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Title: Near‐Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots

Abstract

Colloidal quantum dots (CQDs) are promising materials for novel light sources and solar energy conversion. However, trap states associated with the CQD surface can produce non-radiative charge recombination that significantly reduces device performance. Here a facile post-synthetic treatment of CdTe CQDs is demonstrated that uses chloride ions to achieve near-complete suppression of surface trapping, resulting in an increase of photoluminescence (PL) quantum yield (QY) from ca. 5% to up to 97.2 ± 2.5%. The effect of the treatment is characterised by absorption and PL spectroscopy, PL decay, scanning transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. We find this process also dramatically improves the air-stability of the CQDs: before treatment the PL is largely quenched after 1 hour of air-exposure, whilst the treated samples showed a PL QY of nearly 50% after more than 12 hours.

Authors:
 [1];  [2];  [2];  [2];  [3];  [3];  [4];  [2];  [2];  [5];  [5];  [5];  [2];  [1];  [2]
+ Show Author Affiliations
  1. FRS, School of Chemistry University of Manchester Manchester M13 9PL UK
  2. School of Physics and Astronomy and Photon Science Institute University of Manchester Manchester M13 9PL UK
  3. School of Materials University of Manchester Manchester M13 9PL UK
  4. Department of Chemistry Vanderbilt University Nashville TN, 37235 USA and Oak Ridge National Laboratory 1 Bethel Valley Road Oak Ridge TN 37831–6071 USA
  5. IOM CNR, Laboratorio Nazionale TASC Area Science Park – Basovizza S.S. 14 Km. 163 5 I‐34149 Basovizza (TS) Italy
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Engineering and Physical Sciences Research Council (EPSRC); European Community’s Seventh Framework Programme
OSTI Identifier:
1237102
Alternate Identifier(s):
OSTI ID: 1237103; OSTI ID: 1263607
Grant/Contract Number:  
EP/K008544/1; 226716; HDTRA1-12-1-0013
Resource Type:
Published Article
Journal Name:
Small
Additional Journal Information:
Journal Name: Small Journal Volume: 11 Journal Issue: 13; Journal ID: ISSN 1613-6810
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; nanocrystalline materials; colloidal quantum dots; photoluminescence; photoelectron spectroscopy; transmission electron microscopy; passivation

Citation Formats

Page, Robert C., Espinobarro‐Velazquez, Daniel, Leontiadou, Marina A., Smith, Charles, Lewis, Edward A., Haigh, Sarah J., Li, Chen, Radtke, Hanna, Pengpad, Atip, Bondino, Federica, Magnano, Elena, Pis, Igor, Flavell, Wendy. R., O'Brien, Paul, and Binks, David J. Near‐Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots. Germany: N. p., 2014. Web. doi:10.1002/smll.201402264.
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Page, Robert C., Espinobarro‐Velazquez, Daniel, Leontiadou, Marina A., Smith, Charles, Lewis, Edward A., Haigh, Sarah J., Li, Chen, Radtke, Hanna, Pengpad, Atip, Bondino, Federica, Magnano, Elena, Pis, Igor, Flavell, Wendy. R., O'Brien, Paul, & Binks, David J. Near‐Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots. Germany. https://doi.org/10.1002/smll.201402264
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Page, Robert C., Espinobarro‐Velazquez, Daniel, Leontiadou, Marina A., Smith, Charles, Lewis, Edward A., Haigh, Sarah J., Li, Chen, Radtke, Hanna, Pengpad, Atip, Bondino, Federica, Magnano, Elena, Pis, Igor, Flavell, Wendy. R., O'Brien, Paul, and Binks, David J. Mon . "Near‐Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots". Germany. https://doi.org/10.1002/smll.201402264.
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@article{osti_1237102,
title = {Near‐Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots},
author = {Page, Robert C. and Espinobarro‐Velazquez, Daniel and Leontiadou, Marina A. and Smith, Charles and Lewis, Edward A. and Haigh, Sarah J. and Li, Chen and Radtke, Hanna and Pengpad, Atip and Bondino, Federica and Magnano, Elena and Pis, Igor and Flavell, Wendy. R. and O'Brien, Paul and Binks, David J.},
abstractNote = {Colloidal quantum dots (CQDs) are promising materials for novel light sources and solar energy conversion. However, trap states associated with the CQD surface can produce non-radiative charge recombination that significantly reduces device performance. Here a facile post-synthetic treatment of CdTe CQDs is demonstrated that uses chloride ions to achieve near-complete suppression of surface trapping, resulting in an increase of photoluminescence (PL) quantum yield (QY) from ca. 5% to up to 97.2 ± 2.5%. The effect of the treatment is characterised by absorption and PL spectroscopy, PL decay, scanning transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. We find this process also dramatically improves the air-stability of the CQDs: before treatment the PL is largely quenched after 1 hour of air-exposure, whilst the treated samples showed a PL QY of nearly 50% after more than 12 hours.},
doi = {10.1002/smll.201402264},
journal = {Small},
number = 13,
volume = 11,
place = {Germany},
year = {Mon Oct 27 00:00:00 EDT 2014},
month = {Mon Oct 27 00:00:00 EDT 2014}
}
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https://doi.org/10.1002/smll.201402264
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