期刊
JOURNAL OF APPLIED PHYSICS
卷 132, 期 6, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0099544
关键词
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资金
- National Natural Science Foundation of China (NSFC)
- Natural Science Foundation of Jiangsu Province
- Suzhou Science and Technology Plan Projects
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institution
- [62120106001]
- [61875143]
- [61905170]
- [BK20190816]
- [SYG202124]
In this study, the effect of strain on hot-carrier devices in gold material was investigated using calculations and simulations. The results show that compressive strain can increase hot-electron generation and improve the transport of hot carriers, leading to enhanced quantum efficiency and responsivity of the devices.
Hot-carrier devices in metal-semiconductor junctions have attracted considerable attention but still with quantum efficiencies far from expectations. Introducing the lattice strain to the material can effectively modulate the electronic structure, providing a way to control the hot-carrier dynamics. Here, we study how this strain affects the generation, transport, and injection of hot carriers in gold (Au) by using first-principles calculations and evaluate the overall responses of Au-based hot-carrier devices by Monte Carlo simulation. We find that the compressive strain can significantly increase the hot-electron generation from direct transition at E > 1.1 eV for Au. The compressive strain delocalizes the band structure and decreases the electron density of state, which, in turn, reduce electron-electron and electron-phonon scatterings to improve the transport of hot carriers. Taking the Au/TiO2 device as an example, we find that the compressive strain (-6%) can enable a 1.5- to 3-fold enhancement of quantum efficiency and responsivity at a photon energy between 1.2 and 3 eV. Published under an exclusive license by AIP Publishing.
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