Manipulating Charge Transfer from Core to Shell in CdSe/CdS/Au Heterojunction Quantum Dots

Exian Liu; Hua Zhu; Jun Yi; Kanishka Kobbekaduwa; Pan Adhikari; Jianjun Liu; Ying Shi; Jianbing Zhang; Hongbo Li; Ana Oprisan; Apparao M. Rao; Hugo Sanabria; Ou Chen; Jianbo Gao

doi:10.1021/acsami.9b17339

Manipulating Charge Transfer from Core to Shell in CdSe/CdS/Au Heterojunction Quantum Dots

Exian Liu, Hua Zhu, Jun Yi, Kanishka Kobbekaduwa, Pan Adhikari, Jianjun Liu, Ying Shi, Jianbing Zhang, Hongbo Li, Ana Oprisan, Apparao M. Rao, Hugo Sanabria^*, Ou Chen, Jianbo Gao

^*Corresponding author for this work

School of Material Science and Engineering

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

12 Citations (Scopus)

Abstract

The photophysics of charge-transfer and recombination mechanisms in a heterojunction structure of CdSe/CdS/Au quantum dots (QDs) are studied by temperature-dependent steady-state photoluminescence (PL) and time-resolved PL (TRPL). We manipulate the charge transfer from core to shell surface by varying the tunneling barrier height resulting from temperature variation and the barrier width resulting from shell thickness variation. The charge-transfer process, which can be described by a tunneling transmission model, is manifested by two competitive recombination processes, an intrinsic exciton emission and a trap emission in the near-infrared (NIR) range. Our study establishes the photophysics foundation for the core/shell/metal application in photocatalyst and optoelectronics.

Original language	English
Pages (from-to)	48551-48555
Number of pages	5
Journal	ACS applied materials & interfaces
Volume	11
Issue number	51
DOIs	https://doi.org/10.1021/acsami.9b17339
Publication status	Published - 26 Dec 2019

Keywords

core/shell
photoluminescence
recombination
steady state
time resolved
tunneling

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10.1021/acsami.9b17339

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@article{faa5e7cd580f4ec8b76b458823e3c71d,

title = "Manipulating Charge Transfer from Core to Shell in CdSe/CdS/Au Heterojunction Quantum Dots",

abstract = "The photophysics of charge-transfer and recombination mechanisms in a heterojunction structure of CdSe/CdS/Au quantum dots (QDs) are studied by temperature-dependent steady-state photoluminescence (PL) and time-resolved PL (TRPL). We manipulate the charge transfer from core to shell surface by varying the tunneling barrier height resulting from temperature variation and the barrier width resulting from shell thickness variation. The charge-transfer process, which can be described by a tunneling transmission model, is manifested by two competitive recombination processes, an intrinsic exciton emission and a trap emission in the near-infrared (NIR) range. Our study establishes the photophysics foundation for the core/shell/metal application in photocatalyst and optoelectronics.",

keywords = "core/shell, photoluminescence, recombination, steady state, time resolved, tunneling",

author = "Exian Liu and Hua Zhu and Jun Yi and Kanishka Kobbekaduwa and Pan Adhikari and Jianjun Liu and Ying Shi and Jianbing Zhang and Hongbo Li and Ana Oprisan and Rao, {Apparao M.} and Hugo Sanabria and Ou Chen and Jianbo Gao",

note = "Publisher Copyright: Copyright {\textcopyright} 2019 American Chemical Society.",

year = "2019",

month = dec,

day = "26",

doi = "10.1021/acsami.9b17339",

language = "English",

volume = "11",

pages = "48551--48555",

journal = "ACS applied materials & interfaces",

issn = "1944-8244",

publisher = "American Chemical Society",

number = "51",

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TY - JOUR

T1 - Manipulating Charge Transfer from Core to Shell in CdSe/CdS/Au Heterojunction Quantum Dots

AU - Liu, Exian

AU - Zhu, Hua

AU - Yi, Jun

AU - Kobbekaduwa, Kanishka

AU - Adhikari, Pan

AU - Liu, Jianjun

AU - Shi, Ying

AU - Zhang, Jianbing

AU - Li, Hongbo

AU - Oprisan, Ana

AU - Rao, Apparao M.

AU - Sanabria, Hugo

AU - Chen, Ou

AU - Gao, Jianbo

PY - 2019/12/26

Y1 - 2019/12/26

N2 - The photophysics of charge-transfer and recombination mechanisms in a heterojunction structure of CdSe/CdS/Au quantum dots (QDs) are studied by temperature-dependent steady-state photoluminescence (PL) and time-resolved PL (TRPL). We manipulate the charge transfer from core to shell surface by varying the tunneling barrier height resulting from temperature variation and the barrier width resulting from shell thickness variation. The charge-transfer process, which can be described by a tunneling transmission model, is manifested by two competitive recombination processes, an intrinsic exciton emission and a trap emission in the near-infrared (NIR) range. Our study establishes the photophysics foundation for the core/shell/metal application in photocatalyst and optoelectronics.

AB - The photophysics of charge-transfer and recombination mechanisms in a heterojunction structure of CdSe/CdS/Au quantum dots (QDs) are studied by temperature-dependent steady-state photoluminescence (PL) and time-resolved PL (TRPL). We manipulate the charge transfer from core to shell surface by varying the tunneling barrier height resulting from temperature variation and the barrier width resulting from shell thickness variation. The charge-transfer process, which can be described by a tunneling transmission model, is manifested by two competitive recombination processes, an intrinsic exciton emission and a trap emission in the near-infrared (NIR) range. Our study establishes the photophysics foundation for the core/shell/metal application in photocatalyst and optoelectronics.

KW - core/shell

KW - photoluminescence

KW - recombination

KW - steady state

KW - time resolved

KW - tunneling

UR - http://www.scopus.com/inward/record.url?scp=85076789738&partnerID=8YFLogxK

U2 - 10.1021/acsami.9b17339

DO - 10.1021/acsami.9b17339

M3 - Article

C2 - 31782302

AN - SCOPUS:85076789738

SN - 1944-8244

VL - 11

SP - 48551

EP - 48555

JO - ACS applied materials & interfaces

JF - ACS applied materials & interfaces

IS - 51

ER -

Manipulating Charge Transfer from Core to Shell in CdSe/CdS/Au Heterojunction Quantum Dots

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Keywords

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