期刊
NANO ENERGY
卷 53, 期 -, 页码 116-124出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.08.042
关键词
Pyramidal structure; Quantum dots; Water splitting; Core/thick-shell; Hydrogen generation
类别
资金
- Qingdao University
- Natural Science Foundation of Shandong Province [ZR2018MB001]
- Knut & Alice Wallenberg Foundation
- Swedish Foundations Consolidator Fellowship
- LTU Lab fund program
- Kempe Foundation
- European Union's Horizon 2020 research and innovation programme [654002]
- Recruitment Program of High-end Foreign Experts [GDW20163500110, GDW20173500154]
- Taishan Scholar Program of Shandong Province, China
- Qingdao International Center for Semiconductor Photoelectric Nanomaterials
- Shandong Provincial University Key Laboratory of Optoelectrical Material Physics and Devices
Colloidal semiconductor quantum dots (QDs) have attracted a great attention for their potential applications in optoelectronic devices, such as water splitting, luminescent solar concentrators, and solar cells, because of their size/shape/composition-dependent optoelectronic properties. However, the fast electron-hole (e-h) recombination and slow charge separation of QDs limit their applications as light absorbers in high-efficiency optoelectronic devices. Here, we synthesized thick-shell CdSe/CdSexS1-x/CdS QDs with pyramidal shape, which exhibit a quantum yield of similar to 15%, with a long radiative lifetime up to similar to 100 ns due to the spatial separation of the e/h wavefunction and significantly broadened light absorption toward the 500-700 nm range, compared to CdSe/CdS unalloyed QDs. As a proof-of-concept, the pyramidal QDs are applied as light absorbers in a photo-electrochemical (PEC) system, leading to a saturated photocurrent density of similar to 12 mA/cm(2) (with a H-2 generation rate of 90 mL cm(-2) day(-1)), which is a record for thick-shell QD-based photoelectrodes in PEC hydrogen generation. Core/thick-shell QDs hold great potential for breakthrough developments in the field of QD-based optoelectronic devices.
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