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Title: Polarized near-infrared intersubband absorptions in CdSe colloidal quantum wells

Abstract

Colloidal quantum wells are two-dimensional materials grown with atomically-precise thickness that dictates their electronic structure. Although intersubband absorption in epitaxial quantum wells is well-known, analogous observations in non-epitaxial two-dimensional materials are sparse. Here in this paper, we show that CdSe nanoplatelet quantum wells have narrow (30–200 meV), polarized intersubband absorption features when photoexcited or under applied bias, which can be tuned by thickness across the near-infrared (NIR) spectral window (900–1600 nm) inclusive of important telecommunications wavelengths. By examination of the optical absorption and polarization-resolved measurements, the NIR absorptions are assigned to electron intersubband transitions. Under photoexcitation, the intersubband features display hot carrier and Auger recombination effects similar to excitonic absorptions. Sequenced two-color photoexcitation permits the sub-picosecond modulation of the carrier temperature in such colloidal quantum wells. This work suggests that colloidal quantum wells may be promising building blocks for NIR technologies.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2];  [3]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [5]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
  2. Univ. of Chicago, IL (United States)
  3. Northwestern Univ., Evanston, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials; Univ. of Chicago, IL (United States)
  5. \Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials; Northwestern Univ., Evanston, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1607376
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Diroll, Benjamin T., Chen, Menglu, Coropceanu, Igor, Williams, Kali R., Talapin, Dmitri V., Guyot-Sionnest, Philippe, and Schaller, Richard D. Polarized near-infrared intersubband absorptions in CdSe colloidal quantum wells. United States: N. p., 2019. Web. doi:10.1038/s41467-019-12503-z.
Diroll, Benjamin T., Chen, Menglu, Coropceanu, Igor, Williams, Kali R., Talapin, Dmitri V., Guyot-Sionnest, Philippe, & Schaller, Richard D. Polarized near-infrared intersubband absorptions in CdSe colloidal quantum wells. United States. https://doi.org/10.1038/s41467-019-12503-z
Diroll, Benjamin T., Chen, Menglu, Coropceanu, Igor, Williams, Kali R., Talapin, Dmitri V., Guyot-Sionnest, Philippe, and Schaller, Richard D. Fri . "Polarized near-infrared intersubband absorptions in CdSe colloidal quantum wells". United States. https://doi.org/10.1038/s41467-019-12503-z. https://www.osti.gov/servlets/purl/1607376.
@article{osti_1607376,
title = {Polarized near-infrared intersubband absorptions in CdSe colloidal quantum wells},
author = {Diroll, Benjamin T. and Chen, Menglu and Coropceanu, Igor and Williams, Kali R. and Talapin, Dmitri V. and Guyot-Sionnest, Philippe and Schaller, Richard D.},
abstractNote = {Colloidal quantum wells are two-dimensional materials grown with atomically-precise thickness that dictates their electronic structure. Although intersubband absorption in epitaxial quantum wells is well-known, analogous observations in non-epitaxial two-dimensional materials are sparse. Here in this paper, we show that CdSe nanoplatelet quantum wells have narrow (30–200 meV), polarized intersubband absorption features when photoexcited or under applied bias, which can be tuned by thickness across the near-infrared (NIR) spectral window (900–1600 nm) inclusive of important telecommunications wavelengths. By examination of the optical absorption and polarization-resolved measurements, the NIR absorptions are assigned to electron intersubband transitions. Under photoexcitation, the intersubband features display hot carrier and Auger recombination effects similar to excitonic absorptions. Sequenced two-color photoexcitation permits the sub-picosecond modulation of the carrier temperature in such colloidal quantum wells. This work suggests that colloidal quantum wells may be promising building blocks for NIR technologies.},
doi = {10.1038/s41467-019-12503-z},
url = {https://www.osti.gov/biblio/1607376}, journal = {Nature Communications},
issn = {2041-1723},
number = 1,
volume = 10,
place = {United States},
year = {2019},
month = {10}
}

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    Works referencing / citing this record:

    Nonparabolicity of size-quantized subbands of bilayer semiconductor quantum wells with heterojunction
    journal, January 2020