Constructing InP/ZnSe Quantum Dots with Shell Gradient In3+ Doping for Photoelectrochemical Cells
(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
- Zheng, Qian ; Wang, Junfeng ; Huang, Fei ; Huang, Zheng ; Tian, Shuyu ; Chen, Qing ; Pei, Yi ; Zheng, Kaibo LU and Tian, Jianjun
- organization
- publishing date
- 2024
- 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}}, }