorDang, Hoang X.
dc.contributor.authorWang, Kai
dc.contributor.authorGhasemi, Masoud
dc.contributor.authorTang, Ming-Chun
dc.contributor.authorde Bastiani, Michele
dc.contributor.authorAydin, Erkan
dc.contributor.authorDauzon, Emilie
dc.contributor.authorBarrit, Dounya
dc.contributor.authorPeng, Jun
dc.contributor.authorSmilgies, Detlef M.
dc.contributor.authorDe Wolf, Stefaan
dc.contributor.authorAmassian, Aram
dc.date.accessioned2019-08-01T08:57:06Z
dc.date.available2019-08-01T08:57:06Z
dc.date.issued2019-06-06
dc.identifier.citationDang, H. X., Wang, K., Ghasemi, M., Tang, M.-C., De Bastiani, M., Aydin, E., … Amassian, A. (2019). Multi-cation Synergy Suppresses Phase Segregation in Mixed-Halide Perovskites. Joule, 3(7), 1746–1764. doi:10.1016/j.joule.2019.05.016
dc.identifier.doi10.1016/j.joule.2019.05.016
dc.identifier.urihttp://hdl.handle.net/10754/656292
dc.description.abstractMixed lead halide perovskite solar cells have been demonstrated to benefit tremendously from the addition of Cs+ and Rb+, but its root cause is yet to be understood. This hinders further improvement, and processing approaches remain largely empirical. We address the challenge by tracking the solidification of precursors in situ and linking the evolutions of different crystalline phases to the presence of Cs+ and Rb+. In their absence, the perovskite film is inherently unstable, segregating into MA-I- and FA-Br-rich phases. Adding either Cs+ or Rb+ is shown to alter the solidification process of the perovskite films. The optimal addition of both Cs+ and Rb+ drastically suppress phase segregation and promotes the spontaneous formation of the desired α phase. We propose that the synergistic effect is due to the collective benefits of Cs+ and Rb+ on the formation kinetics of the α phase and on the halide distribution throughout the film.
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award no. OSR-CARF URF/1/3079-33-01. CHESS is supported by the NSF and NIH/NIGMS via NSF award DMR-1332208. H.X.D thanks Dr. Ching-Chang Chung for helping with the temperature-dependent XRD measurements. This work was performed in part at the Analytical Instrumentation Facility (AIF) at North Carolina State University, which is supported by the State of North Carolina and the NSF award no. ECCS-1542015. H.X.D. A.A. and S.D.W. designed all the experiments. H.X.D. fabricated and performed the characterization of thin films and solar cells. H.X.D. M.-C.T. E.D. D.B. D.-M.S. and A.A. contributed to the GIWAXS experiments and data analysis. A.A. guided GIWAXS and XRD measurements and analysis and assisted with phase identification. K.W. synthesized Cl-TiO2 and measured the stabilized PCE. K.W. and E.A. assisted with the device optimization. J.P. helped in defining the additive contents. M.G. contributed to the ToF-SIMS measurements. H.X.D. drafted the manuscript. M.D.B. A.A. and S.D.W. assisted in revising the manuscript. A.A. and S.D.W. supervised the project. The authors declare no competing interests.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S2542435119302594
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Joule. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Joule, [[Volume], [Issue], (2019-07-17)] DOI: 10.1016/j.joule.2019.05.016 . © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjecthybrid perovskites
dc.subjectsolar cells
dc.subjectin situ characterization
dc.subjectphase transformation
dc.subjectphase segregation
dc.titleMulti-cation Synergy Suppresses Phase Segregation in Mixed-Halide Perovskites
dc.typeArticle
dc.contributor.departmentKAUST Solar Center
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentOffice of the VP
dc.contributor.departmentOrganic Electronics and Photovoltaics Group
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJoule
dc.rights.embargodate2020-07-17
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA
dc.contributor.institutionResearch School of Engineering, Australian National University, Canberra, ACT 2601, Australia
dc.contributor.institutionCornell High Energy Synchrotron Source (CHESS), Cornell University, Ithaca, NY 14850, USA
kaust.personDang, Hoang X.
kaust.personWang, Kai
kaust.personTang, Ming-Chun
kaust.personde Bastiani, Michele
kaust.personAydin, Erkan
kaust.personDauzon, Emilie
kaust.personBarrit, Dounya
kaust.personPeng, Jun
kaust.personDe Wolf, Stefaan
kaust.personAmassian, Aram
kaust.grant.numberOSR-CARF URF/1/3079-33-01
refterms.dateFOA2020-07-17T00:00:00Z
kaust.acknowledged.supportUnitOffice of Sponsored Research
dc.date.published-online2019-06-06
dc.date.published-print2019-07


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NOTICE: this is the author’s version of a work that was accepted for publication in Joule. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Joule, [[Volume], [Issue], (2019-07-17)] DOI: 10.1016/j.joule.2019.05.016 . © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Except where otherwise noted, this item's license is described as NOTICE: this is the author’s version of a work that was accepted for publication in Joule. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Joule, [[Volume], [Issue], (2019-07-17)] DOI: 10.1016/j.joule.2019.05.016 . © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/