DataVXACS Energy LettersPaper
journal article·2024-05-10

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

Qian Zheng, Junfeng Wang, Fei Huang, Zheng Huang, Shuyu Tian, Qing Chen, Yi Pei, Kaibo Zheng, Jianjun Tian

ACS Energy Letters· Volume 9· Issue 5
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Source abstract

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 In 3+ gradient doping in the ZnSe shell of InP QD to construct core/shell structural InP/ZnSe-G-In QDs. The In 3+ 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 2, 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.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Quantum Dots Synthesis And Properties · Advanced Photocatalysis Techniques · Ga2O3 and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, P. R. China

Sauvage Laboratory for Smart Materials, School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China

BNU-HKUST Laboratory of Green Innovation, Advanced Institute of Natural Sciences, Beijing Normal University at Zhuhai, Zhuhai 519087, China

Chemical Physics and Nano, Lund University, 22100 Lund, Sweden

Funding

Vetenskapsrådet · National Key Research and Development Program of China · Basic and Applied Basic Research Foundation of Guangdong Province · Swedish Foundation for International Cooperation in Research and Higher Education · Villum Fonden · Beijing Municipal Natural Science Foundation · National Natural Science Foundation of China

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