A Universal Strategy for Synthesis of 2d Ternary Transition Metal Phosphorous Chalcogenides.

The two-dimensional (2D) ternary transition metal phosphorous chalcogenides (TMPCs) have attracted extensive research interest due to their widely tunable band gap, rich electronic properties, inherent magnetic and ferroelectric properties. However, the synthesis of TMPCs via chemical vapor deposition (CVD) is still challenging since it is difficult to control reactions among multi-precursors. Here, we propose a subtractive element growth mechanism to controllably synthesize the TMPCs. Based on the growth mechanism, the TMPCs including FePS 3 , FePSe 3 , MnPS 3 , MnPSe 3 , CdPS 3 , CdPSe 3 , In 2 P 3 S 9 and SnPS 3 are achieved successfully and further confirmed by Raman, second harmonic generation (SHG) and scanning transmission electron microscopy (STEM). The typical TMPCs - SnPS 3 shows a strong SHG signal at 1064 nm, with an effective nonlinear susceptibility χ (2) of 8.41×10 -11 m V -1 , which is about 8 times of that in MoS 2 . And the photodetector based on CdPSe 3 exhibits superior detection performances with responsivity of 582 mA/W, high detectivity of 3.19 × 10 11 Jones and fast rise time of 611 μs, which is better than most previously reported TMPCs based photodetectors. These results demonstrate the high quality of TMPCs and promote the exploration of the optical properties of 2D TMPCs for their applications in optoelectronics. This article is protected by copyright. All rights reserved.