Archive > Volume 20 Issue 11 > 2024,20(11):641-646. DOI:https://doi.org/10.1007/s11801-024-3236-9 CSTR:[cstr] Prev Next
Room-temperature nitrogen-rich niobium nitride photodetector for terahertz detection
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Abstract:
A sensitive room-temperature metal-semiconductor-metal (MSM) structure is fabricated on high-resistivity silicon substrates (ρ>4 000 Ω.cm) for terahertz (THz) detection by utilizing the photoconductive effect. When radiation is absorbed by the nitrogen-rich niobium nitride, the number of free electrons and electrical conductivity increase. The detector without an attached antenna boasts a voltage responsivity of 7 058 V/W at a frequency of 310 GHz as well as small noise density of 3.5 nV/Hz0.5 for a noise equivalent power of about 0.5 pW/Hz0.5. The device fabricated by the standard silicon processing technology has large potential in high-sensitivity THz remote sensing, communication, and materials detection.
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