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• W4287447718 abstract "Hot-carrier photodetectors have been extensively studied in recent years, but still exhibit particularly low efficiencies. The physics behind this is closely related to the intrinsic electronic structures of hot-carrier materials. Transition-metal carbides and nitrides (TMCNs) show intriguing potential for high-performance hot-carrier applications; however, a systematic study from the electronic structure perspective remains elusive. Herein, we study the underlying physics, including the electronic structures, hot-carrier energy distribution, electron-electron and electron-phonon scatterings, and hot-carrier injection for TMCNs by first-principles calculation and Monte Carlo simulations. We investigate the complete hot-carrier behavior from the microscopic dynamics (e.g., generation, transport, and injection) of hot carriers to the macroscopic responses (e.g., device responsivity) of the photodetectors. It is found that a well-manipulated electronic structure can greatly improve the performance of hot-carrier photodetectors. Our systematic study shows that hot-carrier systems based on $mathrm{Hf}mathrm{C}$, $mathrm{Zr}mathrm{N}$, or $mathrm{Ta}mathrm{C}$ display significantly higher efficiencies, benefitting from their better electronic structures; in particular, the unbiased responsivity of the $mathrm{Zr}mathrm{N}/{mathrm{Ti}mathrm{O}}_{2}$ system can be up to 20 mA/W at a wavelength of 1033 nm, which is about 70 times higher than that of the conventional $mathrm{Au}$ system, enabling the realization of high-performance hot-carrier photodetectors by using non-noble metals." @default.
• W4287447718 created "2022-07-25" @default.
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• W4287447718 date "2022-07-25" @default.
• W4287447718 modified "2023-10-16" @default.
• W4287447718 title "Hot-Carrier Physics of Transition-Metal Carbides and Nitrides: Insight from Electronic Structure" @default.
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• W4287447718 doi "https://doi.org/10.1103/physrevapplied.18.014058" @default.
• W4287447718 hasPublicationYear "2022" @default.
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