Abstract
AbstractVan der Waals heterostructures are composed of stacked atomically thin two-dimensional (2D) crystals to provide unprecedented functionalities and novel physics. Franckeite, a naturally occurring van der Waals heterostructure consisting of superimposed SnS2-like and PbS-like layers alternately, shows intriguing potential in versatile optoelectronic applications. Here, we have prepared the few-layer franckeite via liquid-phase exfoliation method and characterized its third-order nonlinearity and ultrafast dynamics experimentally. We have found that the layered franckeite shows low saturable intensity, large modulation depth and picosecond ultrafast response. We have designed the passive photonic diodes based on the layered franckeite/C60cascaded film and suspension configuration and found that the passive photonic diodes exhibit stable nonreciprocal transmission of light. The experimental results show the excellent nonlinear optical performance and ultrafast response of the layered franckeite, which may make inroad for the cost effective and reliable high-performance optoelectronic devices.
Highlights
Van der Waals heterostructures [1,2,3], composed of stacked atomically thin two-dimensional (2D) crystals, exhibit unprecedented physicochemical properties for exploring new physical or chemical phenomena and intriguing applications ranging from solar cell [4, 5], catalysis [6, 7] to artificial intelligence devices [8, 9]
The saturable absorption (SA) characteristics of franckeite were studied through the open aperture (OA) Z-scan experiment, and the nonlinear absorption coefficient of about −1.95 × 10−4 m/W, saturable intensity of 0.18 kW/cm2, and modulation depth of 9.4% were obtained at 1064 nm wavelength
Ultrafast carrier dynamics characteristic with hundred picoseconds makes franckeite have the potential to contribute to the ultrafast optoelectronic devices
Summary
Van der Waals heterostructures (vdWHs) [1,2,3], composed of stacked atomically thin two-dimensional (2D) crystals, exhibit unprecedented physicochemical properties for exploring new physical or chemical phenomena and intriguing applications ranging from solar cell [4, 5], catalysis [6, 7] to artificial intelligence devices [8, 9]. The saturable absorption (SA) characteristics of franckeite were studied through the open aperture (OA) Z-scan experiment, and the nonlinear absorption coefficient of about −1.95 × 10−4 m/W, saturable intensity of 0.18 kW/cm, and modulation depth of 9.4% were obtained at 1064 nm wavelength. This relatively low-threshold saturable intensity and large modulation depth makes photonic diodes more implemented. The TEM and corresponding atomic scale high-resolution TEM were characterized in Figure 1B and C, showing that the observed interdistances of the lattice fringes were found to be 0.33 nm ((100), SnS2-like) and 0.298 nm ((020), PbS-like). We have carried out further research on nonlinear absorption characteristics in the near infrared region to explore its application potential in optoelectronic devices
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