High-performance broadband photodetector based on PdSe2/black phosphorus heterodiode

Abstract

Uncooled long-wavelength infrared photodetectors based on two-dimensional materials have wide applications, such as remote sensing, missile guide, imaging, and night vision. However, realizing high-performance photodetectors based on 2D materials with high photoresponsivity and fast response speed is still a challenge. Here, we report an ultra-broadband photodetector based on the PdSe2/BP van der Waals heterodiode with a fast response speed. The detection range of the PdSe2/BP heterodiode is covered from visible to long-wave infrared (0.4–10.6  μm). A high photoresponsivity of 116.0 A/W and a low noise equivalence power of 8.4 × 10−16 W/Hz1/2 and D* of 2.05 × 109 cm Hz1/2/W were demonstrated. Notably, the heterodiode exhibits a very fast response speed with τr = 2.9 and τd = 4.0  μs. Our results introduced a promising application in broadband and fast photoresponse at weak light intensity.