Improvements in the Performance of a Visible–NIR Photodetector Using Horizontally Aligned TiS₃ Nanoribbons

Abstract

We report the fabrication and characterization of visible and near-infrared-resistive photodetector using horizontally aligned titanium tri sulfide (TiS 3 ) nanoribbons. The fabrication process employed micro-electromechanical system, photolithography and dielectrophoretic (DEP) methods. The interdigitated electrodes (IDE) fingers were fabricated using photolithography and thin-film metallization techniques onto the Si/SiO 2 substrate, and then TiS 3 nanoribbons were horizontally aligned in between IDE using DEP. The fabricated device was first characterized in absence of light and then, the photodetector-based characteristics were obtained by illuminating it with fiber-coupled laser beam. These characteristics were optimized by varying wavelength and power density of the laser beam. The present photodetector shows a maximum responsivity of 5.22 × 10 2 A/W, quantum efficiency of 6.08 × 10 2 , and detectivity of 1.69 × 10 9 Jones. The switching times, i.e., response and recovery times were found to be 1.53 and 0.74 s, respectively, with 1064 nm wavelength and 3.4 mW/mm 2 power density of the laser beam. Also, the effect of O 2 adsorption on nanoribbons has been studied and it is found that adsorbed O 2 acts as electron acceptor and decreases the conductivity of the photodetector. Experimentally, it is found that the photoresponse of the horizontally aligned TiS 3 nanoribbons is better than that of a randomly oriented TiS 3 nanoribbon-based photodetector. Finally, the performance of the present photodetector was compared to that of the previous ones that were found to outperform the reported ones. The additional advantages of the photodetector include excellent stability and portability from which it may be concluded that TiS 3 nanoribbons can be a promising candidate for application in nanoscale electronic and optoelectronic devices.

Birefringence and Dichroism in Quasi‐1D Transition Metal Trichalcogenides: Direct Experimental Investigation

“…[15,16] MS 3 is considered to have great potential in application of optical and electronic devices because of its unique quasi-1D crystal structure and strong optical anisotropy. [11,[17][18][19][20][21][22] Previous studies have shown that the dichroic ratio of TiS 3 is 4:1 [16] and that of ZrS 3 is 2.55:1. [15] The best excitation energy of the dichromatic ratio generated by photocurrent was 1.00-2.0 eV for TiS 3 and 2.0 to 3.0 eV for ZrS 3 .…”

“…[ 15,16 ] MS 3 is considered to have great potential in application of optical and electronic devices because of its unique quasi‐1D crystal structure and strong optical anisotropy. [ 11,17–22 ]…”

Interface Kinetics Assisted Barrier Removal in Large Area 2D-WS2 Growth to Facilitate Mass Scale Device Production

“…It represents the ability of the detector to capture the weakest signal, which can be mathematically expressed as [71]:…”

“…The ratio of photocurrent to the incident intensity of the laser wavelength λ is defined as photoresponsivity of the photodetector and it can be calculated as [ 71 ]: …”

“…It represents the ability of the detector to capture the weakest signal, which can be mathematically expressed as [ 71 ]: where A represents the effective area of photodetector, and e is the electronic charge.…”