Single Trap States in Single CdSe Nanoplatelets

Stijn O.M. Hinterding; Bastiaan B.V. Salzmann; Sander J.W. Vonk; Daniel Vanmaekelbergh; Bert M. Weckhuysen; Eline M. Hutter; Freddy T. Rabouw

doi:10.1021/acsnano.1c00481

Single Trap States in Single CdSe Nanoplatelets

Stijn O.M. Hinterding, Bastiaan B.V. Salzmann, Sander J.W. Vonk, Daniel Vanmaekelbergh, Bert M. Weckhuysen, Eline M. Hutter, Freddy T. Rabouw^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Trap states can strongly affect semiconductor nanocrystals, by quenching, delaying, and spectrally shifting the photoluminescence (PL). Trap states have proven elusive and difficult to study in detail at the ensemble level, let alone in the single-trap regime. CdSe nanoplatelets (NPLs) exhibit significant fractions of long-lived "delayed emission"and near-infrared "trap emission". We use these two spectroscopic handles to study trap states at the ensemble and the single-particle level. We find that reversible hole trapping leads to both delayed and trap PL, involving the same trap states. At the single-particle level, reversible trapping induces exponential delayed PL and trap PL, with lifetimes ranging from 40 to 1300 ns. In contrast with exciton PL, single-trap PL is broad and shows spectral diffusion and strictly single-photon emission. Our results highlight the large inhomogeneity of trap states, even at the single-particle level.

Original language	English
Pages (from-to)	7216-7225
Number of pages	10
Journal	ACS Nano
Volume	15
Issue number	4
DOIs	https://doi.org/10.1021/acsnano.1c00481
Publication status	Published - 27 Apr 2021

Bibliographical note

Funding Information:
This work was supported by The Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWO Gravitation Programme funded by the Ministry of Education, Culture and Science of the government of The Netherlands. B.S. and D.V. wish to acknowledge the Dutch Research Council NWO (TOP-grant with project no. 715.016.002). D.V. wishes to acknowledge the European Research Council (ERC Advanced Grant “First Step” no. 692691). E.M.H. acknowledges support from the Dutch Research Council NWO (VI.Veni.192.034). S.J.W.V. and F.T.R. acknowledge financial support from the Dutch Research Council NWO (VENI-722.017.002 and OCENW.KLEIN.008).

Publisher Copyright:
©

Funding

This work was supported by The Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWO Gravitation Programme funded by the Ministry of Education, Culture and Science of the government of The Netherlands. B.S. and D.V. wish to acknowledge the Dutch Research Council NWO (TOP-grant with project no. 715.016.002). D.V. wishes to acknowledge the European Research Council (ERC Advanced Grant “First Step” no. 692691). E.M.H. acknowledges support from the Dutch Research Council NWO (VI.Veni.192.034). S.J.W.V. and F.T.R. acknowledge financial support from the Dutch Research Council NWO (VENI-722.017.002 and OCENW.KLEIN.008).

Keywords

CdSe nanoplatelets
single-particle spectroscopy
spectral diffusion
transient absorption
trap states

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Cite this

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title = "Single Trap States in Single CdSe Nanoplatelets",

abstract = "Trap states can strongly affect semiconductor nanocrystals, by quenching, delaying, and spectrally shifting the photoluminescence (PL). Trap states have proven elusive and difficult to study in detail at the ensemble level, let alone in the single-trap regime. CdSe nanoplatelets (NPLs) exhibit significant fractions of long-lived {"}delayed emission{"}and near-infrared {"}trap emission{"}. We use these two spectroscopic handles to study trap states at the ensemble and the single-particle level. We find that reversible hole trapping leads to both delayed and trap PL, involving the same trap states. At the single-particle level, reversible trapping induces exponential delayed PL and trap PL, with lifetimes ranging from 40 to 1300 ns. In contrast with exciton PL, single-trap PL is broad and shows spectral diffusion and strictly single-photon emission. Our results highlight the large inhomogeneity of trap states, even at the single-particle level. ",

keywords = "CdSe nanoplatelets, single-particle spectroscopy, spectral diffusion, transient absorption, trap states",

author = "Hinterding, {Stijn O.M.} and Salzmann, {Bastiaan B.V.} and Vonk, {Sander J.W.} and Daniel Vanmaekelbergh and Weckhuysen, {Bert M.} and Hutter, {Eline M.} and Rabouw, {Freddy T.}",

note = "Funding Information: This work was supported by The Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWO Gravitation Programme funded by the Ministry of Education, Culture and Science of the government of The Netherlands. B.S. and D.V. wish to acknowledge the Dutch Research Council NWO (TOP-grant with project no. 715.016.002). D.V. wishes to acknowledge the European Research Council (ERC Advanced Grant “First Step” no. 692691). E.M.H. acknowledges support from the Dutch Research Council NWO (VI.Veni.192.034). S.J.W.V. and F.T.R. acknowledge financial support from the Dutch Research Council NWO (VENI-722.017.002 and OCENW.KLEIN.008). Publisher Copyright: {\textcopyright} ",

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AU - Weckhuysen, Bert M.

AU - Hutter, Eline M.

AU - Rabouw, Freddy T.

N1 - Funding Information: This work was supported by The Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWO Gravitation Programme funded by the Ministry of Education, Culture and Science of the government of The Netherlands. B.S. and D.V. wish to acknowledge the Dutch Research Council NWO (TOP-grant with project no. 715.016.002). D.V. wishes to acknowledge the European Research Council (ERC Advanced Grant “First Step” no. 692691). E.M.H. acknowledges support from the Dutch Research Council NWO (VI.Veni.192.034). S.J.W.V. and F.T.R. acknowledge financial support from the Dutch Research Council NWO (VENI-722.017.002 and OCENW.KLEIN.008). Publisher Copyright: ©

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N2 - Trap states can strongly affect semiconductor nanocrystals, by quenching, delaying, and spectrally shifting the photoluminescence (PL). Trap states have proven elusive and difficult to study in detail at the ensemble level, let alone in the single-trap regime. CdSe nanoplatelets (NPLs) exhibit significant fractions of long-lived "delayed emission"and near-infrared "trap emission". We use these two spectroscopic handles to study trap states at the ensemble and the single-particle level. We find that reversible hole trapping leads to both delayed and trap PL, involving the same trap states. At the single-particle level, reversible trapping induces exponential delayed PL and trap PL, with lifetimes ranging from 40 to 1300 ns. In contrast with exciton PL, single-trap PL is broad and shows spectral diffusion and strictly single-photon emission. Our results highlight the large inhomogeneity of trap states, even at the single-particle level.

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Single Trap States in Single CdSe Nanoplatelets

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