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Here, we systematically investigate the influence of Rb+ and Cs+ on the carrier dynamics using transient optical spectroscopy and correlate with solar cell performance. Unlike Rb+, Cs+ integrates well with methylammonium (MA+) and formamidinium (FA+) yielding increased perovskite grain size, longer charge carrier lifetimes and improved power conversion efficiency (PCE). Concomitant incorporation of Cs+/Rb+ cooperatively retards radiative recombination by ~60% in the quaternary-cation based perovskite system (RbCsMAFA) compared to the dual-cation MAFA samples. By suppressing the defect density, PCEs around 20% are obtained along with more balanced charge carrier diffusion length and comparable photoluminescence quantum yield in quaternary-cation perovskites. While the synergistic addition of Rb+ and Cs+ is attractive for controlling defects and recombination losses in efficient solar cells development, sole incorporation of Rb+ is still an engineering challenge. Importantly, our study explicates the underlying mechanisms behind the synergistic combination of cations to minimize the charge carrier losses and achieve high efficiency perovskite solar cells.","citation:dsDescriptionDate":"2019-04-01"},"citation:keyword":{"citation:keywordValue":"Perovskite solar cell, Charge carrier dynamics, Rubidium, Cesium and Recombination"},"publication":[{"publicationCitation":"Solanki, A., Yadav, P., Turren-Cruz, S.-H., Lim, S. S., Saliba, M., & Sum, T. C. (2019). Cation influence on carrier dynamics in perovskite solar cells. Nano Energy, 58, 604-611.","publicationIDType":"doi","publicationIDNumber":"10.1016/j.nanoen.2019.01.060","publicationURL":"https://www.sciencedirect.com/science/article/pii/S2211285519300801"},{"publicationCitation":"Solanki, A., Yadav, P., Turren-Cruz, S.-H., Lim, S. S., Saliba, M., & Sum, T. C. (2019). Cation influence on carrier dynamics in perovskite solar cells. Nano Energy, 58, 604-611.","publicationIDType":"handle","publicationIDNumber":"10356/137821","publicationURL":"https://hdl.handle.net/10356/137821"}],"software":[{"citation:softwareName":"Txt"},{"citation:softwareName":"Origin"}],"author":[{"citation:authorName":"Ankur Solanki","citation:authorAffiliation":"Nanyang Technological University","authorIdentifierScheme":"ORCID","authorIdentifier":"0000-0002-8305-8536"},{"citation:authorName":"Pankaj Yadav","citation:authorAffiliation":"Pandit Deendayal Petroleum University, Gandhinagar 380007, India"},{"citation:authorName":"Silver-Hamill Turren-Cruz","citation:authorAffiliation":"Adolphe Merkle Institute, Chemins des Verdiers 4, CH-1700 Fribourg, Switzerland"},{"citation:authorName":"Swee Sien Lim","citation:authorAffiliation":"Nanyang Technological University","authorIdentifierScheme":"ORCID","authorIdentifier":"0000-0003-4930-3718"},{"citation:authorName":"Michael Saliba","citation:authorAffiliation":"Adolphe Merkle Institute, Chemins des Verdiers 4, CH-1700 Fribourg, Switzerland"},{"citation:authorName":"Sum, Tze Chien","citation:authorAffiliation":"Nanyang Technological University","authorIdentifierScheme":"ORCID","authorIdentifier":"0000-0003-4049-2719"}],"grantNumber":[{"citation:grantNumberAgency":"Nanyang Technological University","citation:grantNumberValue":"start-up grant M4080514"},{"citation:grantNumberAgency":"Nanyang Technological University","citation:grantNumberValue":"JSPS-NTU Joint Research Project M4082176"},{"citation:grantNumberAgency":"Ministry of Education (MOE)","citation:grantNumberValue":"AcRF Tier 1 grant RG173/16"},{"citation:grantNumberAgency":"Ministry of Education (MOE)","citation:grantNumberValue":"Tier 2 grants MOE2015-T2-2-015"},{"citation:grantNumberAgency":"Ministry of Education (MOE)","citation:grantNumberValue":"MOE2016-T2-1-034"},{"citation:grantNumberAgency":"National Research Foundation (NRF)","citation:grantNumberValue":"Competitive Research Programme NRF-CRP14–2014-03"},{"citation:grantNumberAgency":"National Research Foundation (NRF)","citation:grantNumberValue":"NRF Investigatorship Programme NRF-NRFI-2018-04"}],"@id":"doi:10.21979/N9/KAG1U8","@type":["ore:Aggregation","schema:Dataset"],"schema:version":"1.3","schema:name":"Replication Data for: Cation influence on carrier dynamics in perovskite solar cells","schema:dateModified":"Tue Sep 20 09:48:57 SGT 2022","schema:datePublished":"2019-05-31","schema:license":"http://creativecommons.org/licenses/by-nc/4.0","dvcore:fileTermsOfAccess":{"dvcore:fileRequestAccess":false},"schema:includedInDataCatalog":"DR-NTU (Data)","ore:aggregates":[{"schema:description":"Light J-V characteristics of solar cell devices fabricated with perovskite\r\nflms consisting different cations.","schema:name":"Figure 1.7z","dvcore:restricted":false,"schema:version":1,"dvcore:datasetVersionId":1010,"@id":"https://researchdata.ntu.edu.sg/file.xhtml?fileId=10256","schema:sameAs":"https://researchdata.ntu.edu.sg/api/access/datafile/10256","@type":"ore:AggregatedResource","schema:fileFormat":"application/x-7z-compressed","dvcore:filesize":15460,"dvcore:storageIdentifier":"file://16b0c46ae34-4f72c00d900a","dvcore:rootDataFileId":-1,"dvcore:checksum":{"@type":"MD5","@value":"705a924d6bcfef5bd78c1b53503e9c72"}},{"schema:description":"(a) Photoexcited carrier density as a function of integrated PL intensity of different perovskite films measured in the low fluence regime: solid lines are the corresponding fts of the experimental data with the trap density model, (b) mono-exponential fitting of low fluence PL kinetics.","schema:name":"Figure 2.7z","dvcore:restricted":false,"schema:version":1,"dvcore:datasetVersionId":1010,"@id":"https://researchdata.ntu.edu.sg/file.xhtml?fileId=10257","schema:sameAs":"https://researchdata.ntu.edu.sg/api/access/datafile/10257","@type":"ore:AggregatedResource","schema:fileFormat":"application/x-7z-compressed","dvcore:filesize":1392886,"dvcore:storageIdentifier":"file://16b0c46afb2-5fd6ff3247c1","dvcore:rootDataFileId":-1,"dvcore:checksum":{"@type":"MD5","@value":"83096f978e99a27fa618c450d7787eab"}},{"schema:description":"Recombination rates and diffusion lengths","schema:name":"Figure 3.7z","dvcore:restricted":false,"schema:version":1,"dvcore:datasetVersionId":1010,"@id":"https://researchdata.ntu.edu.sg/file.xhtml?fileId=10258","schema:sameAs":"https://researchdata.ntu.edu.sg/api/access/datafile/10258","@type":"ore:AggregatedResource","schema:fileFormat":"application/x-7z-compressed","dvcore:filesize":1559024,"dvcore:storageIdentifier":"file://16b0c46b152-705cf36845b1","dvcore:rootDataFileId":-1,"dvcore:checksum":{"@type":"MD5","@value":"03715484a83110b52ff991c4c4a1f066"}},{"schema:description":"A plot of the variation of photoluminescence quantum yield (PLQY), VOC and fll\r\nfactor in relation to different cation-based perovskite flms. 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