Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/83895
Title: Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals
Authors: Li, Mingjie
Bhaumik, Saikat
Goh, Teck Wee
Kumar, Muduli Subas
Yantara, Natalia
Grätzel, Michael
Mhaisalkar, Subodh
Mathews, Nripan
Sum, Tze Chien
Keywords: Organic–inorganic Nanostructures
Solar Cells
Issue Date: 2017
Source: Li, M., Bhaumik, S., Goh, T. W., Kumar, M. S., Yantara, N., Grätzel, M., et al. (2017). Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals. Nature Communications, 8, 14350-.
Series/Report no.: Nature Communications
Abstract: Hot-carrier solar cells can overcome the Shockley-Queisser limit by harvesting excess energy from hot carriers. Inorganic semiconductor nanocrystals are considered prime candidates. However, hot-carrier harvesting is compromised by competitive relaxation pathways (for example, intraband Auger process and defects) that overwhelm their phonon bottlenecks. 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 to ∼83%) 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.
URI: https://hdl.handle.net/10356/83895
http://hdl.handle.net/10220/42852
ISSN: 2041-1723
DOI: 10.1038/ncomms14350
Rights: © 2017 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
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