期刊
ADVANCED ENERGY MATERIALS
卷 11, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202101230
关键词
colloidal quantum dots; charge carrier dynamics; Cu-doped InP; ZnSe; heavy metal-free; photoelectrochemical hydrogen generation
类别
资金
- National Key Research and Development Program of China [2019YFE0121600, 2019YFB2203400]
- Sichuan Science and Technology Program [2021YFH0054]
- 111 Project [B20030]
A controllable Cu shell doping approach has been reported to enhance the optoelectronic properties of InP/ZnSe core/shell quantum dots for high performance and stable solar energy conversion. The Cu-doped core/shell QDs exhibit improved photo-induced electron transfer rate and enhanced photocurrent density and long-term durability. The results suggest that Cu doping in the shell has a significant impact on the optoelectronic properties of the core/shell QDs, potentially opening up new avenues for customized eco-friendly QDs for efficient solar energy conversion.
As emerging eco-friendly alternatives to traditional Cd/Pb-based quantum dots (QDs), InP/ZnSe(S) core/shell QDs have demonstrated huge potential in light-emitting technologies. So far, these QDs have been rarely employed in solar energy conversion applications due to their type-I band structure offering limited photo-induced charge carrier separation and transfer. Here, a controllable Cu shell doping approach is reported to engineer the optoelectronic properties of InP/ZnSe core/shell QDs and realize high performance and stable solar-driven photoelectrochemical (PEC) hydrogen evolution. As compared to the pristine InP/ZnSe QDs, the Cu-doped core/shell QDs exhibit enhances the photo-induced electron transfer rate due to the capture of photo-generated holes via Cu impurity states in the shell, leading to improved photocurrent density and long-term durability in as-fabricated InP/ZnSe:Cu QDs-PEC devices under standard one sun illumination. The results indicate that the doping of Cu in the shell has a preeminent effect on the optoelectronic properties of the core/shell QDs and may open up new avenues to tailor eco-friendly core/shell QDs for high performance and stable solar energy conversion.
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