High-performance uncooled terahertz （THz） detectors have a wide range of applications in many technological fields， such as high-rate data communications， real-time imaging， spectroscopy and sensing. However， room-temperature THz detectors with high sensitivity and fast response capability are still rare. In recent years， the hot-carrier photothermoelectric （PTE） effect in two-dimensional （2D） materials has been found to be useful for room-temperature， high-speed， and highly sensitive photodetection in the THz and long-wave infrared radiation. In this study， the authors constructed a room-temperature THz detector based on the high-performance 2D layered thermoelectric material Bi₂Te₃， which employs a bow-tie antenna as an asymmetric light coupler and utilizes the hot-carrier PTE effect to achieve THz detection in zero-bias mode. The results show that the Bi₂Te₃ detector exhibits excellent THz detection performance， with a responsivity and noise equivalent power of 0.45 A/W and 17 pW/Hz^1/2， and a fast response time of 12 μs under 100 GHz radiation， respectively. This work demonstrates the promising application of Bi₂Te₃ THz detectors based on the hot-carrier PTE effect in realizing high-performance uncooled THz detectors.