Terahertz (THz) waves, referring to electromagnetic waves with frequency range from 0.1 THz to 10 THz, have many novel and unique properties for a wide range of applications from security to medicine. However, it is relatively difficult to study the physical and chemical processes within this band due to limitation of sensitive terahertz detectors. As one of transition group metal oxides, two-dimensional van der Waals α-MoO3 crystal has relatively high carrier mobility and strong phonon polaritons effects. The relatively weak van der Waals forces between adjacent layers allow various atoms to easily enter into the crystal and interact with the lattice to produce defect states, enabling excellent optoelectronic conversion characteristics. In this study, we fabricate terahertz detectors based on hydrogen atom-intercalated α-MoO3 two-dimensional crystal integrated with log-periodic antenna, which operate from 0.25 THz to 0.37 THz with a maximum optical responsivity of 0.04 V/W.
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