Two-dimensional (2D) tin(II) monosulfide (SnS) with strong structural anisotropy has been proven to be a phosphorene analog. However, difficulty in isolating a very thin layer of SnS poses challenges in practical utilization. Here, we prepare ultrathin SnS via liquid-phase exfoliation. With transmission electron microscopy, we identify the buckled structure of 2D SnS. We employ temperature dependent Raman spectroscopy to elucidate electron–phonon interactions, which reveals a linear phonon shifts. The active Raman modes of ultrathin SnS exhibit higher sensitivity to temperature than other 2D materials. Moreover, we demonstrate strong light-matter interaction in ultrathin SnS using Z-scan and ultrafast spectroscopy. Rich exciton–exciton and coherent exciton–photon interactions arising from many-particle excited effects in ultrathin SnS eventually enhances the nonlinear optical properties. Our findings highlight the prospects for the synthesis of ultrathin anisotropic SnS towards the betterment of thermoelectric and photonic devices.

具有强结构各向异性的二维（2D）单硫化锡（II）（SnS）已被证明是磷类似物。然而，难以分离非常薄的SnS层在实际使用中提出了挑战。在这里，我们通过液相剥离制备超薄SnS。通过透射电子显微镜，我们确定了二维SnS的弯曲结构。我们采用依赖温度的拉曼光谱来阐明电子-声子相互作用，从而揭示线性声子位移。超薄SnS的有源拉曼模式显示出比其他2D材料更高的温度敏感性。此外，我们展示了使用Z扫描和超快光谱在超薄SnS中的强光物质相互作用。超薄SnS中多粒子激发效应产生的丰富的激子-激子和相干的激子-光子相互作用最终增强了非线性光学性质。我们的发现突出了朝着改进热电和光子器件方向合成超薄各向异性SnS的前景。