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Constructing InP/ZnSe Quantum Dots with Shell Gradient In3+ Doping for Photoelectrochemical Cells

Zheng, Qian ; Wang, Junfeng ; Huang, Fei ; Huang, Zheng ; Tian, Shuyu ; Chen, Qing ; Pei, Yi ; Zheng, Kaibo LU and Tian, Jianjun (2024) In ACS Energy Letters 9(5). p.2358-2366
Abstract

Environmentally friendly InP/ZnSe core/shell quantum dots (QDs) with high absorption coefficients and tunable band gaps have demonstrated great potential for photoelectrochemical (PEC) water splitting. However, the tightly bound excitonic feature by inherent type I band alignment tends to reduce the charge separation efficiency, limiting their PEC performance. Herein, we devised heterovalent In3+ gradient doping in the ZnSe shell of InP QD to construct core/shell structural InP/ZnSe-G-In QDs. The In3+ dopant increased the Fermi level of the ZnSe shell; thus continuous semiconductor homojunction and band bending were formed by gradient composition doping, which accelerates the exciton separation through the built-in... (More)

Environmentally friendly InP/ZnSe core/shell quantum dots (QDs) with high absorption coefficients and tunable band gaps have demonstrated great potential for photoelectrochemical (PEC) water splitting. However, the tightly bound excitonic feature by inherent type I band alignment tends to reduce the charge separation efficiency, limiting their PEC performance. Herein, we devised heterovalent In3+ gradient doping in the ZnSe shell of InP QD to construct core/shell structural InP/ZnSe-G-In QDs. The In3+ dopant increased the Fermi level of the ZnSe shell; thus continuous semiconductor homojunction and band bending were formed by gradient composition doping, which accelerates the exciton separation through the built-in electric field. As a result, the PEC cells based on such QDs exhibited high photocurrent density of 8.7 mA/cm2, demonstrating one of the highest values for the InP-based QDs PEC cells. This work provides an effective strategy for the application of type I band structure QDs in solar energy conversion.

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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
ACS Energy Letters
volume
9
issue
5
pages
9 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85191791016
ISSN
2380-8195
DOI
10.1021/acsenergylett.4c00508
language
English
LU publication?
yes
id
8304b659-e458-4307-8e2f-3b8a4a3e663c
date added to LUP
2024-05-15 11:54:14
date last changed
2024-05-28 14:13:18
@article{8304b659-e458-4307-8e2f-3b8a4a3e663c,
  abstract     = {{<p>Environmentally friendly InP/ZnSe core/shell quantum dots (QDs) with high absorption coefficients and tunable band gaps have demonstrated great potential for photoelectrochemical (PEC) water splitting. However, the tightly bound excitonic feature by inherent type I band alignment tends to reduce the charge separation efficiency, limiting their PEC performance. Herein, we devised heterovalent In<sup>3+</sup> gradient doping in the ZnSe shell of InP QD to construct core/shell structural InP/ZnSe-G-In QDs. The In<sup>3+</sup> dopant increased the Fermi level of the ZnSe shell; thus continuous semiconductor homojunction and band bending were formed by gradient composition doping, which accelerates the exciton separation through the built-in electric field. As a result, the PEC cells based on such QDs exhibited high photocurrent density of 8.7 mA/cm<sup>2</sup>, demonstrating one of the highest values for the InP-based QDs PEC cells. This work provides an effective strategy for the application of type I band structure QDs in solar energy conversion.</p>}},
  author       = {{Zheng, Qian and Wang, Junfeng and Huang, Fei and Huang, Zheng and Tian, Shuyu and Chen, Qing and Pei, Yi and Zheng, Kaibo and Tian, Jianjun}},
  issn         = {{2380-8195}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{2358--2366}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Energy Letters}},
  title        = {{Constructing InP/ZnSe Quantum Dots with Shell Gradient In<sup>3+</sup> Doping for Photoelectrochemical Cells}},
  url          = {{http://dx.doi.org/10.1021/acsenergylett.4c00508}},
  doi          = {{10.1021/acsenergylett.4c00508}},
  volume       = {{9}},
  year         = {{2024}},
}