Please use this identifier to cite or link to this item:
|Title:||Low threshold and efficient multiple exciton generation in halide perovskite nanocrystals||Authors:||Li, Mingjie
Koh, Teck Ming
Veldhuis, Sjoerd A.
Sum, Tze Chien
Multiple Exciton Generation
|Issue Date:||2018||Source:||Li, M., Begum, R., Fu, J., Xu, Q., Koh, T. M., Veldhuis, S. A., . . . Sum, T. C. (2018). Low threshold and efficient multiple exciton generation in halide perovskite nanocrystals. Nature Communications, 9(1), 4137-. doi:10.1038/s41467-018-06596-1||Series/Report no.:||Nature Communications||Abstract:||Multiple exciton generation (MEG) or carrier multiplication, a process that spawns two or more electron–hole pairs from an absorbed high-energy photon (larger than two times bandgap energy Eg), is a promising way to augment the photocurrent and overcome the Shockley–Queisser limit. Conventional semiconductor nanocrystals, the forerunners, face severe challenges from fast hot-carrier cooling. Perovskite nanocrystals possess an intrinsic phonon bottleneck that prolongs slow hot-carrier cooling, transcending these limitations. Herein, we demonstrate enhanced MEG with 2.25Eg threshold and 75% slope efficiency in intermediate-confined colloidal formamidinium lead iodide nanocrystals, surpassing those in strongly confined lead sulfide or lead selenide incumbents. Efficient MEG occurs via inverse Auger process within 90 fs, afforded by the slow cooling of energetic hot carriers. These nanocrystals circumvent the conundrum over enhanced Coulombic coupling and reduced density of states in strongly confined nanocrystals. These insights may lead to the realization of next generation of solar cells and efficient optoelectronic devices.||URI:||https://hdl.handle.net/10356/82965
|DOI:||10.1038/s41467-018-06596-1||Rights:||© 2018 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. 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|
MSE Journal Articles
SPMS Journal Articles
Files in This Item:
|Low threshold and efficient multiple exciton generation in halide perovskite nanocrystals.pdf||1.26 MB||Adobe PDF|
Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.