Few-layer In_4/3P₂Se₆ nanoflakes for high detectivity photodetectors

Abstract

Metal phosphorus trichalcogenides (MPX3) have attracted extensive attention as promising two-dimensional (2D) layered materials in future electronic and optoelectronic devices. Here, few-layer In4/3P2Se6 nanoflakes have been successfully exfoliated, for the...

2D Indium Phosphorus Sulfide (In2P3S9): An Emerging van der Waals High‐k Dielectrics

“…Figure 1b presents the crystal structure of In 2 P 3 S 9 , which belongs to the monoclinic system and consists of closely packed S atoms with octahedral voids occupied by pairs of P and In atoms within the layer planes. [ 20 ] The layered structure together with the weak vdW interlayer interaction would favor the formation of monolayer structure with thickness of about 6.5 Å. Benefiting from the atomic flat surface and confined‐space of mica, the self‐limited epitaxy approach adopted in this study provides a strong interfacial interaction between substrate and materials, enabling the in‐plane growth of In 2 P 3 S 9 nanoflakes.…”

Lattice Defect Engineering Enables Performance-Enhanced MoS2 Photodetection through a Paraelectric BaTiO3 Dielectric

“…Owing to their excellent optical and electronic properties influenced by their quantum size and confinement effects, two-dimensional (2D) materials have broad promising applications in optoelectronic devices. − One prominent representative in this regard is 2D molybdenum disulfide (MoS 2 ), which is persistent in light detection because it possesses particular features, such as thickness-dependent tunable band structure, atomic-level interface, and high compatibility with large-scale fabrication . The photocurrent ( I ph ) for a photoconductivity detector corresponds to I ph = e (μ n Δ n + μ p Δ p )· A · V / L , where e , μ, Δn ( Δp ), and V are the elementary charge, mobility, light generated free electron (hole) densities, and applied bias voltage, respectively; and A and L are the cross-sectional area and length of the detector, respectively.…”

Photocatalytic co-production of hydrogen gas and N-benzylidenebenzylamine over high-quality 2D layered In4/3P2Se6 nanosheets

“…1g demonstrates the vibrational modes of the [P 2 Se 6 ] 4− group, which are three inplane E g (252, 281, 574 cm −1 ) and three out-of-plane A 1g (268, 377, 478 cm −1 ) phonon modes. 32 Furthermore, X-ray photoelectron spectroscopy (XPS) analysis performed on the In 4/3 P 2 Se 6 nanosheet sample in In 3d, P 2p and Se 3d regions (Fig. S7 †) shows the In 3d 3/2 and In 3d 5/2 peaks at 452.2 eV and 444.6 eV, P 2p 5/2 peak at 131.9 eV and Se 3d 5/2 peak at 53.4 eV in the [P 2 Se 6 ] 4− group.…”

“…Its bandgap (E g ) is then estimated to be 1.94 eV through the Kubelka-Munk equation, which is consistent with the theoretically calculated value of 1.88 eV and reported ones. 32,34 Next, ultraviolet (UPS) analysis and Mott-Schottky measurements were conducted to estimate the positions of the CBM and VBM (Fig. S8 and S9 †).…”