Photodetection performance of TiS3 nanoribbons studied by optical pump: terahertz probe spectroscopy

Titanium trisulfide (TiS3) is an important representative of nanomaterials, which are regarded as significant candidates for nanoscale optoelectronics. Due to the promising high intrinsic charge -carrier mobility, it has been proposed as a high performance visible and nearinfrared -resistive photodetector with excellent stability. However, the conventional diagnostics of such materials require specific sample preparation. Here, we present the effective utility of the optical pump-terahertz probe technique for the additional photodetector characterization, which is deprived of these shortcomings. In particular, we non -invasively determined the lifetime of charge carriers of 80 ps at a pump fluence F = 1.6 mu Jcm-2. The responsivity, which is defined in our research, was R= increment sigma/F = 84 x 104 m2/ohm J. The quantum efficiency Q.E. = Ne/Nph = 3 x 104. These characteristics confirm that TiS3 nanoribbons are a highly desirable material for optoelectronic devices.