▎ 摘　　要

Uncooled terahertz photodetectors (PDs) showing fast (ps) response and high sensitivity (noise equivalent power (NEP) < nW/Hz(1/2)) over a broad (0.5-10 THz) frequency range are needed for applications in high-resolution spectroscopy (relative accuracy similar to 10(-11)), metrology, quantum information, security, imaging, optical communications. However, present terahertz receivers cannot provide the required balance between sensitivity, speed, operation temperature, and frequency range. Here, we demonstrate uncooled terahertz PDs combining the low (similar to 2000 k(B) mu m(-2)) electronic specific heat of high mobility (>50 000 cm(2) s(-1)) hexagonal boron nitride-encapsulated graphene, with asymmetric field enhancement produced by a bow-tie antenna, resonating at 3 THz. This produces a strong photo-thermoelectric conversion, which simultaneously leads to a combination of high sensitivity (NEP