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dc.contributor.authorXu, Jixian
dc.contributor.authorVoznyy, Oleksandr
dc.contributor.authorLiu, Mengxia
dc.contributor.authorKirmani, Ahmad R.
dc.contributor.authorWalters, Grant
dc.contributor.authorMunir, Rahim
dc.contributor.authorAbdelsamie, Maged
dc.contributor.authorProppe, Andrew H.
dc.contributor.authorSarkar, Amrita
dc.contributor.authorGarcía de Arquer, F. Pelayo
dc.contributor.authorWei, Mingyang
dc.contributor.authorSun, Bin
dc.contributor.authorLiu, Min
dc.contributor.authorOuellette, Olivier
dc.contributor.authorQuintero-Bermudez, Rafael
dc.contributor.authorLi, Jie
dc.contributor.authorFan, James
dc.contributor.authorQuan, Li Na
dc.contributor.authorTodorovic, Petar
dc.contributor.authorTan, Hairen
dc.contributor.authorHoogland, Sjoerd
dc.contributor.authorKelley, Shana O.
dc.contributor.authorStefik, Morgan
dc.contributor.authorAmassian, Aram
dc.contributor.authorSargent, Edward H.
dc.date.accessioned2018-04-26T12:41:32Z
dc.date.available2018-04-26T12:41:32Z
dc.date.issued2018-04-20
dc.identifier.citationXu J, Voznyy O, Liu M, Kirmani AR, Walters G, et al. (2018) 2D matrix engineering for homogeneous quantum dot coupling in photovoltaic solids. Nature Nanotechnology. Available: http://dx.doi.org/10.1038/s41565-018-0117-z.
dc.identifier.issn1748-3387
dc.identifier.issn1748-3395
dc.identifier.pmid29686291
dc.identifier.doi10.1038/s41565-018-0117-z
dc.identifier.urihttp://hdl.handle.net/10754/627674
dc.description.abstractColloidal quantum dots (CQDs) are promising photovoltaic (PV) materials because of their widely tunable absorption spectrum controlled by nanocrystal size1,2. Their bandgap tunability allows not only the optimization of single-junction cells, but also the fabrication of multijunction cells that complement perovskites and silicon 3 . Advances in surface passivation2,4-7, combined with advances in device structures 8 , have contributed to certified power conversion efficiencies (PCEs) that rose to 11% in 2016 9 . Further gains in performance are available if the thickness of the devices can be increased to maximize the light harvesting at a high fill factor (FF). However, at present the active layer thickness is limited to ~300 nm by the concomitant photocarrier diffusion length. To date, CQD devices thicker than this typically exhibit decreases in short-circuit current (JSC) and open-circuit voltage (VOC), as seen in previous reports3,9-11. Here, we report a matrix engineering strategy for CQD solids that significantly enhances the photocarrier diffusion length. We find that a hybrid inorganic-amine coordinating complex enables us to generate a high-quality two-dimensionally (2D) confined inorganic matrix that programmes internanoparticle spacing at the atomic scale. This strategy enables the reduction of structural and energetic disorder in the solid and concurrent improvements in the CQD packing density and uniformity. Consequently, planar devices with a nearly doubled active layer thicknesses (~600 nm) and record values of JSC (32 mA cm-2) are fabricated. The VOC improved as the current was increased. We demonstrate CQD solar cells with a certified record efficiency of 12%.
dc.description.sponsorshipThis publication is based in part on work supported by the Natural Sciences and Engineering Research Council of Canada, by the Ontario Research Fund Research Excellence Program and by Award OSR-2017-CPF-3321-03 made by King Abdullah University of Science and Technology (KAUST). Some of the GIWAXS/GISAXS measurements were performed at the Cornell High Energy Synchrotron Source (CHESS), supported by the NSF Award DMR-1332208. This work also made use of the South Carolina SAXS Collaborative using a SAXSLab Ganesha for the GISAXS/GIWAXS measurements, supported by the NSF Major Research Instrumentation program (award no. DMR-1428620). We thank U. Jeng for the GIWAXS tested at the National Synchrotron Radiation Research Center, Taiwan, China. We thank L. Goncharova for assistance with RBS measurements. We thank D. Kopilovic, E. Palmiano, L. Levina and R. Wolowiec for the technical support.
dc.publisherSpringer Nature
dc.relation.urlhttps://www.nature.com/articles/s41565-018-0117-z
dc.rightsThe final publication is available at Springer via http://dx.doi.org/10.1038/s41565-018-0117-z
dc.title2D matrix engineering for homogeneous quantum dot coupling in photovoltaic solids
dc.typeArticle
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentMaterials Science and Engineering Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.identifier.journalNature Nanotechnology
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada.
dc.contributor.institutionDepartment of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, USA.
dc.contributor.institutionDepartment of Chemistry, University of Toronto, Toronto, Ontario, Canada.
kaust.personKirmani, Ahmad R.
kaust.personMunir, Rahim
kaust.personAbdelsamie, Maged
kaust.personAmassian, Aram
kaust.grant.numberOSR-2017-CPF-3321-03


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