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Here we show colloidal halide perovskite nanocrystals transcend these limitations and exhibit around two orders slower hot-carrier cooling times and around four times larger hot-carrier temperatures than their bulk-film counterparts. Under low pump excitation, hot-carrier cooling mediated by a phonon bottleneck is surprisingly slower in smaller nanocrystals (contrasting with conventional nanocrystals). At high pump fluence, Auger heating dominates hot-carrier cooling, which is slower in larger nanocrystals (hitherto unobserved in conventional nanocrystals). Importantly, we demonstrate efficient room temperature hot-electrons extraction (up toB83%) by an energy-selective electron acceptor layer within 1 ps from surface-treated perovskite NCs thin films. These insights enable fresh approaches for extremely thin absorber and concentrator-type hot-carrier solar cells."},"software":{"citation:softwareName":"Origin"},"citation:datasetContact":{"citation:datasetContactName":"Sum Tze Chien","citation:datasetContactAffiliation":"Nanyang Technological University"},"publication":{"publicationCitation":"Li, Mingjie, Saikat Bhaumik, Teck Wee Goh, Muduli Subas Kumar, Natalia Yantara, Michael Grätzel, Subodh Mhaisalkar, Nripan Mathews, and Tze Chien Sum. \"Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals.\" Nature communications 8 (2017): 14350.","publicationURL":"https://www.nature.com/articles/ncomms14350"},"citation:keyword":[{"citation:keywordValue":"Perovskite"},{"citation:keywordValue":"solar cell"},{"citation:keywordValue":"carrier dynamics"}],"author":[{"citation:authorName":"Li, Mingjie","citation:authorAffiliation":"Nanyang Technological University"},{"citation:authorName":"Saikat 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