[en] 2D materials have shown great promise for next-generation high-performance photodetectors. However, the performance of photodetectors based on 2D materials is generally limited by the tradeoff between photoresponsivity and photodetectivity. Here, a novel junction field-effect transistor (JFET) photodetector consisting of a PdSe${}_2$ gate and MoS${}_2$ channel is constructed to realize high responsivity and high detectivity through effective modulation of top junction gate and back gate. The JFET exhibits high carrier mobility of 213 cm${}^2$ V${}^{-<!--\; ???\; -->1}$ s${}^{-<!--\; ???\; -->1}$. What is more, the high responsivity of 6 × 10${}^2$ A W${}^{-<!--\; ???\; -->1}$, as well as the high detectivity of 10${}^{11}$ Jones, are achieved simultaneously through the dual-gate modulation. The high performance is attributed to the modulation of the depletion region by the dual-gate, which can effectively suppress the dark current and enhance the photocurrent, thereby realizing high detectivity and responsivity. The JFET photodetector provides a new approach to realize photodetectors with high responsivity and detectivity. (© 2021 Wiley-VCH GmbH)

[en] Platinum disulfide (PtS₂) is a newly emerging 2D material, which possesses relatively high carrier mobility, a widely tunable band gap from 0.25 to 1.6 eV, and ultra-high air stability, showing a potential in electronics and optoelectronics. Here, for the first time, we study the temperature-dependent Raman spectra on PtS₂ with different thicknesses. It was found that with the temperature increase from 80 to 298 K, the ${{\mathrm{A}}_{1\mathrm{g}}}^2$ and ${{\mathrm{E}}_{\mathrm{g}}}^1$ modes of all samples show linear softening. Moreover, the linear softening with temperature of PtS₂ is much smaller than other 2D transition metal dichalcogenides, which could be attributed to the stronger interlayer coupling in PtS₂. Our work gives fundamental temperature-dependent vibrational information of PtS₂, which will be useful in future PtS₂–based electronic devices. (paper)