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

Abstract

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 near-infrared-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 μJcm−2. The responsivity, which is defined in our research, was R = Δσ/F = 84 × 104 m2/ΩJ. The quantum efficiency Q.E. = N e /N ph  = 3 × 104. These characteristics confirm that TiS3 nanoribbons are a highly desirable material for optoelectronic devices.