Bright trion emission from semiconductor nanoplatelets
Abstract
The trion, a quasiparticle comprising one exciton and an additional charge carrier, offers unique opportunities for generating spin-photon interfaces that can be used in developing quantum networks. Trions are also actively sought after for integrated optoelectronic devices including photovoltaics, photodetectors, and spintronics. However, formation of trions in strongly confined low-dimensional materials is often deemed detrimental. This is because trion emission in such materials is typically prohibited due to the predominant nonradiative Auger recombination processes. Semiconductor nanoplatelets with their strong confinement in the thickness direction and extended lateral geometries exhibit large exciton coherence sizes and reduced carrier-carrier interactions that may enable unprecedented trion properties. In this paper, we perform optical spectroscopic studies of individual CdSe nanoplatelets at cryogenic temperatures and observe bright trion emission with intensities comparable to that of neutral exciton emission. We perform carrier dynamics studies of the nanoplatelets and find that due to their extended lateral geometry, the fast radiative decay rate of the nanoplatelets at cryogenic temperatures is comparable to the inhibited Auger recombination rate, leading to the bright trion emission. Our tight-binding theory further reveals distinct size-tunable trion emission in the nanoplatelets that is advantageous for efficient trion emission. These properties make semiconductor nanoplatelets potential candidatesmore »
- Authors:
-
[2];
[2];
[1]
- Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
- Univ. of Chicago, IL (United States)
- Univ. of Ottowa, Ontario (Canada)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Alexander von Humboldt Foundation; Natural Sciences and Engineering Research Council of Canada (NSERC); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR)
- OSTI Identifier:
- 1632176
- Grant/Contract Number:
- AC02-06CH11357; CHE-1611331; FA9550-18-1-0099
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 5; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Electronic structure; Excitons; Trions; Nanostructures; Photon counting; Tight-binding model
Citation Formats
Peng, Lintao, Otten, Matthew, Hazarika, Abhijit, Coropceanu, Igor, Cygorek, Moritz, Wiederrecht, Gary P., Hawrylak, Pawel, Talapin, Dmitri V., and Ma, Xuedan. Bright trion emission from semiconductor nanoplatelets. United States: N. p., 2020.
Web. doi:10.1103/PhysRevMaterials.4.056006.
Peng, Lintao, Otten, Matthew, Hazarika, Abhijit, Coropceanu, Igor, Cygorek, Moritz, Wiederrecht, Gary P., Hawrylak, Pawel, Talapin, Dmitri V., & Ma, Xuedan. Bright trion emission from semiconductor nanoplatelets. United States. https://doi.org/10.1103/PhysRevMaterials.4.056006
Peng, Lintao, Otten, Matthew, Hazarika, Abhijit, Coropceanu, Igor, Cygorek, Moritz, Wiederrecht, Gary P., Hawrylak, Pawel, Talapin, Dmitri V., and Ma, Xuedan. Fri .
"Bright trion emission from semiconductor nanoplatelets". United States. https://doi.org/10.1103/PhysRevMaterials.4.056006. https://www.osti.gov/servlets/purl/1632176.
@article{osti_1632176,
title = {Bright trion emission from semiconductor nanoplatelets},
author = {Peng, Lintao and Otten, Matthew and Hazarika, Abhijit and Coropceanu, Igor and Cygorek, Moritz and Wiederrecht, Gary P. and Hawrylak, Pawel and Talapin, Dmitri V. and Ma, Xuedan},
abstractNote = {The trion, a quasiparticle comprising one exciton and an additional charge carrier, offers unique opportunities for generating spin-photon interfaces that can be used in developing quantum networks. Trions are also actively sought after for integrated optoelectronic devices including photovoltaics, photodetectors, and spintronics. However, formation of trions in strongly confined low-dimensional materials is often deemed detrimental. This is because trion emission in such materials is typically prohibited due to the predominant nonradiative Auger recombination processes. Semiconductor nanoplatelets with their strong confinement in the thickness direction and extended lateral geometries exhibit large exciton coherence sizes and reduced carrier-carrier interactions that may enable unprecedented trion properties. In this paper, we perform optical spectroscopic studies of individual CdSe nanoplatelets at cryogenic temperatures and observe bright trion emission with intensities comparable to that of neutral exciton emission. We perform carrier dynamics studies of the nanoplatelets and find that due to their extended lateral geometry, the fast radiative decay rate of the nanoplatelets at cryogenic temperatures is comparable to the inhibited Auger recombination rate, leading to the bright trion emission. Our tight-binding theory further reveals distinct size-tunable trion emission in the nanoplatelets that is advantageous for efficient trion emission. These properties make semiconductor nanoplatelets potential candidates as photon sources for optoelectronic and quantum logic devices.},
doi = {10.1103/PhysRevMaterials.4.056006},
journal = {Physical Review Materials},
number = 5,
volume = 4,
place = {United States},
year = {Fri May 15 00:00:00 EDT 2020},
month = {Fri May 15 00:00:00 EDT 2020}
}
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