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Title: Quantum coherence of multiple excitons governs absorption cross-sections of PbS/CdS core/shell nanocrystals
Authors: Tahara, Hirokazu  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-0738-5623 (unconfirmed)
Sakamoto, Masanori  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-5018-5590 (unconfirmed)
Teranishi, Toshiharu  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-5818-8865 (unconfirmed)
Kanemitsu, Yoshihiko  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-0788-131X (unconfirmed)
Author's alias: 田原, 弘量
坂本, 雅典
寺西, 利治
金光, 義彦
Keywords: Nanoparticles
Nanophotonics and plasmonics
Issue Date: 9-Aug-2018
Publisher: Springer Nature
Journal title: Nature Communications
Volume: 9
Thesis number: 3179
Abstract: Multiple excitons in semiconductor nanocrystals have been extensively studied with respect to unique carrier dynamics including quantized Auger recombination and implementation in optoelectronic devices such as solar cells and photodetectors. However, the generation mechanism of multiple excitons still remains unclear. Here, we study instantaneous and delayed multiple exciton generation processes in PbS/CdS core/shell nanocrystals. The absorption cross-sections of biexcitons and triexcitons are identical to that of single excitons under instantaneous excitation with a single pulse. In contrast, the delayed excitation using double pulses shows a reduction of the biexciton and triexciton absorption cross-sections. Our theoretical analysis reveals that the excitonic coherence assists the generation of multiple excitons and that the reduction of multiple exciton absorption cross-sections is caused by the reduction of coherent excitation pathways. We clarify that exciton coherences play a key role in multiple exciton generation processes and seamlessly connect the identical and reduced multiple exciton absorption cross-sections.
Description: 半導体ナノ粒子の光吸収効率の増加メカニズムを解明 --高効率な太陽電池や光検出器へ期待--. 京都大学プレスリリース. 2018-08-22.
Rights: © The Author(s) 2018. 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/.
URI: http://hdl.handle.net/2433/233944
DOI(Published Version): 10.1038/s41467-018-05698-0
PubMed ID: 30093691
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2018-08-22
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