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dc.contributor.authorLim, Swee Sienen_US
dc.contributor.authorGiovanni, Daviden_US
dc.contributor.authorZhang, Qiannanen_US
dc.contributor.authorSolanki, Ankuren_US
dc.contributor.authorNur Fadilah Jamaludinen_US
dc.contributor.authorLim, Melvin Jia Weien_US
dc.contributor.authorMathews, Nripanen_US
dc.contributor.authorMhaisalkar, Subodhen_US
dc.contributor.authorPshenichnikov, Maxim S.en_US
dc.contributor.authorSum, Tze Chienen_US
dc.identifier.citationLim, S. S., Giovanni, D., Zhang, Q., Solanki, A., Nur Fadilah Jamaludin, Lim, M. J. W., ... Sum, T. C. (2019). Hot carrier extraction in CH3NH3PbI3 unveiled by pump-push-probe spectroscopy. Science Advances, 5(11), eaax3620-. doi:10.1126/sciadv.aax3620en_US
dc.description.abstractHalide perovskites are promising materials for development in hot carrier (HC) solar cells, where the excess energy of above-bandgap photons is harvested before being wasted as heat to enhance device efficiency. Presently, HC separation and transfer processes at higher-energy states remain poorly understood. Here, we investigate the excited state dynamics in CH3NH3PbI3 using pump-push-probe spectroscopy. It has its intrinsic advantages for studying these dynamics over conventional transient spectroscopy, albeit complementary to one another. By exploiting the broad excited-state absorption characteristics, our findings reveal the transfer of HCs from these higher-energy states into bathophenanthroline (bphen), an energy selective organic acceptor far above perovskite's band edges. Complete HC extraction is realized only after overcoming the interfacial barrier formed at the heterojunction, estimated to be between 1.01 and 1.08 eV above bphen's lowest unoccupied molecular orbital level. The insights gained here are essential for the development of a new class of optoelectronics.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofScience Advancesen_US
dc.rights© 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S.Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).en_US
dc.titleHot carrier extraction in CH3NH3PbI3 unveiled by pump-push-probe spectroscopyen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.schoolInterdisciplinary Graduate School (IGS)en_US
dc.contributor.researchEnergy Research Institute @ NTU (ERI@N)en_US
dc.description.versionPublished versionen_US
dc.subject.keywordsHot Carrieren_US
dc.description.acknowledgementFinancial support from the Nanyang Technological University start-up grant M4080514, the JSPS-NTU Joint Research Project M4082176, the Ministry of Education AcRF Tier 1 grant RG173/16 and Tier 2 grants MOE2015-T2-2-015, MOE2016-T2-1-034, and MOE2017-T2-2-002, the U.S. Office of Naval Research (ONRGNICOPN62909-17-1-2155), and the Singapore National Research Foundation (Programs NRF-CRP14-2014-03, NRF2018-ITC001-001, and NRF-NRFI-2018-04) is acknowledged.en_US
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