Ultrafast Polarization Sensitive Photodetector Based on MoS₂/Ta₂Pd₃Se₈ Hybrid Dimensional Heterostructure

Abstract

Van der Waals (vdWs) heterostructures based on low dimensional semiconducting materials offer tremendous opportunities in investigating next generation electronic and optoelectronic devices. Careful design based on combinations of different crystal structures and their band alignment engineering in such architectures are crucial for realizing specialized functionality and preferable performance. Here, a polarized light sensitive photodetector with high efficiency and ultrafast response speed based on hybrid dimensional MoS2/Ta2Pd3Se8 vdWs heterostructure, which is owing to the unilateral depletion region as formed between the n–n junction, is reported. In particular, under ultraviolet light irradiation, the device exhibits a high external quantum efficiency of 970%, and the device shows an ultrafast response speed of 1.3 µs under visible light excitation. Moreover, the 1D Ta2Pd3Se8 crystal introduces a highly anisotropic feature of the heterostructure, so as to realize selective detection to linear polarized light with an anisotropic ratio up to 0.66. This work sheds light on the potential applications of hybrid dimensional vdWs heterostructures, which may provide new insight for exploring high performance photodetectors with advanced functions.

Low-dimensional van der Waals materials for linear-polarization-sensitive photodetection: materials, polarizing strategies and applications

“…By contrast, at 3.11 THz, contrary results are obtained. The linear DRs for 2.52 and 3.11 THz are up to 115 and 47, respectively, far surpassing state-of-the-art photodetectors built of low-symmetry vdWMs [104,122,162,260,261].…”

Observation of Emergent Superconductivity in the Topological Insulator Ta2Pd3Te5 via Pressure Manipulation

“…Group theory analysis predicts the existence of 20A g + 10B 1g + 20B 2g + 10B 3g Raman-active modes in Ta 2 Pd 3 Te 5 . The analogous compound Ta 2 Pd 3 Se 8 possesses the highly anisotropic features of the heterostructure, enabling its selective detection by linear polarized light, 50 and Ta 2 Pd 3 Te 5 also presents distinctive anisotropic attributes. The discussion of observed Raman spectra is focused on the following prominent active phonon vibrations at ambient pressure: the A g 6 mode at ∼156.72 cm −1 , the A g 7 mode at ∼174.59 cm −1 , and the most intense peak A g 8 mode around 198.52 cm −1 (Figure 3b, bottom panel).…”

Facile High-Yield Growth of One-Dimensional van der Waals Ta2Pd3Se8 via Chemical Vapor Transport Using PdCl2 as a Transport Agent

“…Recently, a new quasi-1D van der Waals (vdW) material, namely, Ta 2 Pd 3 Se 8 , has been synthesized . It is expected to be used in future electronic and optoelectronic devices based on vdW materials owing to its excellent bandgap scalabilityfrom bulk to single nanowires. − Therefore, the achievement of higher yields and better crystallization quality with a relatively lower cost is necessary for its widespread application. Although Ta 2 Pd 3 Se 8 nanowires were synthesized in previous studies via the CVT method, they used iodine as a transport agent. − This limited the yield, as Pd could not form stable gaseous iodides that could be efficiently transported …”