Zero-Biased and Broadband (0.1–1.5 THz) Terahertz Detector Using Dirac Semimetal-Platinum Telluride (PtTe₂)

Abstract

This letter demonstrates the Dirac semimetal-platinum telluride (PtTe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> )-based terahertz detector. The reported detector has a broadband response ranging from 0.1 to 1.5 THz at room temperature. The antenna-coupled PtTe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> device can perform at zero bias with a maximum responsivity of 16.4 A/W at 0.2 THz. In contrast, the two fold increase in responsivity is observed with bias (100 mV). Furthermore, even at the highest source frequency (1.5 THz), the detector at zero bias exhibits higher responsivity (6.1 A/W), lower noise-equivalent power (1.5 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−11</sup> WHz <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1/2</sup> ), and higher detectivity (5.3 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">9</sup> cm·Hz <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.5</sup> /W). Therefore, the proposed PtTe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -based detector manifests better performance than variously reported terahertz detectors. These improved device performances and one mask fabrication process validate their worth for detection and sensing in the terahertz domain.